1. 25 Jul, 2024 1 commit
    • Oran Agra's avatar
      solve races in replication lpop tests (#13445) · e74550dd
      Oran Agra authored
      * some tests didn't wait for replication offset sync
      * tests that used deferring client, didn't wait for it to get blocked.
      an in some cases, the replication offset sync ended before the deferring
      client finished, so the digest match failed.
      * some tests used deferring clients excessively
      * the tests didn't read the client response
      * the tests didn't close the client (fd leak)
      e74550dd
  2. 22 Jul, 2024 1 commit
    • Oran Agra's avatar
      solve race conditions in tests (#13433) · 447ce11a
      Oran Agra authored
      [exception]: Executing test client: ERR FAILOVER target replica is not
      online.. ERR FAILOVER target replica is not online.
          while executing
      "$node_0 failover to $node_1_host $node_1_port"
          ("uplevel" body line 16)
          invoked from within
      "uplevel 1 $code"
          (procedure "test" line 58)
          invoked from within
      "test {failover command to specific replica works} {
      
      [err]: client evicted due to percentage of maxmemory in
      tests/unit/client-eviction.tcl
      Expected 33622 >= 220200 && 33622 < 440401 (context: type eval line 17
      cmd {assert {$tot_mem >= $n && $tot_mem < $maxmemory_clients_actual}}
      proc ::test)
      447ce11a
  3. 15 Jul, 2024 1 commit
    • Oran Agra's avatar
      solve redis-cli test failures due to local history file (#13419) · 880e147d
      Oran Agra authored
      test failure:
      ```
      [err]: Interactive CLI: should find second search result if user presses ctrl+s in tests/integration/redis-cli.tcl
      Expected '1' to be equal to '0' (context: type eval line 10 cmd {assert_equal 1 [regexp {\(i-search\): \x1B\[0mk\x1B\[1mey\x1B\[0ms one} $result]} proc ::test)
      ```
      
      this test (introduced in #12543) depends on the local history file, so
      it can fail if there's some match there.
      the fix is to use a different history file, and delete it before each
      run.
      880e147d
  4. 09 Jul, 2024 1 commit
    • debing.sun's avatar
      Hide user data from log (#13400) · 69b480cb
      debing.sun authored
      
      
      This PR is based on the commits from PR #11747.
      
      In the event of an assertion failure, hide command arguments from the
      operator.
      
      In some cases, private client information can be voluntarily exposed
      when a redis instance crashes due to an assertion failure.
      This commit prevent וnintentional client info exposure.
      Operators can still access the hidden data, but they must actively
      request it.
      Any of the client info commands remains the unchanged.
      
      ### Config
      Add a new config `hide-user-data-from-log` to turn this feature on and
      off, default off.
      
      ---------
      Co-authored-by: default avatarnaglera <anagler123@gmail.com>
      Co-authored-by: default avatarnaglera <58042354+naglera@users.noreply.github.com>
      69b480cb
  5. 02 Jul, 2024 1 commit
  6. 10 Jun, 2024 1 commit
    • Moti Cohen's avatar
      Reserve 2 bits out of EB_EXPIRE_TIME_MAX for possible future use (#13331) · f01fdc39
      Moti Cohen authored
      Reserve 2 bits out of hash-field expiration time (`EB_EXPIRE_TIME_MAX`)
      for possible future lightweight indexing/categorizing of fields. It can
      be achieved by hacking HFE as follows:
      ```
      HPEXPIREAT key [ 2^47 + USER_INDEX ] FIELDS numfields field [field …]
      ```
      
      Redis will also need to expose kind of `HEXPIRESCAN` and `HEXPIRECOUNT`
      for this idea. Yet to be better defined.
      
      `HFE_MAX_ABS_TIME_MSEC` constraint must be enforced only at API level.
      Internally, the expiration time can be up to `EB_EXPIRE_TIME_MAX` for
      future readiness.
      f01fdc39
  7. 29 May, 2024 1 commit
    • Moti Cohen's avatar
      HFE to support AOF and replicas (#13285) · 33fc0fbf
      Moti Cohen authored
      * For replica sake, rewrite commands `H*EXPIRE*` , `HSETF`, `HGETF` to
      have absolute unix time in msec.
      * On active-expiration of field, propagate HDEL to replica
      (`propagateHashFieldDeletion()`)
      * On lazy-expiration, propagate HDEL to replica (`hashTypeGetValue()`
      now calls `hashTypeDelete()`. It also takes care to call
      `propagateHashFieldDeletion()`).
      * Fix `H*EXPIRE*` command such that if it gets flag `LT` and it doesn’t
      have any expiration on the field then it will considered as valid
      condition.
      
      Note, replicas doesn’t make any active expiration, and should avoid lazy
      expiration. On `hashTypeGetValue()` it doesn't check expiration (As long
      as the master didn’t request to delete the field, it is valid)
      
      TODO: 
      * Attach `dbid` to HASH metadata. See
      [here](https://github.com/redis/redis/pull/13209#discussion_r1593385850
      
      )
      
      ---------
      Co-authored-by: default avatardebing.sun <debing.sun@redis.com>
      33fc0fbf
  8. 22 May, 2024 1 commit
  9. 18 May, 2024 1 commit
  10. 17 May, 2024 1 commit
    • Ronen Kalish's avatar
      Hfe serialization listpack (#13243) · 323be4d6
      Ronen Kalish authored
      Add RDB de/serialization for HFE
      
      This PR adds two new RDB types: `RDB_TYPE_HASH_METADATA` and
      `RDB_TYPE_HASH_LISTPACK_TTL` to save HFE data.
      When the hash RAM encoding is dict, it will be saved in the former, and
      when it is listpack it will be saved in the latter.
      Both formats just add the TTL value for each field after the data that
      was previously saved, i.e HASH_METADATA will save the number of entries
      and, for each entry, key, value and TTL, whereas listpack is saved as a
      blob.
      On read, the usual dict <--> listpack conversion takes place if
      required.
      In addition, when reading a hash that was saved as a dict fields are
      actively expired if expiry is due. Currently this slao holds for
      listpack encoding, but it is supposed to be removed.
      
      TODO:
      Remove active expiry on load when loading from listpack format (unless
      we'll decide to keep it)
      323be4d6
  11. 10 May, 2024 1 commit
    • ClaytonNorthey92's avatar
      Add reverse history search in redis-cli (linenoise) (#12543) · 8a05f009
      ClaytonNorthey92 authored
      added reverse history search to redis-cli, use it with the following:
      
      * CTRL+R : enable search backward mode, and search next one when
      pressing CTRL+R again until reach index 0.
      ```
      127.0.0.1:6379> keys one
      127.0.0.1:6379> keys two
      (reverse-i-search):                   # press CTRL+R
      (reverse-i-search): keys two          # input `keys`
      (reverse-i-search): keys one          # press CTRL+R again
      (reverse-i-search): keys one          # press CTRL+R again, still `keys one` due to reaching index 0
      (i-search): keys two                  # press CTRL+S, enable search forward
      (i-search): keys two                  # press CTRL+S, still `keys one` due to reaching index 1
      ```
      
      * CTRL+S : enable search forward mode, and search next one when pressing
      CTRL+S again until reach index 0.
      ```
      127.0.0.1:6379> keys one
      127.0.0.1:6379> keys two
      (i-search):                       # press CTRL+S
      (i-search): keys one              # input `keys`
      (i-search): keys two              # press CTRL+S again
      (i-search): keys two              # press CTRL+R again, still `keys two` due to reaching index 0
      (reverse-i-search): keys one      # press CTRL+R, enable search backward
      (reverse-i-search): keys one      # press CTRL+S, still `keys one` due to reaching index 1
      ```
      
