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