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https://issues.apache.org/jira/browse/CASSANDRA-5624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13962308#comment-13962308
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J.B. Langston commented on CASSANDRA-5624:
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Nobody on 1.2 has hit it. As far as I know, just the one occurrence.
> Memory leak in SerializingCache
> -------------------------------
>
> Key: CASSANDRA-5624
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5624
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.1.1
> Reporter: Jonathan Ellis
> Assignee: Ryan McGuire
>
> A customer reported a memory leak when off-heap row cache is enabled.
> I gave them a patch against 1.1.9 to troubleshoot
> (https://github.com/jbellis/cassandra/commits/row-cache-finalizer). This
> confirms that row cache is responsible. Here is a sample of the log:
> {noformat}
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 69)
> Unreachable memory still has nonzero refcount 1
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 71)
> Unreachable memory 140337996747792 has not been freed (will free now)
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 69)
> Unreachable memory still has nonzero refcount 1
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 71)
> Unreachable memory 140337989287984 has not been freed (will free now)
> {noformat}
> That is, memory is not being freed because we never got to zero references.
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