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https://issues.apache.org/jira/browse/SOLR-7319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shawn Heisey updated SOLR-7319:
-------------------------------
Description:
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.
was:
A twitter engineer found a bug in the JVM that contributes to GC pause problems:
http://www.evanjones.ca/jvm-mmap-pause.html
We should implement the workaround and document the impact in CHANGES.txt.
> 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
> Fix For: 5.1
>
> Attachments: 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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