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Mysql slave invalidating query cache entries

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Below is the list of your questions that I wasn’t able to answer during the webinar, with responses: Q: Hi Sveta.

We found this severely annoying and now use My SQL's event scheduler to update a timer table on each master every second, so we can actually see actual delay from the global master (in a non-ring topology) or delay from any peer in a ring.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.Description: I'm having issues in production with a slave similar to bug #60696 Replication has stopped on the machine and any command to "stop slave" or "show slave status" locks up.In the processlist below, there is a 7-day running "invalidating query cache" command.Users can then add invalidation patterns to an invalidation group that manipulates the same table and column.