MySQL - Why would SHOW SLAVE HOSTS cause a binlog dump?

Posted by Rory McCann on Server Fault See other posts from Server Fault or by Rory McCann
Published on 2009-08-12T09:01:48Z Indexed on 2010/03/11 5:08 UTC
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Filed under:

mysql

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linux

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mysql-replication

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mysql-binlog

We're getting loads of binlog files in our MySQL 5.0.x. We have a normal master/slave replication thing going with 1 master, 1 slave. Looking at /var/log/mysql.log, nearly 90% of the time the replicator connects and does a SHOW SLAVE HOSTS causes a bin log dump.

For example:

    	   7020 Query       SHOW SLAVE HOSTS
    	   7020 Binlog Dump Log: 'mysql-bin.029634'  Pos: 13273

However when I do a SHOW SLAVE HOSTS on the mysql myself, I get no results.

Occasionally when the replicator does a SHOW SLAVE HOSTS, mysql will hang for hours. I see nothing in the /var/log/syslog at the same time...

What's going on here? How can I debug this more?

For the record the MySQL master and slave servers are ubuntu dapper.

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