- 24 Feb, 2022 1 commit
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Binbin authored
Add a comma, this would have resulted in missing newline in the message. Forgot to add in #9127
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- 23 Feb, 2022 1 commit
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Itamar Haber authored
Adds the ability to track the lag of a consumer group (CG), that is, the number of entries yet-to-be-delivered from the stream. The proposed constant-time solution is in the spirit of "best-effort." Partially addresses #8737. ## Description of approach We add a new "entries_added" property to the stream. This starts at 0 for a new stream and is incremented by 1 with every `XADD`. It is essentially an all-time counter of the entries added to the stream. Given the stream's length and this counter value, we can trivially find the logical "entries_added" counter of the first ID if and only if the stream is contiguous. A fragmented stream contains one or more tombstones generated by `XDEL`s. The new "xdel_max_id" stream property tracks the latest tombstone. The CG also tracks its last delivered ID's as an "entries_read" counter and increments it independently when delivering new messages, unless the this read counter is invalid (-1 means invalid offset). When the CG's counter is available, the reported lag is the difference between added and read counters. Lastly, this also adds a "first_id" field to the stream structure in order to make looking it up cheaper in most cases. ## Limitations There are two cases in which the mechanism isn't able to track the lag. In these cases, `XINFO` replies with `null` in the "lag" field. The first case is when a CG is created with an arbitrary last delivered ID, that isn't "0-0", nor the first or the last entries of the stream. In this case, it is impossible to obtain a valid read counter (short of an O(N) operation). The second case is when there are one or more tombstones fragmenting the stream's entries range. In both cases, given enough time and assuming that the consumers are active (reading and lacking) and advancing, the CG should be able to catch up with the tip of the stream and report zero lag. Once that's achieved, lag tracking would resume as normal (until the next tombstone is set). ## API changes * `XGROUP CREATE` added with the optional named argument `[ENTRIESREAD entries-read]` for explicitly specifying the new CG's counter. * `XGROUP SETID` added with an optional positional argument `[ENTRIESREAD entries-read]` for specifying the CG's counter. * `XINFO` reports the maximal tombstone ID, the recorded first entry ID, and total number of entries added to the stream. * `XINFO` reports the current lag and logical read counter of CGs. * `XSETID` is an internal command that's used in replication/aof. It has been added with the optional positional arguments `[ENTRIESADDED entries-added] [MAXDELETEDID max-deleted-entry-id]` for propagating the CG's offset and maximal tombstone ID of the stream. ## The generic unsolved problem The current stream implementation doesn't provide an efficient way to obtain the approximate/exact size of a range of entries. While it could've been nice to have that ability (#5813) in general, let alone specifically in the context of CGs, the risk and complexities involved in such implementation are in all likelihood prohibitive. ## A refactoring note The `streamGetEdgeID` has been refactored to accommodate both the existing seek of any entry as well as seeking non-deleted entries (the addition of the `skip_tombstones` argument). Furthermore, this refactoring also migrated the seek logic to use the `streamIterator` (rather than `raxIterator`) that was, in turn, extended with the `skip_tombstones` Boolean struct field to control the emission of these. Co-authored-by:
Guy Benoish <guy.benoish@redislabs.com> Co-authored-by:
Oran Agra <oran@redislabs.com>
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- 08 Feb, 2022 1 commit
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guybe7 authored
Fix #7021 #8924 #10198 # Intro Before this commit X[AUTO]CLAIM used to transfer deleted entries from one PEL to another, but reply with "nil" for every such entry (instead of the entry id). The idea (for XCLAIM) was that the caller could see this "nil", realize the entry no longer exists, and XACK it in order to remove it from PEL. The main problem with that approach is that it assumes there's a correlation between the index of the "id" arguments and the array indices, which there isn't (in case some of the input IDs to XCLAIM never existed/read): ``` 127.0.0.1:6379> XADD x 1 f1 v1 "1-0" 127.0.0.1:6379> XADD x 2 f1 v1 "2-0" 127.0.0.1:6379> XADD x 3 f1 v1 "3-0" 127.0.0.1:6379> XGROUP CREATE x grp 0 OK 127.0.0.1:6379> XREADGROUP GROUP grp Alice COUNT 2 STREAMS x > 1) 1) "x" 2) 1) 1) "1-0" 2) 1) "f1" 2) "v1" 2) 1) "2-0" 2) 1) "f1" 2) "v1" 127.0.0.1:6379> XDEL x 1 2 (integer) 2 127.0.0.1:6379> XCLAIM x grp Bob 0 0-99 1-0 1-99 2-0 1) (nil) 2) (nil) ``` # Changes Now, X[AUTO]CLAIM acts in the following way: 1. If one tries to claim a deleted entry, we delete it from the PEL we found it in (and the group PEL too). So de facto, such entry is not claimed, just cleared from PEL (since anyway it doesn't exist in the stream) 2. since we never claim deleted entries, X[AUTO]CLAIM will never return "nil" instead of an entry. 