[eclipselink-dev] Fix for bug 355610 checked in

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[eclipselink-dev] Fix for bug 355610 checked in

From: Vikram Bhatia <vikram.jeet.bhatia@xxxxxxxxxx>
Date: Fri, 26 Aug 2011 00:14:27 -0700 (PDT)
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Bug 355610 - Distributed cache merge needs to use appendlock instead of acquirelock

Distributed cache merge currently uses acquireLock for merging new objects into the cache leaving a possibility of running into a deadlock with ConcurrencyManager. It has been replaced to call appendLock() which will transition to deferred lock if failed to acquire lock.

Reviewed By: Gordon Yorke

Testing: LRG & JPA LRG (100%) with Oracle database & MySQL.

Checked into trunk at r9971.

2.3.1 check-in pending.

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