      * CTRL+G : disable
      ```
      127.0.0.1:6379> keys one
      127.0.0.1:6379> keys two
      (reverse-i-search):                   # press CTRL+R
      (reverse-i-search): keys two          # input `keys`
      127.0.0.1:6379>                       # press CTRL+G
      ```
      
      * CTRL+C : disable
      ```
      127.0.0.1:6379> keys one
      127.0.0.1:6379> keys two
      (reverse-i-search):                   # press CTRL+R
      (reverse-i-search): keys two          # input `keys`
      127.0.0.1:6379>                       # press CTRL+G
      ```
      
      * TAB : use the current search result and exit search mode
      ```
      127.0.0.1:6379> keys one
      127.0.0.1:6379> keys two
      (reverse-i-search):                # press CTRL+R
      (reverse-i-search): keys two       # input `keys`
      127.0.0.1:6379> keys two           # press TAB
      ```
      
      * ENTER : use the current search result and execute the command
      ```
      127.0.0.1:6379> keys one
      127.0.0.1:6379> keys two
      (reverse-i-search):                 # press CTRL+R
      (reverse-i-search): keys two        # input `keys`
      127.0.0.1:6379> keys two            # press ENTER
      (empty array)
      127.0.0.1:6379>
      ```
      
      * any arrow key will disable reverse search
      
      your result will have the search match bolded, you can press enter to
      execute the full result
      
      note: I have _only added this for multi-line mode_, as it seems to be
      forced that way when `repl` is called
      
      Closes: https://github.com/redis/redis/issues/8277
      
      
      
      ---------
      Co-authored-by: default avatarClayton Northey <clayton@knowbl.com>
      Co-authored-by: default avatarViktor Söderqvist <viktor.soderqvist@est.tech>
      Co-authored-by: default avatardebing.sun <debing.sun@redis.com>
      Co-authored-by: default avatarBjorn Svensson <bjorn.a.svensson@est.tech>
      Co-authored-by: default avatarViktor Söderqvist <viktor@zuiderkwast.se>
      8a05f009
  12. 12 Mar, 2024 1 commit
    • Binbin's avatar
      Fix redis-check-aof incorrectly considering data in manifest format as MP-AOF (#12958) · da727ad4
      Binbin authored
      The check in fileIsManifest misjudged the manifest file. For example,
      if resp aof contains "file", it will be considered a manifest file and
      the check will fail:
      ```
      *3
      $3
      set
      $4
      file
      $4
      file
      ```
      
      In #12951, if the preamble aof also contains it, it will also fail.
      Fixes #12951.
      
      the bug was happening if the the word "file" is mentioned
      in the first 1024 lines of the AOF. and now as soon as it finds
      a non-comment line it'll break (if it contains "file" or doesn't)
      da727ad4
  13. 20 Feb, 2024 1 commit
    • Binbin's avatar
      xinfo-stream add minimum to seen-time, skip logreqres in fuzzer (#13056) · ca5cac99
      Binbin authored
      
      
      Recently I saw in CI that reply-schemas-validator fails here:
      ```
      Failed validating 'minimum' in schema[1]['properties']['groups']['items']['properties']['consumers']['items']['properties']['active-time']:
          {'description': 'Last time this consumer was active (successful '
                          'reading/claiming).',
           'minimum': 0,
           'type': 'integer'}
      
      On instance['groups'][0]['consumers'][0]['active-time']:
          -1729380548878722639
      ```
      
      The reason is that in fuzzer, we may restore corrupted active-time,
      which will cause the reply schema CI to fail.
      
      The fuzzer can cause corrupt the state in many places, which will
      bugs that mess up the reply, so we decided to skip logreqres.
      
      Also, seen-time is the same type as active-time, adding the minimum.
      
      ---------
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      ca5cac99
  14. 09 Jan, 2024 1 commit
  15. 23 Nov, 2023 1 commit
    • meiravgri's avatar
      Fix async safety in signal handlers (#12658) · 2e854bcc
      meiravgri authored
      see discussion from after https://github.com/redis/redis/pull/12453 was
      merged
      ----
      This PR replaces signals that are not considered async-signal-safe
      (AS-safe) with safe calls.
      
      #### **1. serverLog() and serverLogFromHandler()**
      `serverLog` uses unsafe calls. It was decided that we will **avoid**
      `serverLog` calls by the signal handlers when:
      * The signal is not fatal, such as SIGALRM. In these cases, we prefer
      using `serverLogFromHandler` which is the safe version of `serverLog`.
      Note they have different prompts:
      `serverLog`: `62220:M 26 Oct 2023 14:39:04.526 # <msg>`
      `serverLogFromHandler`: `62220:signal-handler (1698331136) <msg>`
      * The code was added recently. Calls to `serverLog` by the signal
      handler have been there ever since Redis exists and it hasn't caused
      problems so far. To avoid regression, from now we should use
      `serverLogFromHandler`
      
      #### **2. `snprintf` `fgets` and `strtoul`(base = 16) -------->
      `_safe_snprintf`, `fgets_async_signal_safe`, `string_to_hex`**
      The safe version of `snprintf` was taken from
      [here](https://github.com/twitter/twemcache/blob/8cfc4ca5e76ed936bd3786c8cc43ed47e7778c08/src/mc_util.c#L754)
      
      #### **3. fopen(), fgets(), fclose() --------> open(), read(), close()**
      
      #### **4. opendir(), readdir(), closedir() --------> open(),
      syscall(SYS_getdents64), close()**
      
      #### **5. Threads_mngr sync mechanisms**
      * waiting for the thread to generate stack trace: semaphore -------->
      busy-wait
      * `globals_rw_lock` was removed: as we are not using malloc and the
      semaphore anymore we don't need to protect `ThreadsManager_cleanups`.
      
      #### **6. Stacktraces buffer**
      The initial problem was that we were not able to safely call malloc
      within the signal handler.
      To solve that we created a buffer on the stack of `writeStacktraces` and
      saved it in a global pointer, assuming that under normal circumstances,
      the function `writeStacktraces` would complete before any thread
      attempted to write to it. However, **if threads lag behind, they might
      access this global pointer after it no longer belongs to the
      `writeStacktraces` stack, potentially corrupting memory.**
      To address this, various solutions were discussed
      [here](https://github.com/redis/redis/pull/12658#discussion_r1390442896)
      Eventually, we decided to **create a pipe** at server startup that will
      remain valid as long as the process is alive.
      We chose this solution due to its minimal memory usage, and since
      `write()` and `read()` are atomic operations. It ensures that stack
      traces from different threads won't mix.
      
      **The stacktraces collection process is now as  follows:**
      * Cleaning the pipe to eliminate writes of late threads from previous
      runs.
      * Each thread writes to the pipe its stacktrace
      * Waiting for all the threads to mark completion or until a timeout (2
      sec) is reached
      * Reading from the pipe to print the stacktraces.
      
      #### **7. Changes that were considered and eventually were dropped**
      * replace watchdog timer with a POSIX timer: 
      according to [settimer man](https://linux.die.net/man/2/setitimer)
      
      > POSIX.1-2008 marks getitimer() and setitimer() obsolete, recommending
      the use of the POSIX timers API
      ([timer_gettime](https://linux.die.net/man/2/timer_gettime)(2),
      [timer_settime](https://linux.die.net/man/2/timer_settime)(2), etc.)
      instead.
      
