[FLINK-1291] Remove GC options from JobManager and TaskManager scripts

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.0
• Assignee: Unassigned
• Reporter: Stephan Ewen
• Created: 27/Nov/14 19:24
• Updated: 16/Jun/16 17:11
• Resolved: 28/Nov/14 18:17

Description

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