While analyzing on the Heap Dumps generated in one of our production servers using Eclipse MAT, it was found more than half of the Heap was occupied by objects from DSR groups.(com.ibm.ws.drs.model.DRSGroups)
The server was IBM Websphere Portal 6.1.When goggled further on DRSGroups, it seems there is a memory leak reported in DRSGROUPS.
IBM describes it as "An out-of-memory might occur when DRS is enabled and a Distribution and Consistency Services (DCS) view change occurs."
It seems this affects all users of WebSphere Application Server 6.0,6.1,7.0
There is fix pack available for this
http://www-01.ibm.com/support/docview.wss?uid=swg1PK77234
http://www-01.ibm.com/support/docview.wss?rs=180&uid=swg27004980
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