      However, although it is supposed to conform to POSIX std, POSIX timers
      API is not supported on Mac.
      You can take a look here at the Linux implementation:
      
      [here](https://github.com/redis/redis/commit/c7562ee13546e504977372fdf40d33c3f86775a5
      
      )
      To avoid messing up the code, and uncertainty regarding compatibility,
      it was decided to drop it for now.
      
      * avoid using sds (uses malloc) in logConfigDebugInfo
      It was considered to print config info instead of using sds, however
      apparently, `logConfigDebugInfo` does more than just print the sds, so
      it was decided this fix is out of this issue scope.
      
      #### **8. fix Signal mask check**
      The check `signum & sig_mask` intended to indicate whether the signal is
      blocked by the thread was incorrect. Actually, the bit position in the
      signal mask corresponds to the signal number. We fixed this by changing
      the condition to: `sig_mask & (1L << (sig_num - 1))`
      
      #### **9. Unrelated changes**
      both `fork.tcl `and `util.tcl` implemented a function called
      `count_log_message` expecting different parameters. This caused
      confusion when trying to run daily tests with additional test parameters
      to run a specific test.
      The `count_log_message` in `fork.tcl` was removed and the calls were
      replaced with calls to `count_log_message` located in `util.tcl`
      
      ---------
      Co-authored-by: default avatarOzan Tezcan <ozantezcan@gmail.com>
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      2e854bcc
  16. 08 Oct, 2023 1 commit
  17. 03 Oct, 2023 1 commit
  18. 02 Oct, 2023 2 commits
    • meiravgri's avatar
      fix crash in crash-report and other improvements (#12623) · 4ba9e18e
      meiravgri authored
      
      
      ## Crash fix
      ### Current behavior
      We might crash if we fail to collect some of the threads' output. If it exceeds timeout for example.
      
      The threads mngr API guarantees that the output array length will be `tids_len`, however, some
      indices can be NULL, in case it fails to collect some of the threads' outputs.
      
      When we use the threads mngr to collect the threads' stacktraces, we rely on this and skip NULL
      entries. Since the output array was allocated with malloc, instead of NULL, it contained garbage,
      so we got a segmentation fault when trying to read this garbage. (in debug.c:writeStacktraces() )
      
      ### fix
      Allocate the global output array with zcalloc.
      
      ### To reproduce the bug, you'll have to change the code:
      **in threadsmngr:ThreadsManager_runOnThreads():**
      make sure the g_output_array allocation is initialized with garbage and not 0s 
      (add `memset(g_output_array, 2, sizeof(void*) * tids_len);` below the allocation).
      
      Force one of the threads to write to the array:
      add a global var: `static redisAtomic size_t return_now = 0;` 
      add to `invoke_callback()` before writing to the output array:
      ```
          size_t i_return;
          atomicGetIncr(return_now, i_return, 1);
          if(i_return == 1) return;
      ```
      compile, start the server with `--enable-debug-command local` and run `redis-cli debug assert`
      The assertion triggers the the stacktrace collection. 
      Expect to get 2 prints of the stack trace - since we get the segmentation fault after we return from
      the threads mngr, it can be safely triggered again.
      
      ## Added global variables r/w lock in ThreadsManager
      To avoid a situation where the main thread runs `ThreadsManager_cleanups` while threads are still
      invoking the signal handler, we use a r/w lock.
      For cleanups, we will acquire the write lock.
      The threads will acquire the read lock to enable them to write simultaneously.
      If we fail to acquire the read lock, it means cleanups are in progress and we return immediately.
      After acquiring the lock we can safely check that the global output array wasn't nullified and proceed
      to write to it.
      This way we ensure the threads are not modifying the global variables/ trying to write to the output
      array after they were zeroed/nullified/destroyed(the semaphore).
      
      ## other minor logging change
      1. removed logging if the semaphore times out because the threads can still write to the output array
        after this check. Instead, we print the total number of printed stacktraces compared to the exacted
        number (len_tids).
      2. use noinline attribute to make sure the uplevel number of ignored stack trace entries stays correct.
      3. improve testing
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      4ba9e18e
    • YaacovHazan's avatar
      Stabilization and improvements around aof tests (#12626) · 2e0f6724
      YaacovHazan authored
      In some tests, the code manually searches for a log message, and it
      uses tail -1 with a delay of 1 second, which can miss the expected line.
      
      Also, because the aof tests use start_server_aof and not start_server,
      the test name doesn't log into the server log.
      
      To fix the above, I made the following changes:
      - Change the start_server_aof to wrap the start_server.
        This will add the created aof server to the servers list, and make
        srv() and wait_for_log_messages() available for the tests.
      
      - Introduce a new option for start_server.
        'wait_ready' - an option to let the caller start the test code without
        waiting for the server to be ready. useful for tests on a server that
        is expected to exit on startup.
      
      - Create a new start_server_aof_ex.
        The new proc also accept options as argument and make use of the
        new 'short_life' option for tests that are expected to exit on startup
        because of some error in the aof file(s).
      
      Because of the above, I had to change many lines and replace every
      local srv variable (a server config) usage with the srv().
      2e0f6724
  19. 27 Sep, 2023 1 commit
  20. 24 Sep, 2023 1 commit
    • meiravgri's avatar
      Print stack trace from all threads in crash report (#12453) · cc2be639
      meiravgri authored
      In this PR we are adding the functionality to collect all the process's threads' backtraces.
      
      ## Changes made in this PR
      
      ### **introduce threads mngr API**
      The **threads mngr API** which has 2 abilities:
      * `ThreadsManager_init() `- register to SIGUSR2. called on the server start-up.
      * ` ThreadsManager_runOnThreads()` - receives a list of a pid_t and a callback, tells every
        thread in the list to invoke the callback, and returns the output collected by each invocation.
      **Elaborating atomicvar API**
      * `atomicIncrGet(var,newvalue_var,count) `-- Increment and get the atomic counter new value
      * `atomicFlagGetSet` -- Get and set the atomic counter value to 1
      
      ### **Always set SIGALRM handler**
      SIGALRM handler prints the process's stacktrace to the log file. Up until now, it was set only if the
      `server.watchdog_period` > 0. This can be also useful if debugging is needed. However, in situations
      where the server can't get requests, (a deadlock, for example) we weren't able to change the signal handler.
      To make it available at run time we set SIGALRM handler on server startup. The signal handler name was
      changed to a more general `sigalrmSignalHandler`.
      
      ### **Print all the process' threads' stacktraces**
      
      `logStackTrace()` now calls `writeStacktraces()`, instead of logging the current thread stacktrace.
      `writeStacktraces()`:
      * On Linux systems we use the threads manager API to collect the backtraces of all the process' threads.
        To get the `tids` list (threads ids) we read the `/proc/<redis-server-pid>/tasks` file which includes a list of directories.
        Each directory name corresponds to one tid (including the main thread). For each thread, we also need to check if it
        can get the signal from the threads manager (meaning it is not blocking/ignoring that signal). We send the threads
        manager this tids list and `collect_stacktrace_data()` callback, which collects the thread's backtrace addresses,
        its name, and tid.
      * On other systems, the behavior remained as it was (writing only the current thread stacktrace to the log file).
      
      ## compatibility notes
      1. **The threads mngr API is only supported in linux.** 
      2. glibc earlier than 2.3 We use `syscall(SYS_gettid)` and `syscall(SYS_tgkill...)` because their dedicated
        alternatives (`gettid()` and `tgkill`) were added in glibc 2.3.
      
