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https://issues.apache.org/jira/browse/SOLR-12874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16650900#comment-16650900
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Shawn Heisey commented on SOLR-12874:
-------------------------------------

Is 20M properly interpreted by Java 8?  If not, we'll need different options 
for different java versions.

Sounds like there needs to be a bug filed against Java, because all of Oracle's 
documentation that I've been able to locate indicates that the number should be 
interpreted as kilobytes if a unit is not provided.

> Java 9+ GC Log files are being rotated every 20KB instead of every 20MB
> -----------------------------------------------------------------------
>
>                 Key: SOLR-12874
>                 URL: https://issues.apache.org/jira/browse/SOLR-12874
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 7.5
>            Reporter: Tim Underwood
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The Java 9+ GC logging options in bin/solr and bin/solr.cmd specify a log 
> rotation file size of 20000 which according to JEP 158 
> ([https://openjdk.java.net/jeps/158]) should be the "file size in kb" however 
> when running Solr on Java 11 I'm seeing GC logs rotated every 20KB.
> Changing "filesize=20000" to "filesize=20M" fixes the problem for me under 
> Linux.



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