3. add a new element to XAUTOCLAIM's response (see below) # Knowing which entries were cleared from the PEL The caller may want to log any entries that were found in a PEL but deleted from the stream itself (it would suggest that there might be a bug in the application: trimming the stream while some entries were still no processed by the consumers) ## XCLAIM the set {XCLAIM input ids} - {XCLAIM returned ids} contains all the entry ids that were not claimed which means they were deleted (assuming the input contains only entries from some PEL). The user doesn't need to XACK them because XCLAIM had already deleted them from the source PEL. ## XAUTOCLAIM XAUTOCLAIM has a new element added to its reply: it's an array of all the deleted stream IDs it stumbled upon. This is somewhat of a breaking change since X[AUTO]CLAIM used to be able to reply with "nil" and now it can't... But since it was undocumented (and generally a bad idea to rely on it, as explained above) the breakage is not that bad.
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- 23 Jan, 2022 1 commit
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Binbin authored
Summary of changes: 1. Rename `redisCommand->name` to `redisCommand->declared_name`, it is a const char * for native commands and SDS for module commands. 2. Store the [sub]command fullname in `redisCommand->fullname` (sds). 3. List subcommands in `ACL CAT` 4. List subcommands in `COMMAND LIST` 5. `moduleUnregisterCommands` now will also free the module subcommands. 6. RM_GetCurrentCommandName returns full command name Other changes: 1. Add `addReplyErrorArity` and `addReplyErrorExpireTime` 2. Remove `getFullCommandName` function that now is useless. 3. Some cleanups about `fullname` since now it is SDS. 4. Delete `populateSingleCommand` function from server.h that is useless. 5. Added tests to cover this change. 6. Add some module unload tests and fix the leaks 7. Make error messages uniform, make sure they always contain the full command name and that it's quoted. 7. Fixes some typos see the history in #9504, fixes #10124 Co-authored-by:
Oran Agra <oran@redislabs.com> Co-authored-by:
guybe7 <guy.benoish@redislabs.com>
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- 07 Jan, 2022 1 commit
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guybe7 authored
Fix #9410 Crucial for the ms and sequence deltas, but I changed all calls, just in case (e.g. "flags") Before this commit: `ms_delta` and `seq_delta` could have overflown, causing `currid` to be wrong, which in turn would cause `streamTrim` to trim the entire rax node (see new test)
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- 22 Dec, 2021 1 commit
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guybe7 authored
The mess: Some parts use alsoPropagate for late propagation, others using an immediate one (propagate()), causing edge cases, ugly/hacky code, and the tendency for bugs The basic idea is that all commands are propagated via alsoPropagate (i.e. added to a list) and the top-most call() is responsible for going over that list and actually propagating them (and wrapping them in MULTI/EXEC if there's more than one command). This is done in the new function, propagatePendingCommands. Callers to propagatePendingCommands: 1. top-most call() (we want all nested call()s to add to the also_propagate array and just the top-most one to propagate them) - via `afterCommand` 2. handleClientsBlockedOnKeys: it is out of call() context and it may propagate stuff - via `afterCommand`. 3. handleClientsBlockedOnKeys edge case: if the looked-up key is already expired, we will propagate the expire but will not unblock any client so `afterCommand` isn't called. in that case, we have to propagate the deletion explicitly. 4. cron stuff: active-expire and eviction may also propagate stuff 5. modules: the module API allows to propagate stuff from just about anywhere (timers, keyspace notifications, threads). I could have tried to catch all the out-of-call-context places but it seemed easier to handle it in one place: when we free the context. in the spirit of what was done in call(), only the top-most freeing of a module context may cause propagation. 6. modules: when using a thread-safe ctx it's not clear when/if the ctx will be freed. we do know that the module must lock the GIL before calling RM_Replicate/RM_Call so we propagate the pending commands when releasing the GIL. A "known limitation", which were actually a bug, was fixed because of this commit (see propagate.tcl): When using a mix of RM_Call with `!