      ## Output example
      
      Each thread backtrace will have the following format:
      `<tid> <thread_name> [additional_info]`
      * **tid**: as read from the `/proc/<redis-server-pid>/tasks` file
      * **thread_name**: the tread name as it is registered in the os/
      * **additional_info**: Sometimes we want to add specific information about one of the threads. currently.
        it is only used to mark the thread that handles the backtraces collection by adding "*".
        In case of crash - this also indicates which thread caused the crash. The handling thread in won't
        necessarily appear first.
      
      ```
      ------ STACK TRACE ------
      EIP:
      /lib/aarch64-linux-gnu/libc.so.6(epoll_pwait+0x9c)[0xffffb9295ebc]
      
      67089 redis-server *
      linux-vdso.so.1(__kernel_rt_sigreturn+0x0)[0xffffb9437790]
      /lib/aarch64-linux-gnu/libc.so.6(epoll_pwait+0x9c)[0xffffb9295ebc]
      redis-server *:6379(+0x75e0c)[0xaaaac2fe5e0c]
      redis-server *:6379(aeProcessEvents+0x18c)[0xaaaac2fe6c00]
      redis-server *:6379(aeMain+0x24)[0xaaaac2fe7038]
      redis-server *:6379(main+0xe0c)[0xaaaac3001afc]
      /lib/aarch64-linux-gnu/libc.so.6(+0x273fc)[0xffffb91d73fc]
      /lib/aarch64-linux-gnu/libc.so.6(__libc_start_main+0x98)[0xffffb91d74cc]
      redis-server *:6379(_start+0x30)[0xaaaac2fe0370]
      
      67093 bio_lazy_free
      /lib/aarch64-linux-gnu/libc.so.6(+0x79dfc)[0xffffb9229dfc]
      /lib/aarch64-linux-gnu/libc.so.6(pthread_cond_wait+0x208)[0xffffb922c8fc]
      redis-server *:6379(bioProcessBackgroundJobs+0x174)[0xaaaac30976e8]
      /lib/aarch64-linux-gnu/libc.so.6(+0x7d5c8)[0xffffb922d5c8]
      /lib/aarch64-linux-gnu/libc.so.6(+0xe5d1c)[0xffffb9295d1c]
      
      67091 bio_close_file
      /lib/aarch64-linux-gnu/libc.so.6(+0x79dfc)[0xffffb9229dfc]
      /lib/aarch64-linux-gnu/libc.so.6(pthread_cond_wait+0x208)[0xffffb922c8fc]
      redis-server *:6379(bioProcessBackgroundJobs+0x174)[0xaaaac30976e8]
      /lib/aarch64-linux-gnu/libc.so.6(+0x7d5c8)[0xffffb922d5c8]
      /lib/aarch64-linux-gnu/libc.so.6(+0xe5d1c)[0xffffb9295d1c]
      
      67092 bio_aof
      /lib/aarch64-linux-gnu/libc.so.6(+0x79dfc)[0xffffb9229dfc]
      /lib/aarch64-linux-gnu/libc.so.6(pthread_cond_wait+0x208)[0xffffb922c8fc]
      redis-server *:6379(bioProcessBackgroundJobs+0x174)[0xaaaac30976e8]
      /lib/aarch64-linux-gnu/libc.so.6(+0x7d5c8)[0xffffb922d5c8]
      /lib/aarch64-linux-gnu/libc.so.6(+0xe5d1c)[0xffffb9295d1c]
      67089:signal-handler (1693824528) --------
      ```
      cc2be639
  21. 02 Sep, 2023 1 commit
    • alonre24's avatar
      redis-benchmark - add the support for binary strings (#9414) · 044e29dd
      alonre24 authored
      
      
      Recently, the option of sending an argument from stdin using `-x` flag
      was added to redis-benchmark (this option is available in redis-cli as well).
      However, using the `-x` option for sending a blobs that contains null-characters
      doesn't work as expected - the argument is trimmed in the first occurrence of
      `\X00` (unlike in redis-cli).  
      This PR aims to fix this issue and add the support for every binary string input,
      by sending arguments length to `redisFormatCommandArgv` when processing
      redis-benchmark command, so we won't treat the arguments as C-strings.
      
      Additionally, we add a simple test coverage for `-x` (without binary strings, and
      also remove an excessive server started in tests, and make sure to select db 0
      so that `r` and the benchmark work on the same db.
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      044e29dd
  22. 16 Aug, 2023 1 commit
  23. 12 Jun, 2023 1 commit
  24. 22 May, 2023 1 commit
    • binfeng-xin's avatar
      optimize spopwithcount propagation (#12082) · 38e284f1
      binfeng-xin authored
      
      
      A single SPOP with command with count argument resulted in many SPOP
      commands being propagated to the replica.
      This is inefficient because the key name is repeated many times, and is also
      being looked-up many times.
      also it results in high QPS metrics on the replica.
      To solve that, we flush batches of 1024 fields per SPOP command.
      Co-authored-by: default avatarzhaozhao.zz <zhaozhao.zz@alibaba-inc.com>
      38e284f1
  25. 06 May, 2023 1 commit
    • zhaozhao.zz's avatar
      Free backlog only if rsi is invalid when master reboot (#12088) · b0dd7b32
      zhaozhao.zz authored
      When master reboot from RDB, if rsi in RDB is valid we should not free replication backlog, even if master_repl_offset or repl-offset is 0.
      
      Since if master doesn't send any data to replicas master_repl_offset is 0, it's a valid number.
      
      A clear example:
      
      1. start a master and apply some write commands, the master's master_repl_offset is 0 since it has no replicas.
      2. stop write commands on master, and start another instance and replicaof the master, trigger an FULLRESYNC
      3. the master's master_repl_offset is still 0 (set a large number for repl-ping-replica-period), do BGSAVE and restart the master
      4. master load master_repl_offset from RDB's rsi and it's still 0, and we should make sure replica can partially resync with master.
      b0dd7b32
  26. 18 Apr, 2023 1 commit
  27. 12 Apr, 2023 1 commit
    • Oran Agra's avatar
      Attempt to solve MacOS CI issues in GH Actions (#12013) · 997fa41e
      Oran Agra authored
      The MacOS CI in github actions often hangs without any logs. GH argues that
      it's due to resource utilization, either running out of disk space, memory, or CPU
      starvation, and thus the runner is terminated.
      
      This PR contains multiple attempts to resolve this:
      1. introducing pause_process instead of SIGSTOP, which waits for the process
        to stop before resuming the test, possibly resolving race conditions in some tests,
        this was a suspect since there was one test that could result in an infinite loop in that
       case, in practice this didn't help, but still a good idea to keep.
      2. disable the `save` config in many tests that don't need it, specifically ones that use
        heavy writes and could create large files.
      3. change the `populate` proc to use short pipeline rather than an infinite one.
      4. use `--clients 1` in the macos CI so that we don't risk running multiple resource
        demanding tests in parallel.
      5. enable `--verbose` to be repeated to elevate verbosity and print more info to stdout
        when a test or a server starts.
      997fa41e
  28. 30 Mar, 2023 1 commit
    • Jason Elbaum's avatar
      Reimplement cli hints based on command arg docs (#10515) · 1f76bb17
      Jason Elbaum authored
      
      
      Now that the command argument specs are available at runtime (#9656), this PR addresses
      #8084 by implementing a complete solution for command-line hinting in `redis-cli`.
      
