- 21 Jun, 2014 3 commits
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antirez authored
Info about the replication state with the master added.
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antirez authored
The new ROLE command is designed in order to provide a client with informations about the replication in a fast and easy to use way compared to the INFO command where the same information is also available.
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antirez authored
This commit adds peer ID caching in the client structure plus an API change and the use of sdsMakeRoomFor() in order to improve the reallocation pattern to generate the CLIENT LIST output. Both the changes account for a very significant speedup.
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- 05 Feb, 2014 1 commit
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antirez authored
Sometime an osx master with a Linux server over a slow link caused a strange error where osx called the writable function for the socket but actually apparently there was no room in the socket buffer to accept the write: write(2) call returned an EAGAIN error, that was not checked, so we considered write(2) == 0 always as a connection reset, which was unfortunate since the bulk transfer has to start again. Also more errors are logged with the WARNING level in the same code path now.
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- 08 Jan, 2014 2 commits
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antirez authored
Masters not understanding REPLCONF ACK will reply with errors to our requests causing a number of possible issues. This commit detects a global replication offest set to -1 at the end of the replication, and marks the client representing the master with the REDIS_PRE_PSYNC flag. Note that this flag was called REDIS_PRE_PSYNC_SLAVE but now it is just REDIS_PRE_PSYNC as it is used for both slaves and masters starting with this commit. This commit fixes issue #1488.
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antirez authored
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- 22 Dec, 2013 1 commit
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antirez authored
Currently replication offsets could be used into a limited way in order to understand, out of a set of slaves, what is the one with the most updated data. For example this comparison is possible of N slaves were replicating all with the same master. However the replication offset was not transferred from master to slaves (that are later promoted as masters) in any way, so for instance if there were three instances A, B, C, with A master and B and C replication from A, the following could happen: C disconnects from A. B is turned into master. A is switched to master of B. B receives some write. In this context there was no way to compare the offset of A and C, because B would use its own local master replication offset as replication offset to initialize the replication with A. With this commit what happens is that when B is turned into master it inherits the replication offset from A, making A and C comparable. In the above case assuming no inconsistencies are created during the disconnection and failover process, A will show to have a replication offset greater than C. Note that this does not mean offsets are always comparable to understand what is, in a set of instances, since in more complex examples the replica with the higher replication offset could be partitioned away when picking the instance to elect as new master. However this in general improves the ability of a system to try to pick a good replica to promote to master.
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- 10 Dec, 2013 3 commits
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antirez authored
The previous fix for false positive timeout detected by master was not complete. There is another blocking stage while loading data for the first synchronization with the master, that is, flushing away the current data from the DB memory. This commit uses the newly introduced dict.c callback in order to make some incremental work (to send "\n" heartbeats to the master) while flushing the old data from memory. It is hard to write a regression test for this issue unfortunately. More support for debugging in the Redis core would be needed in terms of functionalities to simulate a slow DB loading / deletion.
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antirez authored
Redis hash table implementation has many non-blocking features like incremental rehashing, however while deleting a large hash table there was no way to have a callback called to do some incremental work. This commit adds this support, as an optiona callback argument to dictEmpty() that is currently called at a fixed interval (one time every 65k deletions).
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antirez authored
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- 05 Dec, 2013 1 commit
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antirez authored
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- 28 Nov, 2013 1 commit
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antirez authored
We now have replicationSetMaster() and replicationUnsetMaster() that can be called in other contexts (for instance Redis Cluster).
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- 11 Nov, 2013 1 commit
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antirez authored
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- 04 Oct, 2013 2 commits
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antirez authored
Sometimes when we resurrect a cached master after a successful partial resynchronization attempt, there is pending data in the output buffers of the client structure representing the master (likely REPLCONF ACK commands). If we don't reinstall the write handler, it will never be installed again by addReply*() family functions as they'll assume that if there is already data pending, the write handler is already installed. This bug caused some slaves after a successful partial sync to never send REPLCONF ACK, and continuously being detected as timing out by the master, with a disconnection / reconnection loop.
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antirez authored
There was a bug that over-esteemed the amount of backlog available, however this could only happen when a slave was asking for an offset that was in the "future" compared to the master replication backlog. Now this case is handled well and logged as an incident in the master log file.
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- 03 Sep, 2013 1 commit
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Maxim Zakharov authored
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- 12 Aug, 2013 3 commits
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antirez authored
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antirez authored
The previous code using a static buffer as an optimization was lame: 1) Premature optimization, actually it was *slower* than naive code because resulted into the creation / destruction of the object encapsulating the output buffer. 2) The code was very hard to test, since it was needed to have specific tests for command lines exceeding the size of the static buffer. 3) As a result of "2" the code was bugged as the current tests were not able to stress specific corner cases. It was replaced with easy to understand code that is safer and faster.
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antirez authored
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- 28 Jul, 2013 1 commit
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antirez authored
This fixes issue #1221.
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- 18 Jul, 2013 1 commit
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antirez authored
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- 12 Jul, 2013 1 commit
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Ted Nyman authored
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- 11 Jul, 2013 3 commits
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antirez authored
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antirez authored
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Geoff Garside authored
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- 26 Jun, 2013 3 commits
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antirez authored
Clients using SYNC to replicate are older implementations, such as redis-cli --slave, and are not designed to acknowledge the master with REPLCONF ACK commands, so we don't have any feedback and should not disconnect them on timeout.
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antirez authored
This commit uses the Replication Script Cache in order to avoid translating EVALSHA into EVAL whenever possible for both the AOF and slaves.
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antirez authored
This code is only responsible to take an LRU-evicted fixed length cache of SHA1 that we are sure all the slaves received. In this commit only the implementation is provided, but the Redis core does not use it to actually send EVALSHA to slaves when possible.
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- 31 May, 2013 1 commit
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antirez authored
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- 30 May, 2013 1 commit
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antirez authored
This feature allows the user to specify the minimum number of connected replicas having a lag less or equal than the specified amount of seconds for writes to be accepted.
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- 27 May, 2013 5 commits
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antirez authored
Now masters, using the time at which the last REPLCONF ACK was received, are able to explicitly disconnect slaves that are no longer responding. Previously the only chance was to see a very long output buffer, that was highly suboptimal.
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antirez authored
ACKs can be also used as a base for synchronous replication. However in that case they'll be explicitly requested by the master when the client sends a request that needs to be replicated synchronously.
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antirez authored
Sending an ACK is now moved into the replicationSendAck() function.
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antirez authored
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antirez authored
This special command is used by the slave to inform the master the amount of replication stream it currently consumed. it does not return anything so that we not need to consume additional bandwidth needed by the master to reply something. The master can do a number of things knowing the amount of stream processed, such as understanding the "lag" in bytes of the slave, verify if a given command was already processed by the slave, and so forth.
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- 27 Feb, 2013 1 commit
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antirez authored
This commit also fixes redisLog() statements producing warnings.
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- 13 Feb, 2013 2 commits
- 12 Feb, 2013 2 commits