[jira] [Commented] (CASSANDRA-5624) Memory leak in SerializingCache

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-5624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13837750#comment-13837750 ] 

Jonathan Ellis commented on CASSANDRA-5624:
-------------------------------------------

[~jblangston@datastax.com] Has anyone with this problem upgraded to 1.2?  Did that make any difference?

> 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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