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From "Christian Spriegel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11301) Non-obsoleting compaction operations over compressed files can impose rate limit on normal reads
Date Wed, 09 Mar 2016 09:45:41 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186860#comment-15186860
] 

Christian Spriegel commented on CASSANDRA-11301:
------------------------------------------------

I don't know if it helps:

We saw these throttled reads when we had repair running with -pr on. We turned primary-range
off, and now this issues is gone.

btw: With the -pr flag enabled, we had easily 50-100 concurrent validations running concurrently
for some reason (Without -pr its back to a single validation). Maybe the issue requires such
a high amount of concurrent compactions/validations?  

> Non-obsoleting compaction operations over compressed files can impose rate limit on normal
reads
> ------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-11301
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11301
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Benedict
>            Assignee: Stefania
>             Fix For: 2.2.6
>
>
> Broken by CASSANDRA-9240; the rate limiting reader passes the ICompressedFile interface
to its parent, which uses this to attach an "owner" - which means the reader gets recycled
on close, i.e. pooled, for normal use. If the compaction were to replace the sstable there
would be no problem, which is presumably why this hasn't been encountered frequently. However
validation compactions on long lived sstables would permit these rate limited readers to accumulate.



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