` and RM_Replicate, the command would propagate out-of-order: first all the commands from RM_Call, and then the ones from RM_Replicate Another thing worth mentioning is that if, in the past, a client would issue a MULTI/EXEC with just one write command the server would blindly propagate the MULTI/EXEC too, even though it's redundant. not anymore. This commit renames propagate() to propagateNow() in order to cause conflicts in pending PRs. propagatePendingCommands is the only caller of propagateNow, which is now a static, internal helper function. Optimizations: 1. alsoPropagate will not add stuff to also_propagate if there's no AOF and replicas 2. alsoPropagate reallocs also_propagagte exponentially, to save calls to memmove Bugfixes: 1. CONFIG SET can create evictions, sending notifications which can cause to dirty++ with modules. we need to prevent it from propagating to AOF/replicas 2. We need to set current_client in RM_Call. buggy scenario: - CONFIG SET maxmemory, eviction notifications, module hook calls RM_Call - assertion in lookupKey crashes, because current_client has CONFIG SET, which isn't CMD_WRITE 3. minor: in eviction, call propagateDeletion after notification, like active-expire and all commands (we always send a notification before propagating the command)
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- 01 Dec, 2021 1 commit
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meir@redislabs.com authored
Script unit is a new unit located on script.c. Its purpose is to provides an API for functions (and eval) to interact with Redis. Interaction includes mostly executing commands, but also functionalities like calling Redis back on long scripts or check if the script was killed. The interaction is done using a scriptRunCtx object that need to be created by the user and initialized using scriptPrepareForRun. Detailed list of functionalities expose by the unit: 1. Calling commands (including all the validation checks such as acl, cluster, read only run, ...) 2. Set Resp 3. Set Replication method (AOF/REPLICATION/NONE) 4. Call Redis back to on long running scripts to allow Redis reply to clients and perform script kill The commit introduce the new unit and uses it on eval commands to interact with Redis.
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- 30 Nov, 2021 1 commit
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Itamar Haber authored
Adds the ability to autogenerate the sequence part of the millisecond-only explicit ID specified for `XADD`. This is useful in case added entries have an externally-provided timestamp without sub-millisecond resolution.
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- 18 Nov, 2021 1 commit
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Binbin authored
Moves ZPOP ... 0 fast exit path after type check to reply with WRONGTYPE. In the past it will return an empty array. Also now count is not allowed to be negative. see #9680 before: ``` 127.0.0.1:6379> set zset str OK 127.0.0.1:6379> zpopmin zset 0 (empty array) 127.0.0.1:6379> zpopmin zset -1 (empty array) ``` after: ``` 127.0.0.1:6379> set zset str OK 127.0.0.1:6379> zpopmin zset 0 (error) WRONGTYPE Operation against a key holding the wrong kind of value 127.0.0.1:6379> zpopmin zset -1 (error) ERR value is out of range, must be positive ```
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- 11 Oct, 2021 1 commit
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yoav-steinberg authored
When calling `XADD` with a predefined id (instead of `*`) there's no need to run the code which replaces the supplied id with itself. Only when we pass a wildcard id we need to do this. For apps which always supply their own id this is a slight optimization.
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- 04 Oct, 2021 1 commit
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Oran Agra authored
- fix possible heap corruption in ziplist and listpack resulting by trying to allocate more than the maximum size of 4GB. - prevent ziplist (hash and zset) from reaching size of above 1GB, will be converted to HT encoding, that's not a useful size. - prevent listpack (stream) from reaching size of above 1GB. - XADD will start a new listpack if the new record may cause the previous listpack to grow over 1GB. - XADD will respond with an error if a single stream record is over 1GB - List type (ziplist in quicklist) was truncating strings that were over 4GB, now it'll respond with an error. Co-authored-by:
sundb <sundbcn@gmail.com>
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- 26 Sep, 2021 1 commit
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Oran Agra authored
This was recently broken in #9321 when we validated stream IDs to be integers but did that after to the stepping next record instead of before.
