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https://issues.apache.org/jira/browse/CASSANDRA-4222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-4222.
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Resolution: Fixed
Fix Version/s: 1.1.1
Reviewer: jbellis
Assignee: Marcus Eriksson
It would be nice to have some kind of optional leak detection finalizer, but in
the meantime you're right that this is unnecessary and a performance hit.
Committed to 1.1.1 and trunk
> Improve serializing off-heap cache by not using finalizers
> ----------------------------------------------------------
>
> Key: CASSANDRA-4222
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4222
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Fix For: 1.1.1
>
> Attachments:
> 0001-Remove-finalizers-in-FreeableMemory-and-Memory-to-im.patch
>
>
> We have a cluster that takes alot of reads and we have some issues with the
> off-heap caching, seeing several G of Finalizer objects on the heap
> My conclusion is that the finalizer thread is too slow to run the finalize
> method on the FreeableMemory (and Memory) objects.
> Simply removing the finalize() methods improves performance _alot_ (using
> finalizers is 50% slower in my micro benchmarks) and does not leak memory
> during "normal" use as far as i can see
> im not sure about the implications for other use cases though
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