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https://issues.apache.org/jira/browse/CASSANDRA-5661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13707684#comment-13707684
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Pavel Yaskevich commented on CASSANDRA-5661:
--------------------------------------------
Thanks, it worked that time, I did a quick test on local machine with global
cache backed by MultiwayPool.
MultiwayPool average run: median 3.1, 95th 4.7, 99.9th 21.9
FileCacheService (+ LinkedTranferQueue) average run: median 2.4, 95th 3.0,
99.9th 17.1
It's the same setup that I used in my previous test with no writes and no
compaction.
I will try to experiment with ArrayBlockingQueue as we know upper bound on
concurrency and update my FileCacheService patch with either of them (LTQ vs.
ABQ) soon.
> Discard pooled readers for cold data
> ------------------------------------
>
> Key: CASSANDRA-5661
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5661
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.2.1
> Reporter: Jonathan Ellis
> Assignee: Pavel Yaskevich
> Fix For: 2.0
>
> Attachments: CASSANDRA-5661-multiway-per-sstable.patch,
> CASSANDRA-5661.patch, CASSANDRA-5661-v2-global-multiway-per-sstable.patch,
> DominatorTree.png, Histogram.png
>
>
> Reader pooling was introduced in CASSANDRA-4942 but pooled
> RandomAccessReaders are never cleaned up until the SSTableReader is closed.
> So memory use is "the worst case simultaneous RAR we had open for this file,
> forever."
> We should introduce a global limit on how much memory to use for RAR, and
> evict old ones.
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