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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-1291) Remove GC options from JobManager and TaskManager scripts
Date Thu, 27 Nov 2014 19:25:12 GMT
Stephan Ewen created FLINK-1291:
-----------------------------------

             Summary: Remove GC options from JobManager and TaskManager scripts
                 Key: FLINK-1291
                 URL: https://issues.apache.org/jira/browse/FLINK-1291
             Project: Flink
          Issue Type: Improvement
          Components: other
    Affects Versions: 0.8-incubating
            Reporter: Stephan Ewen
             Fix For: 0.8-incubating


Currently, the start scripts set a series of GC options

  - The Tenured Gen GC is set to ConcurrentMarkSweep
  - The Perm Gen is set to be collected during swipes (CMSClassUnloading)
  - The ratio between Perm Gen and New Gen is fixed

I propose to remove all of those options:
  - Users can pass their own GC arguments through the JAVA_OPTS
  - CMS is not considered a competitive GC any more (starting from Java 7, G1 seems much better)
  - PermGen garbage collection happens in all GCs anyways
  - The ratio between TenuredGen and New Gen has proven harmful in the past




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