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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13006) Disable automatic heap dumps on OOM error
Date Fri, 06 Oct 2017 19:56:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16195167#comment-16195167
] 

Benjamin Lerer commented on CASSANDRA-13006:
--------------------------------------------

Just realized that I forgot to switch from {{jmap}} to {{jcmd}}, for generating heap histograms,
as suggested by [~nibin.gv]. I will update my patches in the coming days.

> 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
>            Assignee: Benjamin Lerer
>            Priority: Minor
>             Fix For: 3.0.15
>
>         Attachments: 13006-3.0.9.txt
>
>
> 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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