[jira] [Resolved] (FLINK-2343) Change default garbage collector in streaming environments

["Ufuk Celebi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ufuk Celebi resolved FLINK-2343.
--------------------------------
    Resolution: Fixed

Fixed via d368a9b.

> Change default garbage collector in streaming environments
> ----------------------------------------------------------
>
>                 Key: FLINK-2343
>                 URL: https://issues.apache.org/jira/browse/FLINK-2343
>             Project: Flink
>          Issue Type: Improvement
>          Components: Start-Stop Scripts
>    Affects Versions: 0.10
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>             Fix For: 0.10
>
>
> When starting Flink, we don't pass any particular GC related JVM flags to the system. That means, it uses the default garbage collectors, which are the bulk parallel GCs for both old gen and new gen.
> For streaming applications, this results in vastly fluctuating latencies. Latencies are much more constant with either the {{CMS}} or {{G1}} GC.
> I propose to make the CMS the default GC for streaming setups.
> G1 may become the GC of choice in the future, but fro various articles I found, it is still somewhat in "beta" status (see for example here: http://jaxenter.com/kirk-pepperdine-on-the-g1-for-java-9-118190.html )



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