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- 15 Sep, 2021 1 commit
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guybe7 authored
The `cmd` argument was completely unused, and all the code that bothered to pass it was unnecessary. This is a prepartion for a future commit that treats subcommands as commands
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- 09 Sep, 2021 1 commit
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Binbin authored
We want to add COUNT option for BLPOP. But we can't do it without breaking compatibility due to the command arguments syntax. So this commit introduce two new commands. Syntax for the new LMPOP command: `LMPOP numkeys [<key> ...] LEFT|RIGHT [COUNT count]` Syntax for the new BLMPOP command: `BLMPOP timeout numkeys [<key> ...] LEFT|RIGHT [COUNT count]` Some background: - LPOP takes one key, and can return multiple elements. - BLPOP takes multiple keys, but returns one element from just one key. - LMPOP can take multiple keys and return multiple elements from just one key. Note that LMPOP/BLMPOP can take multiple keys, it eventually operates on just one key. And it will propagate as LPOP or RPOP with the COUNT option. As a new command, it still return NIL if we can't pop any elements. For the normal response is nested arrays in RESP2 and RESP3, like: ``` LMPOP/BLMPOP 1) keyname 2) 1) element1 2) element2 ``` I.e. unlike BLPOP that returns a key name and one element so it uses a flat array, and LPOP that returns multiple elements with no key name, and again uses a flat array, this one has to return a nested array, and it does for for both RESP2 and RESP3 (like SCAN does) Some discuss can see: #766 #8824
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- 10 Aug, 2021 1 commit
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sundb authored
Part one of implementing #8702 (taking hashes first before other types) ## Description of the feature 1. Change ziplist encoded hash objects to listpack encoding. 2. Convert existing ziplists on RDB loading time. an O(n) operation. ## Rdb format changes 1. Add RDB_TYPE_HASH_LISTPACK rdb type. 2. Bump RDB_VERSION to 10 ## Interface changes 1. New `hash-max-listpack-entries` config is an alias for `hash-max-ziplist-entries` (same with `hash-max-listpack-value`) 2. OBJECT ENCODING will return `listpack` instead of `ziplist` ## Listpack improvements: 1. Support direct insert, replace integer element (rather than convert back and forth from string) 3. Add more listpack capabilities to match the ziplist ones (like `lpFind`, `lpRandomPairs` and such) 4. Optimize element length fetching, avoid multiple calculations 5. Use inline to avoid function call overhead. ## Tests 1. Add a new test to the RDB load time conversion 2. Adding the listpack unit tests. (based on the one in ziplist.c) 3. Add a few "corrupt payload: fuzzer findings" tests, and slightly modify existing ones. Co-authored-by:
Oran Agra <oran@redislabs.com>
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- 05 Aug, 2021 1 commit
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Oran Agra authored
Recently we found two issues in the fuzzer tester: #9302 #9285 After fixing them, more problems surfaced and this PR (as well as #9297) aims to fix them. Here's a list of the fixes - Prevent an overflow when allocating a dict hashtable - Prevent OOM when attempting to allocate a huge string - Prevent a few invalid accesses in listpack - Improve sanitization of listpack first entry - Validate integrity of stream consumer groups PEL - Validate integrity of stream listpack entry IDs - Validate ziplist tail followed by extra data which start with 0xff Co-authored-by:
sundb <sundbcn@gmail.com>
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- 02 Aug, 2021 1 commit
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menwen authored
Fixes: - When a consumer is created as a side effect, redis didn't issue a keyspace notification, nor incremented the server.dirty (affects periodic snapshots). this was a bug in XREADGROUP, XCLAIM, and XAUTOCLAIM. - When attempting to delete a non-existent consumer, don't issue a keyspace notification and don't increment server.dirty this was a bug in XGROUP DELCONSUMER Other changes: - Changed streamLookupConsumer() to always only do lookup consumer (never do implicit creation), Its last seen time is updated unless the SLC_NO_REFRESH flag is specified. - Added streamCreateConsumer() to create a new consumer. When the creation is successful, it will notify and dirty++ unless the SCC_NO_NOTIFY or SCC_NO_DIRTIFY flags is specified. - Changed streamDelConsumer() to always only do delete consumer. - Added keyspace notifications tests about stream events.