      It correctly handles nearly every case in Redis's complex command argument definitions, including
      `BLOCK` and `ONEOF` arguments, reordering of optional arguments, and repeated arguments
      (even when followed by mandatory arguments). It also validates numerically-typed arguments.
      It may not correctly handle all possible combinations of those, but overall it is quite robust.
      
      Arguments are only matched after the space bar is typed, so partial word matching is not
      supported - that proved to be more confusing than helpful. When the user's current input
      cannot be matched against the argument specs, hinting is disabled.
      
      Partial support has been implemented for legacy (pre-7.0) servers that do not support
      `COMMAND DOCS`, by falling back to a statically-compiled command argument table.
      On startup, if the server does not support `COMMAND DOCS`, `redis-cli` will now issue
      an `INFO SERVER` command to retrieve the server version (unless `HELLO` has already
      been sent, in which case the server version will be extracted from the reply to `HELLO`).
      The server version will be used to filter the commands and arguments in the command table,
      removing those not supported by that version of the server. However, the static table only
      includes core Redis commands, so with a legacy server hinting will not be supported for
      module commands. The auto generated help.h and the scripts that generates it are gone.
      
      Command and argument tables for the server and CLI use different structs, due primarily
      to the need to support different runtime data. In order to generate code for both, macros
      have been added to `commands.def` (previously `commands.c`) to make it possible to
      configure the code generation differently for different use cases (one linked with redis-server,
      and one with redis-cli).
      
      Also adding a basic testing framework for the command hints based on new (undocumented)
      command line options to `redis-cli`: `--test_hint 'INPUT'` prints out the command-line hint for
      a given input string, and `--test_hint_file <filename>` runs a suite of test cases for the hinting
      mechanism. The test suite is in `tests/assets/test_cli_hint_suite.txt`, and it is run from
      `tests/integration/redis-cli.tcl`.
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      Co-authored-by: default avatarViktor Söderqvist <viktor.soderqvist@est.tech>
      1f76bb17
  29. 20 Mar, 2023 1 commit
    • Binbin's avatar
      Fix new subscribe mode test in reply-schemas-validator (#11939) · c9124145
      Binbin authored
      The reason is in reply-schemas-validator, the resp of the
      client we create will be client_default_resp (currently 3):
      ```
      client *createClient(connection *conn) {
          client *c = zmalloc(sizeof(client));
       #ifdef LOG_REQ_RES
          reqresReset(c, 0);
          c->resp = server.client_default_resp;
       #else
          c->resp = 2;
       #endif
      }
      ```
      
      But current_resp3 in redis-cli will be inconsistent with it,
      the test adds a simple hello 3 to avoid this failure, test
      was added in #11873.
      
      Added help descriptions for dont-pre-clean option, it was
      added in #10273
      c9124145
  30. 19 Mar, 2023 1 commit
    • Viktor Söderqvist's avatar
      redis-cli: Accept commands in subscribed mode (#11873) · bbf364a4
      Viktor Söderqvist authored
      The message "Reading messages... (press Ctrl-C to quit)" is replaced by
      "Reading messages... (press Ctrl-C to quit or any key to type command)".
      
      This allows users to subscribe to more channels, to try out UNSUBSCRIBE and to
      combine pubsub with other features such as push messages from client tracking.
      
      The "Reading messages" info message is displayed in the bottom of the output in a
      distinct style and moves downward as more messages appear. When any key is pressed,
      the info message is replaced by the prompt with for entering commands.
      After entering a command and the reply is displayed, the "Reading messages" info
      messages appears again. This is added to the repl loop in redis-cli and in the
      corresponding place for non-interactive mode.
      
      An indication "(subscribed mode)" is included in the prompt when entering commands
      in subscribed mode.
      
      Also:
      * Fixes a problem that UNSUBSCRIBE hanged when used with RESP3 and push callback,
        without first entering subscribe mode. It hanged because UNSUBSCRIBE gets one or
        more push replies but no in-band reply.
      * Exit subscribed mode after RESET.
      bbf364a4
  31. 13 Mar, 2023 1 commit
    • Binbin's avatar
      Fix tail->repl_offset update in feedReplicationBuffer (#11905) · 7997874f
      Binbin authored
      
      
      In #11666, we added a while loop and will split a big reply
      node to multiple nodes. The update of tail->repl_offset may
      be wrong. Like before #11666, we would have created at most
      one new reply node, and now we will create multiple nodes if
      it is a big reply node.
      
      Now we are creating more than one node, and the tail->repl_offset
      of all the nodes except the last one are incorrect. Because we
      update master_repl_offset at the beginning, and then use it to
      update the tail->repl_offset. This would have lead to an assertion
      during PSYNC, a test was added to validate that case.
      
      Besides that, the calculation of size was adjusted to fix
      tests that failed due to a combination of a very low backlog size,
      and some thresholds of that get violated because of the relatively
      high overhead of replBufBlock. So now if the backlog size / 16 is too
      small, we'll take PROTO_REPLY_CHUNK_BYTES instead.
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      7997874f
  32. 12 Mar, 2023 1 commit
    • xbasel's avatar
      Large blocks of replica client output buffer could lead to psync loops and... · 7be7834e
      xbasel authored
      
      Large blocks of replica client output buffer could lead to psync loops and unnecessary memory usage (#11666)
      
      This can happen when a key almost equal or larger than the
      client output buffer limit of the replica is written.
      
      Example:
      1. DB is empty
      2. Backlog size is 1 MB
      3. Client out put buffer limit is 2 MB
      4. Client writes a 3 MB key
      5. The shared replication buffer will have a single node which contains
      the key written above, and it exceeds the backlog size.
      
      At this point the client output buffer usage calculation will report the
      replica buffer to be 3 MB (or more) even after sending all the data to
      the replica.
      The primary drops the replica connection for exceeding the limits,
      the replica reconnects and successfully executes partial sync but the
      primary will drop the connection again because the buffer usage is still
      3 MB. This happens over and over.
      
      To mitigate the problem, this fix limits the maximum size of a single
      backlog node to be (repl_backlog_size/16). This way a single node can't
      exceed the limits of the COB (the COB has to be larger than the
      backlog).
      It also means that if the backlog has some excessive data it can't trim,
      it would be at most about 6% overuse.
      
      other notes:
      1. a loop was added in feedReplicationBuffer which caused a massive LOC
        change due to indentation, the actual changes are just the `min(max` and the loop.
      3. an unrelated change in an existing test to speed up a server termination which took 10 seconds.
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      7be7834e
  33. 11 Mar, 2023 1 commit
    • guybe7's avatar
      Add reply_schema to command json files (internal for now) (#10273) · 4ba47d2d
      guybe7 authored
      Work in progress towards implementing a reply schema as part of COMMAND DOCS, see #9845
      Since ironing the details of the reply schema of each and every command can take a long time, we
      would like to merge this PR when the infrastructure is ready, and let this mature in the unstable branch.
      Meanwhile the changes of this PR are internal, they are part of the repo, but do not affect the produced build.
      
      ### Background
      In #9656 we add a lot of information about Redis commands, but we are missing information about the replies
      
      ### Motivation
      1. Documentation. This is the primary goal.
      2. It should be possible, based on the output of COMMAND, to be able to generate client code in typed
        languages. In order to do that, we need Redis to tell us, in detail, what each reply looks like.
      3. We would like to build a fuzzer that verifies the reply structure (for now we use the existing
        testsuite, see the "Testing" section)
      
      ### Schema
      The idea is to supply some sort of schema for the various replies of each command.
      The schema will describe the conceptual structure of the reply (for generated clients), as defined in RESP3.
      Note that the reply structure itself may change, depending on the arguments (e.g. `XINFO STREAM`, with
      and without the `FULL` modifier)
      We decided to use the standard json-schema (see https://json-schema.org/) as the reply-schema.
      
