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From "Wei Deng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12366) Fix compaction throttle
Date Sun, 14 Aug 2016 05:13:22 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei Deng updated CASSANDRA-12366:
---------------------------------
    Labels: compaction performance  (was: )

> Fix compaction throttle
> -----------------------
>
>                 Key: CASSANDRA-12366
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12366
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Compaction
>            Reporter: T Jake Luciani
>            Assignee: T Jake Luciani
>              Labels: compaction, performance
>             Fix For: 3.10
>
>
> Compaction throttling is broken in the following ways:
>   * It throttles bytes read after being decompressed
>   * Compaction creates multiple scanners which share the rate limiter causing too much
throttling
>   * It bears no resemblance to the reported compaction time remaining calculation (Bytes
of source sstables processed since start of compaction)
> To fix this we need to simplify the throttling to be only at the CompactionIterator level.



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