First make sure that the "max_allowed_packet" setting is the same on both 
masters.

Make sure that setting is active on the slave in question.  Then start 
replication or bounce the master (not sure which I did to fix this the last 
time I ran into this).


Elizabeth Mattijsen
=========================================
On Feb 16, 2011, at 12:20 PM, Carl wrote:
> I am running master - master replication between two locations using MySQL 
> version 5.1.41 on Slackware Linux 13 (64bit).
> 
> The problem from show slave status is:
> 
>                   Last_Error: Relay log read failure: Could not parse relay 
> log event entry. The possible reasons are: the master's binary log is 
> corrupted (you can check this by running 'mysqlbinlog' on the binary log), 
> the slave's relay log is corrupted (you can check this by running 
> 'mysqlbinlog' on the relay log), a network problem, or a bug in the master's 
> or slave's MySQL code. If you want to check the master's binary log or 
> slave's relay log, you will be able to know their names by issuing 'SHOW 
> SLAVE STATUS' on this slave.
>                 Skip_Counter: 1
>          Exec_Master_Log_Pos: 552321409
>              Relay_Log_Space: 165412833
>              Until_Condition: None
>               Until_Log_File:
>                Until_Log_Pos: 0
>           Master_SSL_Allowed: No
>           Master_SSL_CA_File:
>           Master_SSL_CA_Path:
>              Master_SSL_Cert:
>            Master_SSL_Cipher:
>               Master_SSL_Key:
>        Seconds_Behind_Master: NULL
> Master_SSL_Verify_Server_Cert: No
>                Last_IO_Errno: 1236
>                Last_IO_Error: Got fatal error 1236 from master when reading 
> data from binary log: 'log event entry exceeded max_allowed_packet; Increase 
> max_allowed_packet on master'
>               Last_SQL_Errno: 1594
>               Last_SQL_Error: Relay log read failure: Could not parse relay 
> log event entry. The possible reasons are: the master's binary log is 
> corrupted (you can check this by running 'mysqlbinlog' on the binary log), 
> the slave's relay log is corrupted (you can check this by running 
> 'mysqlbinlog' on the relay log), a network problem, or a bug in the master's 
> or slave's MySQL code. If you want to check the master's binary log or 
> slave's relay log, you will be able to know their names by issuing 'SHOW 
> SLAVE STATUS' on this slave.
> 
> I have tried telling it to skip that transaction (set global 
> sql_slave_skip_counter = 1) to no avail.
> 
> From what I have been able to determine from searching the Internet, it 
> appears that the replication is failing replicating blobs ahich are basically 
> jpg's of members.  If I understand the problem, it is caused by blob 
> containing a character which is the same character that is used to mark the 
> end of a transaction in the bin log.
> 
> My questions: 1) Is this a reasonable/correct analysis and 2) how do I work 
> around the issue?
> 
> Thanks,
> 
> Carl
> 
> 
> 
> 


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