You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@lucene.apache.org by "Alexandre Rafalovitch (JIRA)" <ji...@apache.org> on 2016/10/03 15:45:20 UTC
[jira] [Closed] (SOLR-7319) Workaround the "Four Month Bug" causing
GC pause problems
[ https://issues.apache.org/jira/browse/SOLR-7319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alexandre Rafalovitch closed SOLR-7319.
---------------------------------------
Resolution: Information Provided
No next action.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org