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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-8787) Decrease Default concurrent_compactors from number of CPU
Date Wed, 11 Feb 2015 17:09:12 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-8787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

T Jake Luciani resolved CASSANDRA-8787.
---------------------------------------
    Resolution: Duplicate

Ok good 

> Decrease Default concurrent_compactors from number of CPU
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-8787
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8787
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Sebastian Estevez
>            Priority: Minor
>             Fix For: 3.0
>
>
> Currently we default concurrent_compactors to the number of avaliable CPUs which means
compactions can theoretically take over all threads and prevent reads and writes from happening.
> I'm currently seeing an extreme case of this that is caused by [6405|https://issues.apache.org/jira/browse/CASSANDRA-6405].
But, in general, this is a bad default. We should probably default concurrent_compactors to
num_cpu to cores/2 or even cores/4.



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