Keith Wall created QPID-7977:
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Summary: [Java Broker] [HA] Direct memory leak possible when
mastership is lost
Key: QPID-7977
URL: https://issues.apache.org/jira/browse/QPID-7977
Project: Qpid
Issue Type: Bug
Components: Java Broker
Reporter: Keith Wall
During the work of QPID-7832, it was noticed that there is a potential for the
direct memory used for uncommitted messages to be leak when a node loses the
mastership.
The test that exposed the direct leak is:
org.apache.qpid.server.store.berkeleydb.replication.MultiNodeTest#testLossOfMasterNodeCausesClientToFailover
I think the problem is this. When mastership is lost, the underlying database
operation fail. For instance, the virtualhost that was master is rolling back
open transactions. This causes the messages that were committed to the store
to be removed
(org.apache.qpid.server.store.berkeleydb.AbstractBDBMessageStore.StoredBDBMessage#remove).
The underlying database operation fails
(org/apache/qpid/server/store/berkeleydb/AbstractBDBMessageStore.java:1085),
this prevents the direct memory associated with the messages from being
released.
The operation of the group is unaffected, and there is no message loss. The
JVM should eventually release the direct memory itself.
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