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- 13 Jul, 2021 1 commit
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Binbin authored
This would have resulted in missing newline in the help message
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- 30 Jun, 2021 1 commit
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ZhaolongLi authored
This seems to be an unimportant bug that was accidentally generated. If the user does not specify limit in streamParseAddOrTrimArgsOrReply, the initial value of args->limit is 100 * server.stream_node_max_entries, which may lead to out of bounds, and then the default function of limit in xadd becomes invalid (this failure occurs in streamTrim). Additionally, provide sane default for args->limit in case stream_node_max_entries is set to 0. Co-authored-by:
lizhaolong.lzl <lizhaolong.lzl@B-54MPMD6R-0221.local> Co-authored-by:
Oran Agra <oran@redislabs.com> Co-authored-by:
guybe7 <guy.benoish@redislabs.com>
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- 24 Jun, 2021 1 commit
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ZhaolongLi authored
The call to raxNext didn't really progress in the rax, since we were already on the last item. instead, all it does is check that it is indeed a valid item, so the new code clearer.
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- 15 Jun, 2021 1 commit
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Binbin authored
Small cleanup and consistency.
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- 10 Jun, 2021 1 commit
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Binbin authored
This PR adds a spell checker CI action that will fail future PRs if they introduce typos and spelling mistakes. This spell checker is based on blacklist of common spelling mistakes, so it will not catch everything, but at least it is also unlikely to cause false positives. Besides that, the PR also fixes many spelling mistakes and types, not all are a result of the spell checker we use. Here's a summary of other changes: 1. Scanned the entire source code and fixes all sorts of typos and spelling mistakes (including missing or extra spaces). 2. Outdated function / variable / argument names in comments 3. Fix outdated keyspace masks error log when we check `config.notify-keyspace-events` in loadServerConfigFromString. 4. Trim the white space at the end of line in `module.c`. Check: https://github.com/redis/redis/pull/7751 5. Some outdated https link URLs. 6. Fix some outdated comment. Such as: - In README: about the rdb, we used to said create a `thread`, change to `process` - dbRandomKey function coment (about the dictGetRandomKey, change to dictGetFairRandomKey) - notifyKeyspaceEvent fucntion comment (add type arg) - Some others minor fix in comment (Most of them are incorrectly quoted by variable names) 7. Modified the error log so that users can easily distinguish between TCP and TLS in `changeBindAddr`
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- 07 Jun, 2021 1 commit
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Huang Zhw authored
The decision to stop trimming due to LIMIT in XADD and XTRIM was after the limit was reached. i.e. the code was deleting **at least** that count of records (from the LIMIT argument's perspective, not the MAXLEN), instead of **up to** that count of records. see #9046
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- 06 Jun, 2021 1 commit
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Huang Zhw authored
xtrimCommand call streamParseAddOrTrimArgsOrReply should use xadd==0. When the syntax is valid, it does not cause any bugs because the params of XADD is superset of XTRIM. Just XTRIM will not respond with error on invalid syntax. The syntax of XADD will also be accpeted by XTRIM.
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- 27 Apr, 2021 1 commit
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Andy Pan authored
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- 14 Apr, 2021 1 commit
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Bonsai authored
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- 07 Apr, 2021 1 commit
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Yang Bodong authored
Fix out of range error messages to be clearer (avoid mentioning 9223372036854775807) * Fix XAUTOCLAIM COUNT option confusing error msg * Fix other RPOP and alike error message to mention positive
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- 01 Apr, 2021 1 commit
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Valentino Geron authored
This command used to return the last scanned entry id as the cursor, instead of the next one to be scanned. so in the next call, the user could / should have sent `(cursor` and not just `cursor` if he wanted to avoid scanning the same record twice. Scanning the record twice would look odd if someone is checking what exactly was scanned, but it also has a side effect of incrementing the delivery count twice.
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- 30 Mar, 2021 1 commit
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guybe7 authored
To align with XCLAIM and the XAUTOCLAIM docs
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- 24 Mar, 2021 1 commit
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Oran Agra authored
the corrupt-dump-fuzzer test found a case where an access to a corrupt stream would have caused accessing to uninitialized memory. now it'll panic instead. The issue was that there was a stream that says it has more than 0 records, but looking for the max ID came back empty handed. p.s. when sanitize-dump-payload is used, this corruption is detected, and the RESTORE command is gracefully rejected.