      Example for `BZPOPMIN`:
      ```
      "reply_schema": {
          "oneOf": [
              {
                  "description": "Timeout reached and no elements were popped.",
                  "type": "null"
              },
              {
                  "description": "The keyname, popped member, and its score.",
                  "type": "array",
                  "minItems": 3,
                  "maxItems": 3,
                  "items": [
                      {
                          "description": "Keyname",
                          "type": "string"
                      },
                      {
                          "description": "Member",
                          "type": "string"
                      },
                      {
                          "description": "Score",
                          "type": "number"
                      }
                  ]
              }
          ]
      }
      ```
      
      #### Notes
      1.  It is ok that some commands' reply structure depends on the arguments and it's the caller's responsibility
        to know which is the relevant one. this comes after looking at other request-reply systems like OpenAPI,
        where the reply schema can also be oneOf and the caller is responsible to know which schema is the relevant one.
      2. The reply schemas will describe RESP3 replies only. even though RESP3 is structured, we want to use reply
        schema for documentation (and possibly to create a fuzzer that validates the replies)
      3. For documentation, the description field will include an explanation of the scenario in which the reply is sent,
        including any relation to arguments. for example, for `ZRANGE`'s two schemas we will need to state that one
        is with `WITHSCORES` and the other is without.
      4. For documentation, there will be another optional field "notes" in which we will add a short description of
        the representation in RESP2, in case it's not trivial (RESP3's `ZRANGE`'s nested array vs. RESP2's flat
        array, for example)
      
      Given the above:
      1. We can generate the "return" section of all commands in [redis-doc](https://redis.io/commands/)
        (given that "description" and "notes" are comprehensive enough)
      2. We can generate a client in a strongly typed language (but the return type could be a conceptual
        `union` and the caller needs to know which schema is relevant). see the section below for RESP2 support.
      3. We can create a fuzzer for RESP3.
      
      ### Limitations (because we are using the standard json-schema)
      The problem is that Redis' replies are more diverse than what the json format allows. This means that,
      when we convert the reply to a json (in order to validate the schema against it), we lose information (see
      the "Testing" section below).
      The other option would have been to extend the standard json-schema (and json format) to include stuff
      like sets, bulk-strings, error-string, etc. but that would mean also extending the schema-validator - and that
      seemed like too much work, so we decided to compromise.
      
      Examples:
      1. We cannot tell the difference between an "array" and a "set"
      2. We cannot tell the difference between simple-string and bulk-string
      3. we cannot verify true uniqueness of items in commands like ZRANGE: json-schema doesn't cover the
        case of two identical members with different scores (e.g. `[["m1",6],["m1",7]]`) because `uniqueItems`
        compares (member,score) tuples and not just the member name. 
      
      ### Testing
      This commit includes some changes inside Redis in order to verify the schemas (existing and future ones)
      are indeed correct (i.e. describe the actual response of Redis).
      To do that, we added a debugging feature to Redis that causes it to produce a log of all the commands
      it executed and their replies.
      For that, Redis needs to be compiled with `-DLOG_REQ_RES` and run with
      `--reg-res-logfile <file> --client-default-resp 3` (the testsuite already does that if you run it with
      `--log-req-res --force-resp3`)
      You should run the testsuite with the above args (and `--dont-clean`) in order to make Redis generate
      `.reqres` files (same dir as the `stdout` files) which contain request-response pairs.
      These files are later on processed by `./utils/req-res-log-validator.py` which does:
      1. Goes over req-res files, generated by redis-servers, spawned by the testsuite (see logreqres.c)
      2. For each request-response pair, it validates the response against the request's reply_schema
        (obtained from the extended COMMAND DOCS)
      5. In order to get good coverage of the Redis commands, and all their different replies, we chose to use
        the existing redis test suite, rather than attempt to write a fuzzer.
      
      #### Notes about RESP2
      1. We will not be able to use the testing tool to verify RESP2 replies (we are ok with that, it's time to
        accept RESP3 as the future RESP)
      2. Since the majority of the test suite is using RESP2, and we want the server to reply with RESP3
        so that we can validate it, we will need to know how to convert the actual reply to the one expected.
         - number and boolean are always strings in RESP2 so the conversion is easy
         - objects (maps) are always a flat array in RESP2
         - others (nested array in RESP3's `ZRANGE` and others) will need some special per-command
           handling (so the client will not be totally auto-generated)
      
      Example for ZRANGE:
      ```
      "reply_schema": {
          "anyOf": [
              {
                  "description": "A list of member elements",
                  "type": "array",
                  "uniqueItems": true,
                  "items": {
                      "type": "string"
                  }
              },
              {
                  "description": "Members and their scores. Returned in case `WITHSCORES` was used.",
                  "notes": "In RESP2 this is returned as a flat array",
                  "type": "array",
                  "uniqueItems": true,
                  "items": {
                      "type": "array",
                      "minItems": 2,
                      "maxItems": 2,
                      "items": [
                          {
                              "description": "Member",
                              "type": "string"
                          },
                          {
                              "description": "Score",
                              "type": "number"
                          }
                      ]
                  }
              }
          ]
      }
      ```
      
      ### Other changes
      1. Some tests that behave differently depending on the RESP are now being tested for both RESP,
        regardless of the special log-req-res mode ("Pub/Sub PING" for example)
      2. Update the history field of CLIENT LIST
      3. Added basic tests for commands that were not covered at all by the testsuite
      
      ### TODO
      
      - [x] (maybe a different PR) add a "condition" field to anyOf/oneOf schemas that refers to args. e.g.
        when `SET` return NULL, the condition is `arguments.get||arguments.condition`, for `OK` the condition
        is `!arguments.get`, and for `string` the condition is `arguments.get` - https://github.com/redis/redis/issues/11896
      - [x] (maybe a different PR) also run `runtest-cluster` in the req-res logging mode
      - [x] add the new tests to GH actions (i.e. compile with `-DLOG_REQ_RES`, run the tests, and run the validator)
      - [x] (maybe a different PR) figure out a way to warn about (sub)schemas that are uncovered by the output
        of the tests - https://github.com/redis/redis/issues/11897
      - [x] (probably a separate PR) add all missing schemas
      - [x] check why "SDOWN is triggered by misconfigured instance replying with errors" fails with --log-req-res
      - [x] move the response transformers to their own file (run both regular, cluster, and sentinel tests - need to
        fight with the tcl including mechanism a bit)
      - [x] issue: module API - https://github.com/redis/redis/issues/11898
      - [x] (probably a separate PR): improve schemas: add `required` to `object`s - https://github.com/redis/redis/issues/11899
      
      Co-authored-by: default avatarOzan Tezcan <ozantezcan@gmail.com>
      Co-authored-by: default avatarHanna Fadida <hanna.fadida@redislabs.com>
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      Co-authored-by: default avatarShaya Potter <shaya@redislabs.com>
      4ba47d2d
  34. 16 Feb, 2023 1 commit
    • Oran Agra's avatar
      Cleanup around script_caller, fix tracking of scripts and ACL logging for RM_Call (#11770) · 233abbbe
      Oran Agra authored
      * Make it clear that current_client is the root client that was called by
        external connection
      * add executing_client which is the client that runs the current command
        (can be a module or a script)
      * Remove script_caller that was used for commands that have CLIENT_SCRIPT
        to get the client that called the script. in most cases, that's the current_client,
        and in others (when being called from a module), it could be an intermediate
        client when we actually want the original one used by the external connection.
      
