Praneeth created OOZIE-3409:
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Summary: Oozie Server : Possible memory leak in EL evaluation
Key: OOZIE-3409
URL: https://issues.apache.org/jira/browse/OOZIE-3409
Project: Oozie
Issue Type: Bug
Affects Versions: 5.1.0
Reporter: Praneeth
I have noticed that there is a potential memory leak in the Oozie server due to
one of its dependencies - {{commons-el:commons-el:1.0}}. Our oozie servers have
been running out of memory occasionally. It happens more often when we have
more activity. Upon analysis of the heap dump, it seems that the culprit here
is the {{org.apache.commons.el.ExpressionEvaluatorImpl}} from {{commons-el}}
which is used in the Oozie server through {{org.apache.oozie.util.ELEvaluator}}
[1] . {{ExpressionEvaluatorImpl}} uses a static {{Map}} [2] to cache the EL
evaluations. This map never gets cleared, eventually taking up all the memory.
So, in an environment with heavy usage and long running oozie servers, this
would lead to an OOM. The configurations for workflow actions we have are
possibly larger than normal which is worsening the situation as the Map has to
maintain larger strings.
#
[https://github.com/apache/oozie/blob/release-5.1.0/core/src/main/java/org/apache/oozie/util/ELEvaluator.java#L143]
#
[http://svn.apache.org/viewvc/commons/dormant/el/trunk/src/java/org/apache/commons/el/ExpressionEvaluatorImpl.java?view=markup#l94]
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