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- 16 Mar, 2021 1 commit
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Ikko Ashimine authored
arguements -> arguments
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- 01 Mar, 2021 1 commit
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Oran Agra authored
When sanitizing the stream listpack, we need to count the deleted records too. otherwise the last line that checks the next pointer fails. Add test to cover that state in the stream tests.
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- 24 Feb, 2021 1 commit
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guybe7 authored
This aligns better with other commands, specifically XADD
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- 22 Feb, 2021 1 commit
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Huang Zw authored
If we set stream-node-max-bytes = 0, then we insert entry then delete, do this many times, the last stream node will be very big.
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- 16 Feb, 2021 1 commit
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yihuang authored
Avoid repeated reallocs growing the listpack while entries are being added. This is done by pre-allocating the listpack to near maximum size, and using malloc_size to check if it needs realloc or not. When the listpack reaches the maximum number of entries, we shrink it to fit it's used size. Co-authored-by:
Viktor Söderqvist <viktor@zuiderkwast.se> Co-authored-by:
Oran Agra <oran@redislabs.com>
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- 09 Feb, 2021 1 commit
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Madelyn Olson authored
Moved most static strings into the shared structure
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- 02 Feb, 2021 1 commit
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zhaozhao.zz authored
This bug would have let users observe logically expired keys on replicas and during CLIENT PAUSE WRITE.
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- 28 Jan, 2021 1 commit
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Viktor Söderqvist authored
APIs added for these stream operations: add, delete, iterate and trim (by ID or maxlength). The functions are prefixed by RM_Stream. * RM_StreamAdd * RM_StreamDelete * RM_StreamIteratorStart * RM_StreamIteratorStop * RM_StreamIteratorNextID * RM_StreamIteratorNextField * RM_StreamIteratorDelete * RM_StreamTrimByLength * RM_StreamTrimByID The type RedisModuleStreamID is added and functions for converting from and to RedisModuleString. * RM_CreateStringFromStreamID * RM_StringToStreamID Whenever the stream functions return REDISMODULE_ERR, errno is set to provide additional error information. Refactoring: The zset iterator fields in the RedisModuleKey struct are wrapped in a union, to allow the same space to be used for type- specific info for streams and allow future use for other key types.
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- 08 Jan, 2021 1 commit
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guybe7 authored
This PR adds another trimming strategy to XADD and XTRIM named MINID (complements the existing MAXLEN). It also adds a new LIMIT argument that allows incremental trimming by repeated calls (rather than all at once). This provides the ability to trim all records older than a certain ID (which makes it possible for the user to trim by age too). Example: XTRIM mystream MINID ~ 1608540753 will trim entries with id < 1608540753, but might not trim all (because of the ~ modifier) The purpose is to ease the use of streams. many users use streams as logs and the common case is wanting a log of the last X seconds rather than a log that contains maximum X entries (new MINID vs existing MAXLEN) The new LIMIT modifier is only supported when the trim strategy uses ~. i.e. when the user asked for exact trimming, it all happens in one go (no possibility for incremental trimming). However, when ~ is provided, we trim full rax nodes, up to the limit number of records. The default limit is 100*stream_node_max_entries (used when LIMIT is not provided). I.e. this is a behavior change (even if the existing MAXLEN strategy is used). An explicit limit of 0 means unlimited (but note that it's not the default). Other changes: Refactor arg parsing code for XADD and XTRIM to use common code.
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- 06 Jan, 2021 1 commit
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guybe7 authored
New command: XAUTOCLAIM <key> <group> <consumer> <min-idle-time> <start> [COUNT <count>] [JUSTID] The purpose is to claim entries from a stale consumer without the usual XPENDING+XCLAIM combo which takes two round trips. The syntax for XAUTOCLAIM is similar to scan: A cursor is returned (streamID) by each call and should be used as start for the next call. 0-0 means the scan is complete. This PR extends the deferred reply mechanism for any bulk string (not just counts) This PR carries some unrelated test code changes: - Renames the term "client" into "consumer" in the stream-cgroups test - And also changes DEBUG SLEEP into "after" Co-authored-by:
Oran Agra <oran@redislabs.com>
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