      bugfixes:
      * RM_Call with C flag should log ACL errors with the requested user rather than
        the one used by the original client, this also solves a crash when RM_Call is used
        with C flag from a detached thread safe context.
      * addACLLogEntry would have logged info about the script_caller, but in case the
        script was issued by a module command we actually want the current_client. the
        exception is when RM_Call is called from a timer event, in which case we don't
        have a current_client.
      
      behavior changes:
      * client side tracking for scripts now tracks the keys that are read by the script
        instead of the keys that are declared by the caller for EVAL
      
      other changes:
      * Log both current_client and executing_client in the crash log.
      * remove prepareLuaClient and resetLuaClient, being dead code that was forgotten.
      * remove scriptTimeSnapshot and snapshot_time and instead add cmd_time_snapshot
        that serves all commands and is reset only when execution nesting starts.
      * remove code to propagate CLIENT_FORCE_REPL from the executed command
        to the script caller since scripts aren't propagated anyway these days and anyway
        this flag wouldn't have had an effect since CLIENT_PREVENT_PROP is added by scriptResetRun.
      * fix a module GIL violation issue in afterSleep that was introduced in #10300 (unreleased)
      233abbbe
  35. 06 Feb, 2023 1 commit
  36. 03 Feb, 2023 1 commit
    • Binbin's avatar
      Fix unstable test: replication with parallel clients writing in different DBs (#11782) · 03347d04
      Binbin authored
      Failure happens in FreeBSD daily:
      ```
      *** [err]: Test replication with parallel clients writing in different DBs in tests/integration/replication-4.tcl
      Expected [::redis::redisHandle2 dbsize] > 0 (context: type eval line 19 cmd {assert {[$master dbsize] > 0}} proc ::test)
      ```
      
      The test is failing because db 9 has no data (default db), and
      according to the log, we can see that db 9 does not have a key:
      ```
       ### Starting test Test replication with parallel clients writing in different DBs in tests/integration/replication-4.tcl
      3338:S 03 Feb 2023 00:15:18.723 - DB 11: 1 keys (0 volatile) in 4 slots HT.
      3338:S 03 Feb 2023 00:15:18.723 - DB 12: 141 keys (0 volatile) in 256 slots HT.
      ```
      
      We use `wait_for_condition` to ensure that parallel clients have
      written data before calling stop_bg_complex_data. At the same time,
      `wait_for_condition` is also used to remove the above `after 1000`,
      which can save time in most cases.
      03347d04
  37. 01 Feb, 2023 1 commit
    • Binbin's avatar
      Fix handshake timeout replication test race (#11773) · ffb691f6
      Binbin authored
      Test on x86 + TLS fail with this error:
      ```
      *** [err]: Slave is able to detect timeout during handshake in tests/integration/replication.tcl
      Replica is not able to detect timeout
      ```
      
      The replica logs is:
      ```
       ### Starting test Slave is able to detect timeout during handshake in tests/integration/replication.tcl
      7681:S 05 Jan 2023 00:21:56.635 * Non blocking connect for SYNC fired the event.
      7681:S 05 Jan 2023 00:21:56.638 * Master replied to PING, replication can continue...
      7681:S 05 Jan 2023 00:21:56.638 * Trying a partial resynchronization (request ef70638885500aad12dd673c68ca1541116a59fe:1).
      7681:S 05 Jan 2023 00:22:56.894 # Failed to read response from the server: error:0A000126:SSL routines::unexpected eof while reading
      7681:S 05 Jan 2023 00:22:56.894 # Master did not reply to PSYNC, will try later
      ```
      
      This is another issue that appeared after #11640 was merged. This PR try to fix it.
      The idea is to make it stable in `wait_bgsave`, for example, it may wait until the
      next psync retry in the following situation: `Master did not reply to PSYNC, will try later`
      
      Other than that, the change will make the test more consistent / predictable since
      it'll mean the master is always frozen in the desired state (waiting for repl-diskless-sync-delay
      to happen, rather than earlier stages of the handshake).
      ffb691f6
  38. 04 Jan, 2023 1 commit
    • Oran Agra's avatar
      fix handshake timeout replication test race (#11640) · 0ecf6cdc
      Oran Agra authored
      Test on ARM + TLS often fail with this error:
      ```
      *** [err]: Slave is able to detect timeout during handshake in tests/integration/replication.tcl
      Replica is not able to detect timeout
      ```
      https://github.com/redis/redis-extra-ci/actions/runs/3727554226/jobs/6321797837
      
      The replica logs show that in this case the replica got timeout before even getting a response to the PING command (instead of the SYNC command).
      
      it should have shown these:
      ```
      * MASTER <-> REPLICA sync started
      * REPLICAOF 127.0.0.1:22112 enabled ....
      ### Starting test Slave enters handshake in tests/integration/replication.tcl
      * Non blocking connect for SYNC fired the event.
      ```
      then:
      ```
      * Master replied to PING, replication can continue...
      * Trying a partial resynchronization (request 50da9eff70d774f4e6cb723eb4b091440f215772:1).
      ```
      and then hang for 5 seconds:
      ```
      # Timeout connecting to the MASTER...
      * Reconnecting to MASTER 127.0.0.1:21112 after failure
      ```
      
      but instead it got this (looks like it disconnected too early, and then tried to re-connect):
      ```
      10890:M 19 Dec 2022 01:32:54.794 * Ready to accept connections tls
      10890:M 19 Dec 2022 01:32:54.809 - Accepted 127.0.0.1:41047
      10890:M 19 Dec 2022 01:32:54.878 - Reading from client: error:0A000126:SSL routines::unexpected eof while reading
      10890:M 19 Dec 2022 01:32:54.925 - Accepted 127.0.0.1:39207
      10890:S 19 Dec 2022 01:32:55.463 * Before turning into a replica, using my own master parameters to synthesize a cached master: I may be able to synchronize with the new master with just a partial transfer.
      10890:S 19 Dec 2022 01:32:55.463 * Connecting to MASTER 127.0.0.1:24126
      10890:S 19 Dec 2022 01:32:55.463 * MASTER <-> REPLICA sync started
      10890:S 19 Dec 2022 01:32:55.463 * REPLICAOF 127.0.0.1:24126 enabled (user request from 'id=4 addr=127.0.0.1:39207 laddr=127.0.0.1:24125 fd=8 name= age=1 idle=0 flags=N db=9 sub=0 psub=0 ssub=0 multi=-1 qbuf=43 qbuf-free=20431 argv-mem=21 multi-mem=0 rbs=1024 rbp=5 obl=0 oll=0 omem=0 tot-mem=22317 events=r cmd=slaveof user=default redir=-1 resp=2')
      ### Starting test Slave enters handshake in tests/integration/replication.tcl
      10890:S 19 Dec 2022 01:32:55.476 * Non blocking connect for SYNC fired the event.
      10890:S 19 Dec 2022 01:33:00.701 # Failed to read response from the server: (null)         <- note this!!
      10890:S 19 Dec 2022 01:33:00.701 # Master did not respond to command during SYNC handshake
      10890:S 19 Dec 2022 01:33:01.002 * Connecting to MASTER 127.0.0.1:24126
      10890:S 19 Dec 2022 01:33:01.002 * MASTER <-> REPLICA sync started
      ### Starting test Slave is able to detect timeout during handshake in tests/integration/replication.tcl
      10890:S 19 Dec 2022 01:33:05.497 * Non blocking connect for SYNC fired the event.
      10890:S 19 Dec 2022 01:33:05.500 * Master replied to PING, replication can continue...
      10890:S 19 Dec 2022 01:33:05.510 * Trying a partial resynchronization (request 947e1956372a0e6c819cfec51c42cc7979b0c221:1).
      10890:S 19 Dec 2022 01:34:05.833 # Failed to read response from the server: error:0A000126:SSL routines::unexpected eof while reading
      10890:S 19 Dec 2022 01:34:05.833 # Master did not reply to PSYNC, will try later
      ```
      
