Mysql slave state invalidating 100 fat dating

25-Nov-2017 13:24

I belive the issue is not related to long running queries.

First because i dont't see the servers processing anything, and second, because as i mentiomed in update4, the server stops processing and gets stuck on invalidating cache on the old non-Percona servers which caused the replication to halt until the cache was invalidated (Which took a lot of time). id=60696 We solved the issue by moving entirely to Percona My SQL server v5.5 which has the ability to disable Query Cache completely.

but really, this looks mostly like a case of the actual thread status being misreported, and your issue is insufficient disk I/O bandwidth for the workload (or excessive flushing).

Try Alon, you seem to be making lots of different accounts, which is making editing your question harder.

When creating a test table in server 4, checking the relay log in server 1 shows the create statement was copied to the relay log in server 1 instantly, but the table is not created. Servers 1 2 & 4 were having "invalidating query cache entries (table)" stuck in their replication thread.

Replication delay for server2 starts growing, replication delay for server3 stays zero : server2 is done with query one, starts processing query two. Server3 will be done with query 3, replication delay jumps back to zero, and then back up to 10 as it processes the next query.

Platform: , with only difference in that the post-processed data is stored using separate INSERT and UPDATE queries rather than INSERT ON DUPLICATE KEY UPDATE.

I'm discounting #38551 as this happened more than once since after turning the query cache off.Listening to binlog updates is also a great way to update search indexes or to invalidate caches.As of now it is possible to access binary logs from outside RDS with the release of My SQL 5.6 in RDS.I'm running a 4 servers master-master cluster of My Sql. Replication topology: 1 - 1 UPDATE It seems that server 3 has its SBM at 0, while the other servers are jumping up and down. It looks like the server is busy doing something, and there is a huge delay between when the server gets the statement, and when it executes it. After disabling cache, server 4 is ok but 1&2 are still having this issue. id=60696 If anyone knows how to fix it, i would be glad to hear There is one flaw with mysql's seconds_behind_master value: it only takes into account the position relative to one upstream hop away.

(2 servers version 5.1, and 2 version 5.5) While checking the slave status, i see the seconds_behind_master at 0, and half a second after i see it jumps to 2000, and so fourth. Easiest demonstrated with a slightly simpler replication topology: server1 - server3 If server2 falls behind, and is processing some long-running queries, the following will happen, assuming as start point: : Everyone ok : server1 writes two 10-minute queries to the binlog, no replication delay anywhere : server2 starts processing query one. : server2 is done with query 2, replication delay zero again.In basic terms the processing steps involved are compression of time series data in per second resolution into per minute, hour and day resolutions. It is the Query #3 that eventually produces the error "", presumably because it is the first one to timeout.