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https://issues.apache.org/jira/browse/SOLR-12144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16423093#comment-16423093
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Jan Høydahl commented on SOLR-12144:
------------------------------------
New patch with a change to the Ref-Guide:
{code:java}
-Java Garbage Collection logs are rotated by the JVM when size hits 20M, for a
max of 9 generations. Old GC logs are moved to `SOLR_LOGS_DIR/archived`. These
settings can only be changed by editing the start scripts.
+Java Garbage Collection logs are rotated by the JVM when size hits 20M, for a
max of 9 generations.
-On every startup of Solr, the start script will clean up old logs and rotate
the main `solr.log` file. If you changed the `<DefaultRolloverStrategy
max="10"/>` setting in `log4j2.xml`, you also need to change the corresponding
setting `-rotate_solr_logs 10` in the start script.
-
-You can disable the automatic log rotation at startup by changing the setting
`SOLR_LOG_PRESTART_ROTATION` found in `bin/solr.in.sh` or `bin/solr.in.cmd` to
false.
+On every startup or restart of Solr, log4j2 performs log rotation. If you
choose to use another log framework that does not support rotation on startup,
you may enable `SOLR_LOG_PRESTART_ROTATION` in `solr.in.sh` or `solr.in.cmd` to
let the start script rotate the logs on startup.
{code}
> Remove SOLR_LOG_PRESTART_ROTATION and leverage log4j2
> ------------------------------------------------------
>
> Key: SOLR-12144
> URL: https://issues.apache.org/jira/browse/SOLR-12144
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: scripts and tools
> Reporter: Varun Thacker
> Assignee: Jan Høydahl
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: SOLR-12144.patch, SOLR-12144.patch, SOLR-12144.patch
>
>
> With log4j2 rotating the file on restart is as simple as adding a policy -
> OnStartupTriggeringPolicy
> So we can remove Solr logic which does the same and exposes it via
> SOLR_LOG_PRESTART_ROTATION .
>
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