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From "Yuki Morishita (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-4292) Improve JBOD loadbalancing and reduce contention
Date Mon, 20 Aug 2012 15:23:38 GMT


Yuki Morishita commented on CASSANDRA-4292:

Tests set up:
Server - 1 node, uses 4292-v4 patch and  current trunk
Client - 3 nodes, each runs stress insert (modified to write to different CF) for 5,000,000
keys with Leveled Compaction Strategy

I take 'iostat -x 1' from beginning of stress load to end of all compactions. Result is uploaded

>From above charts, you can see slight improvement in compaction speed(patched version
ended fast). Also, patched version uses all disks evenly compared to trunk.
> Improve JBOD loadbalancing and reduce contention
> ------------------------------------------------
>                 Key: CASSANDRA-4292
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Yuki Morishita
>             Fix For: 1.2.0
>         Attachments: 4292.txt, 4292-v2.txt, 4292-v3.txt, 4292-v4.txt
> As noted in CASSANDRA-809, we have a certain amount of flush (and compaction) threads,
which mix and match disk volumes indiscriminately.  It may be worth creating a tight thread
-> disk affinity, to prevent unnecessary conflict at that level.
> OTOH as SSDs become more prevalent this becomes a non-issue.  Unclear how much pain this
actually causes in practice in the meantime.

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