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From "Antoine Brochard (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3008) Possible Memory leak due to TransactionContext and java.util.Timer
Date Thu, 30 Jun 2011 00:43:28 GMT
Possible Memory leak due to TransactionContext and java.util.Timer
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                 Key: JCR-3008
                 URL: https://issues.apache.org/jira/browse/JCR-3008
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core, transactions
    Affects Versions: 2.2.1
         Environment:  jdk 1.6.0_24
            Reporter: Antoine Brochard



I observed that sometimes when working on large write operations, instances of  TransactionContext
stay referenced by an instance of  java.util.TaskQueue

I may be wrong but

In TransactionContext.prepare() the rollback task is scheduled :

  timer.schedule(this, timeout * 1000, Integer.MAX_VALUE);

Then in java.util.Timer:  
 - if the rollback task has not been cancelled yet ( for example if a large commit is in progress
) when the TimerThread get to work on it 
 - and the timeout expired ( executionTime<currentTime) 

then since the period is set to  Integer.MaxValue, and other tasks are in the same queue,
the next time the task is examined and removed from the queue may be in several days !!

If my analysis is correct I have several proposals
- the period parameter could be omitted when calling the schedule method
- a call to Timer.purge() could be made after cancelling the task

hope this helps




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