      This PR sets enables the 5 seconds timeout at a later stage to try and prevent the early disconnection.
      0ecf6cdc
  39. 01 Jan, 2023 1 commit
    • ranshid's avatar
      reprocess command when client is unblocked on keys (#11012) · 383d902c
      ranshid authored
      *TL;DR*
      ---------------------------------------
      Following the discussion over the issue [#7551](https://github.com/redis/redis/issues/7551
      
      )
      We decided to refactor the client blocking code to eliminate some of the code duplications
      and to rebuild the infrastructure better for future key blocking cases.
      
      
      *In this PR*
      ---------------------------------------
      1. reprocess the command once a client becomes unblocked on key (instead of running
         custom code for the unblocked path that's different than the one that would have run if
         blocking wasn't needed)
      2. eliminate some (now) irrelevant code for handling unblocking lists/zsets/streams etc...
      3. modify some tests to intercept the error in cases of error on reprocess after unblock (see
         details in the notes section below)
      4. replace '$' on the client argv with current stream id. Since once we reprocess the stream
         XREAD we need to read from the last msg and not wait for new msg  in order to prevent
         endless block loop. 
      5. Added statistics to the info "Clients" section to report the:
         * `total_blocking_keys` - number of blocking keys
         * `total_blocking_keys_on_nokey` - number of blocking keys which have at least 1 client
            which would like
         to be unblocked on when the key is deleted.
      6. Avoid expiring unblocked key during unblock. Previously we used to lookup the unblocked key
         which might have been expired during the lookup. Now we lookup the key using NOTOUCH and
         NOEXPIRE to avoid deleting it at this point, so propagating commands in blocked.c is no longer needed.
      7. deprecated command flags. We decided to remove the CMD_CALL_STATS and CMD_CALL_SLOWLOG
         and make an explicit verification in the call() function in order to decide if stats update should take place.
         This should simplify the logic and also mitigate existing issues: for example module calls which are
         triggered as part of AOF loading might still report stats even though they are called during AOF loading.
      
      *Behavior changes*
      ---------------------------------------------------
      
      1. As this implementation prevents writing dedicated code handling unblocked streams/lists/zsets,
      since we now re-process the command once the client is unblocked some errors will be reported differently.
      The old implementation used to issue
      ``UNBLOCKED the stream key no longer exists``
      in the following cases:
         - The stream key has been deleted (ie. calling DEL)
         - The stream and group existed but the key type was changed by overriding it (ie. with set command)
         - The key not longer exists after we swapdb with a db which does not contains this key
         - After swapdb when the new db has this key but with different type.
         
      In the new implementation the reported errors will be the same as if the command was processed after effect:
      **NOGROUP** - in case key no longer exists, or **WRONGTYPE** in case the key was overridden with a different type.
      
      2. Reprocessing the command means that some checks will be reevaluated once the
      client is unblocked.
      For example, ACL rules might change since the command originally was executed and
      will fail once the client is unblocked.
      Another example is OOM condition checks which might enable the command to run and
      block but fail the command reprocess once the client is unblocked.
      
      3. One of the changes in this PR is that no command stats are being updated once the
      command is blocked (all stats will be updated once the client is unblocked). This implies
      that when we have many clients blocked, users will no longer be able to get that information
      from the command stats. However the information can still be gathered from the client list.
      
      **Client blocking**
      ---------------------------------------------------
      
      the blocking on key will still be triggered the same way as it is done today.
      in order to block the current client on list of keys, the call to
      blockForKeys will still need to be made which will perform the same as it is today:
      
      *  add the client to the list of blocked clients on each key
      *  keep the key with a matching list node (position in the global blocking clients list for that key)
         in the client private blocking key dict.
      *  flag the client with CLIENT_BLOCKED
      *  update blocking statistics
      *  register the client on the timeout table
      
      **Key Unblock**
      ---------------------------------------------------
      
      Unblocking a specific key will be triggered (same as today) by calling signalKeyAsReady.
      the implementation in that part will stay the same as today - adding the key to the global readyList.
      The reason to maintain the readyList (as apposed to iterating over all clients blocked on the specific key)
      is in order to keep the signal operation as short as possible, since it is called during the command processing.
      The main change is that instead of going through a dedicated code path that operates the blocked command
      we will just call processPendingCommandsAndResetClient.
      
      **ClientUnblock (keys)**
      ---------------------------------------------------
      
      1. Unblocking clients on keys will be triggered after command is
         processed and during the beforeSleep
      8. the general schema is:
      9. For each key *k* in the readyList:
      ```            
      For each client *c* which is blocked on *k*:
                  in case either:
      	          1. *k* exists AND the *k* type matches the current client blocking type
      	  	      OR
      	          2. *k* exists and *c* is blocked on module command
      	    	      OR
      	          3. *k* does not exists and *c* was blocked with the flag
      	             unblock_on_deleted_key
                       do:
                                        1. remove the client from the list of clients blocked on this key
                                        2. remove the blocking list node from the client blocking key dict
                                        3. remove the client from the timeout list
                                        10. queue the client on the unblocked_clients list
                                        11. *NEW*: call processCommandAndResetClient(c);
      ```
      *NOTE:* for module blocked clients we will still call the moduleUnblockClientByHandle
                    which will queue the client for processing in moduleUnblockedClients list.
      
      **Process Unblocked clients**
      ---------------------------------------------------
      
      The process of all unblocked clients is done in the beforeSleep and no change is planned
      in that part.
      
      The general schema will be:
      For each client *c* in server.unblocked_clients:
      
              * remove client from the server.unblocked_clients
              * set back the client readHandler
              * continue processing the pending command and input buffer.
      
      *Some notes regarding the new implementation*
      ---------------------------------------------------
      
      1. Although it was proposed, it is currently difficult to remove the
         read handler from the client while it is blocked.
         The reason is that a blocked client should be unblocked when it is
         disconnected, or we might consume data into void.
      
      2. While this PR mainly keep the current blocking logic as-is, there
         might be some future additions to the infrastructure that we would
         like to have:
         - allow non-preemptive blocking of client - sometimes we can think
           that a new kind of blocking can be expected to not be preempt. for
           example lets imagine we hold some keys on disk and when a command
           needs to process them it will block until the keys are uploaded.
           in this case we will want the client to not disconnect or be
           unblocked until the process is completed (remove the client read
           handler, prevent client timeout, disable unblock via debug command etc...).
         - allow generic blocking based on command declared keys - we might
           want to add a hook before command processing to check if any of the
           declared keys require the command to block. this way it would be
           easier to add new kinds of key-based blocking mechanisms.
      Co-authored-by: default avatarOran Agra <oran@redislabs.com>
      Signed-off-by: default avatarRan Shidlansik <ranshid@amazon.com>
      383d902c