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From "Benedict (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8787) Decrease Default concurrent_compactors from number of CPU
Date Sun, 15 Feb 2015 12:52:12 GMT


Benedict commented on CASSANDRA-8787:

[]: we don't typically like changing defaults within a release.
Users can set their own values if they need to.

> Decrease Default concurrent_compactors from number of CPU
> ---------------------------------------------------------
>                 Key: CASSANDRA-8787
>                 URL:
>             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|].
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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