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From "Shawn Heisey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-7319) Workaround the "Four Month Bug" causing GC pause problems
Date Mon, 03 Oct 2016 15:42:20 GMT

    [ https://issues.apache.org/jira/browse/SOLR-7319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15542699#comment-15542699
] 

Shawn Heisey commented on SOLR-7319:
------------------------------------

Sounds like a good plan to me.


> Workaround the "Four Month Bug" causing GC pause problems
> ---------------------------------------------------------
>
>                 Key: SOLR-7319
>                 URL: https://issues.apache.org/jira/browse/SOLR-7319
>             Project: Solr
>          Issue Type: Bug
>          Components: scripts and tools
>    Affects Versions: 5.0
>            Reporter: Shawn Heisey
>            Assignee: Shawn Heisey
>         Attachments: SOLR-7319.patch, SOLR-7319.patch, SOLR-7319.patch
>
>
> A twitter engineer found a bug in the JVM that contributes to GC pause problems:
> http://www.evanjones.ca/jvm-mmap-pause.html
> Problem summary (in case the blog post disappears):  The JVM calculates statistics on
things like garbage collection and writes them to a file in the temp directory using MMAP.
 If there is a lot of other MMAP write activity, which is precisely how Lucene accomplishes
indexing and merging, it can result in a GC pause because the mmap write to the temp file
is delayed.
> We should implement the workaround in the solr start scripts (disable creation of the
mmap statistics tempfile) and document the impact in CHANGES.txt.



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