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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Avoid Simultaneous Minor Compactions?
Date Mon, 22 Aug 2011 15:09:58 GMT
Specifically, look at compaction_throughput_mb_per_sec in cassandra.yaml

On Mon, Aug 22, 2011 at 12:39 AM, Ryan King <ryan@twitter.com> wrote:
> You should throttle your compactions to a sustainable level.
>
> -ryan
>
> On Sun, Aug 21, 2011 at 10:22 PM, Hefeng Yuan <hfyuan@rhapsody.com> wrote:
>> We just noticed that at one time, 4 nodes were doing minor compaction together, each
of them took 20~60 minutes.
>> We're on 0.8.1, 6 nodes, RF5.
>> This simultaneous compactions slowed down the whole cluster, we have local_quorum
consistency level, therefore, dynamic_snitch is not helping us.
>>
>> Aside from lower down the compaction thread priority, is there any other way to tell
the cluster hold on doing this if other nodes are already compacting?
>>
>> Thanks,
>> Hefeng
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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