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https://issues.apache.org/jira/browse/CASSANDRA-5661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13714550#comment-13714550
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Pavel Yaskevich edited comment on CASSANDRA-5661 at 7/20/13 11:05 PM:
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Maybe that's side effect of theadlocals, i am not sure. We need recordStats()
to expose some via JMX, FileCache uses separate metrics service as we track
explicitly every get/release which are exposed via JMX the same way as the rest
of Cassandra, i didn't do that for multiway yet but that would be a final step.
Edit: I have also added onRemoval listener with the latest patch which does
syscall to close the file among other things, which could have affected
borrow/release latencies somehow.
was (Author: xedin):
Maybe that's side effect of theadlocals, i am not sure. We need
recordStats() to expose some via JMX, FileCache uses separate metrics service
as we track explicitly every get/release which are exposed via JMX the same way
as the rest of Cassandra, i didn't do that for multiway yet but that would be a
final step.
> 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: 2.0.1
>
> Attachments: CASSANDRA-5661-global-multiway-cache.patch,
> CASSANDRA-5661.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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