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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/06/08 18:24:20 UTC
[jira] [Commented] (CASSANDRA-5624) Memory leak in SerializingCache
[ https://issues.apache.org/jira/browse/CASSANDRA-5624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678760#comment-13678760 ]
Jonathan Ellis commented on CASSANDRA-5624:
-------------------------------------------
I don't see anything obviously wrong in FreeableMemory. Unless [~krummas] or [~vijay2win@yahoo.com] see something I'm missing, I think we need to write some test harnesses to narrow it down:
# Can we reproduce with FreeableMemory [un]reference calls alone?
# Can we reproduce with FreeableMemory + CLHM? (Maybe CLHM is not calling evict where it should)
# Can we reproduce with SerializingCache outside of a full client/server environment?
> 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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