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From Øystein Grøvlen (JIRA) <j...@apache.org>
Subject [jira] Commented: (DERBY-3562) Number of log files (and log dir size) on the slave increases continuously
Date Fri, 21 Mar 2008 10:07:24 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581046#action_12581046
] 

Øystein Grøvlen commented on DERBY-3562:
----------------------------------------

I think the issue may be that checkpointing is only happening at the master.  Hence, log files
are garbage-collected on the master, but not on the slave.  If that is the case, one risk
that with a long-running replication, the disk on the slave side will fill up.  I do not think
this is acceptable, and we need to look into how the recovery thread can be modified to garbage
collect log files when checkpoint log records are encountered.

> Number of log files (and log dir size) on the slave increases continuously
> --------------------------------------------------------------------------
>
>                 Key: DERBY-3562
>                 URL: https://issues.apache.org/jira/browse/DERBY-3562
>             Project: Derby
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 10.4.0.0, 10.5.0.0
>         Environment: -
>            Reporter: Ole Solberg
>         Attachments: master_slave-db_size-6.jpg
>
>
> I did a simple test inserting tuples in a table during replication:
> The attached file 'master_slave-db_size-6.jpg' shows that 
> the size of the log directory (and number of files in the log directory)
> increases continuously during replication, while on master the size 
> (and number of files) never exceeds ~12Mb (12 files?) in this scenario.
> The seg0 directory on the slave stays at the same size as the master 
> seg0 directory.

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