- 09 Oct, 2018 1 commit
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antirez authored
The idea is to have an API for the cases like -BUSY state and DEBUG RELOAD where we have to manually deinstall the read handler. See #4804.
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- 14 Sep, 2018 2 commits
- 05 Sep, 2018 2 commits
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antirez authored
See #5304.
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zhaozhao.zz authored
To avoid copying buffers to create a large Redis Object which exceeding PROTO_IOBUF_LEN 32KB, we just read the remaining data we need, which may less than PROTO_IOBUF_LEN. But the remaining len may be zero, if the bulklen+2 equals sdslen(c->querybuf), in client pause context. For example: Time1: python >>> import os, socket >>> server="127.0.0.1" >>> port=6379 >>> data1="*3\r\n$3\r\nset\r\n$1\r\na\r\n$33000\r\n" >>> data2="".join("x" for _ in range(33000)) + "\r\n" >>> data3="\n\n" >>> s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) >>> s.settimeout(10) >>> s.connect((server, port)) >>> s.send(data1) 28 Time2: redis-cli client pause 10000 Time3: >>> s.send(data2) 33002 >>> s.send(data3) 2 >>> s.send(data3) Traceback (most recent call last): File "<stdin>", line 1, in <module> socket.error: [Errno 104] Connection reset by peer To fix that, we should check if remaining is greater than zero.
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- 04 Sep, 2018 6 commits
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zhaozhao.zz authored
If we are going to read a large object from network try to make it likely that it will start at c->querybuf boundary so that we can optimize object creation avoiding a large copy of data. But only when the data we have not parsed is less than or equal to ll+2. If the data length is greater than ll+2, trimming querybuf is just a waste of time, because at this time the querybuf contains not only our bulk. It's easy to reproduce the that: Time1: call `client pause 10000` on slave. Time2: redis-benchmark -t set -r 10000 -d 33000 -n 10000. Then slave hung after 10 seconds.
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antirez authored
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zhaozhao.zz authored
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antirez authored
Related to #5305.
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antirez authored
Technically speaking we don't really need to put the master client in the clients that need to be processed, since in practice the PING commands from the master will take care, however it is conceptually more sane to do so.
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antirez authored
Processing command from the master while the slave is in busy state is not correct, however we cannot, also, just reply -BUSY to the replication stream commands from the master. The correct solution is to stop processing data from the master, but just accumulate the stream into the buffers and resume the processing later. Related to #5297.
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- 29 Aug, 2018 4 commits
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zhaozhao.zz authored
Function setProtocolError just records proctocol error details in server log, set client as CLIENT_CLOSE_AFTER_REPLY. It doesn't care about querybuf sdsrange, because we will do it after procotol parsing.
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zhaozhao.zz authored
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zhaozhao.zz authored
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zhaozhao.zz authored
This is an optimization for processing pipeline, we discussed a problem in issue #5229: clients may be paused if we apply `CLIENT PAUSE` command, and then querybuf may grow too large, the cost of memmove in sdsrange after parsing a completed command will be horrible. The optimization is that parsing all commands in queyrbuf , after that we can just call sdsrange only once.
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- 18 Jul, 2018 2 commits
- 17 Jul, 2018 2 commits
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antirez authored
Related to #5135, see discussion there.
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Oran Agra authored
The slave sends \n keepalive messages to the master while parsing the rdb, and later sends REPLCONF ACK once a second. rarely, the master recives both a linefeed char and a REPLCONF in the same read, \n*3\r\n$8\r\nREPLCONF\r\n... and it tries to trim two chars (\r\n) from the query buffer, trimming the '*' from *3\r\n$8\r\nREPLCONF\r\n... then the master tries to process a command starting with '3' and replies to the slave a bunch of -ERR and one +OK. although the slave silently ignores these (prints a log message), this corrupts the replication offset at the slave since the slave increases the replication offset, and the master did not. other than the fix in processInlineBuffer, i did several other improvments while hunting this very rare bug. - when redis replies with "unknown command" it includes a portion of the arguments, not just the command name. so it would be easier to understand what was recived, in my case, on the slave side, it was -ERR, but the "arguments" were the interesting part (containing info on the error). - about a year ago i added code in addReplyErrorLength to print the error to the log in case of a reply to master (since this string isn't actually trasmitted to the master), now changed that block to print a similar log message to indicate an error being sent from the master to the slave. note that the slave is marked as CLIENT_SLAVE only after PSYNC was received, so this will not cause any harm for REPLCONF, and will only indicate problems that are gonna corrupt the replication stream anyway. - two places were c->reply was emptied, and i wanted to reset sentlen this is a precaution (i did not actually see such a problem), since a non-zero sentlen will cause corruption to be transmitted on the socket.
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- 16 Jul, 2018 2 commits
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antirez authored
Reading the PR gave me the opportunity to better specify what the code was doing in places where I was not immediately sure about what was going on. Moreover I documented the structure in server.h so that people reading the header file will immediately understand what the structure is useful for.
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Oran Agra authored
A) slave buffers didn't count internal fragmentation and sds unused space, this caused them to induce eviction although we didn't mean for it. B) slave buffers were consuming about twice the memory of what they actually needed. - this was mainly due to sdsMakeRoomFor growing to twice as much as needed each time but networking.c not storing more than 16k (partially fixed recently in 237a38737). - besides it wasn't able to store half of the new string into one buffer and the other half into the next (so the above mentioned fix helped mainly for small items). - lastly, the sds buffers had up to 30% internal fragmentation that was wasted, consumed but not used. C) inefficient performance due to starting from a small string and reallocing many times. what i changed: - creating dedicated buffers for reply list, counting their size with zmalloc_size - when creating a new reply node from, preallocate it to at least 16k. - when appending a new reply to the buffer, first fill all the unused space of the previous node before starting a new one. other changes: - expose mem_not_counted_for_evict info field for the benefit of the test suite - add a test to make sure slave buffers are counted correctly and that they don't cause eviction
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- 09 Jul, 2018 3 commits
- 02 Jul, 2018 1 commit
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antirez authored
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- 29 Jun, 2018 1 commit
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antirez authored
Making it more similar to KILL.
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- 28 Jun, 2018 2 commits
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zhaozhao.zz authored
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zhaozhao.zz authored
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- 27 Jun, 2018 6 commits
- 13 Jun, 2018 1 commit
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zhaozhao.zz authored
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- 07 Jun, 2018 1 commit
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Itamar Haber authored
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- 22 Mar, 2018 2 commits
- 15 Mar, 2018 2 commits