GH-141: Oozie uses excessive memory when doing purging
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Key: OOZIE-157
URL: https://issues.apache.org/jira/browse/OOZIE-157
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
When there are many coordinator jobs/actions eligible for purge, Oozie becomes
a memory hog when purging these jobs/actions. Oozie will purge coordinator
actions first then coordinator jobs within one transaction. First we delete
some actions and then we have select count queries on actions, this causes
OpenJPA to create a large number of CoordinatorActionBean objects - eating up
lots of memory.
To fix this, we need to have two transactions, one for deleting actions and one
for deleting jobs. Then we will not run into this scenario where you have
select count queries on some table with uncommitted changes.
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