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Posted to commits@cassandra.apache.org by "Chris Lohfink (JIRA)" <ji...@apache.org> on 2016/12/06 16:13:58 UTC
[jira] [Commented] (CASSANDRA-13006) Disable automatic heap dumps
on OOM error
[ https://issues.apache.org/jira/browse/CASSANDRA-13006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15725927#comment-15725927 ]
Chris Lohfink commented on CASSANDRA-13006:
-------------------------------------------
I am {{-1}} on this. With current compaction strategies production nodes should have 50-30% free disk space and a heap dump of 8gb is difference between being able to debug bad issues and not. Its like removing log files to save disk space. If anything making it a "rotating" heap dumpa to only have at most 5 or something sounds like a better idea (like log files).
> Disable automatic heap dumps on OOM error
> -----------------------------------------
>
> Key: CASSANDRA-13006
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13006
> Project: Cassandra
> Issue Type: Bug
> Components: Configuration
> Reporter: anmols
> Priority: Minor
>
> With CASSANDRA-9861, a change was added to enable collecting heap dumps by default if the process encountered an OOM error. These heap dumps are stored in the Apache Cassandra home directory unless configured otherwise (see [Cassandra Support Document|https://support.datastax.com/hc/en-us/articles/204225959-Generating-and-Analyzing-Heap-Dumps] for this feature).
>
> The creation and storage of heap dumps aides debugging and investigative workflows, but is not be desirable for a production environment where these heap dumps may occupy a large amount of disk space and require manual intervention for cleanups.
>
> Managing heap dumps on out of memory errors and configuring the paths for these heap dumps are available as JVM options in JVM. The current behavior conflicts with the Boolean JVM flag HeapDumpOnOutOfMemoryError.
>
> A patch can be proposed here that would make the heap dump on OOM error honor the HeapDumpOnOutOfMemoryError flag. Users who would want to still generate heap dumps on OOM errors can set the -XX:+HeapDumpOnOutOfMemoryError JVM option.
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