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https://issues.apache.org/jira/browse/CASSANDRA-5661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694410#comment-13694410
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Jonathan Ellis edited comment on CASSANDRA-5661 at 6/27/13 1:36 AM:
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I don't see what similar-sized files has to do with it. CRAR buffer size is
independent of file size, and that's what causes the fragmentation. (Zeroing
out large buffers isn't free, either.)
was (Author: jbellis):
I don't see what similar-sized files has to do with it. CRAR buffer size
is independent of file size, and that's what causes the fragmentation.
> 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: 1.2.7
>
> Attachments: 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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