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From "Sylvain Lebresne (Commented) (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-3635) Throttle validation separately from other compaction
Date Thu, 15 Dec 2011 17:38:30 GMT


Sylvain Lebresne commented on CASSANDRA-3635:

bq. Since compaction throughput does not include validation anymore, I'd prefer to default
to something like 12/4 instead of effectively increasing the impact of compaction + repair
out of the box.

By default, if validation_throughput_mb_per_sec, validation are still included with all compaction,
so the default shouldn't change anything. The rational was to 1) ease upgrade and 2) simplify
configuration for people that don't care about that. But now that I think of it, the fact
that compaction_throughput_mb_per_sec affects validation compaction only if the validation
specific setting is not set is probably a bit confusing. Maybe the more natural way to do
this is to have compaction_throughput_mb_per_sec be the total maximum throughput for *all*
compaction, and have 0 <= validation_throughput_mb_per_sec <= compaction_throughput_mb_per_sec
be a way to further throttle validation compaction.
> Throttle validation separately from other compaction
> ----------------------------------------------------
>                 Key: CASSANDRA-3635
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>              Labels: repair
>             Fix For: 0.8.10, 1.0.7
>         Attachments: 0001-separate-validation-throttling.patch
> Validation compaction is fairly ressource intensive. It is possible to throttle it with
other compaction, but there is cases where you really want to throttle it rather aggressively
but don't necessarily want to have minor compactions throttled that much. The goal is to (optionally)
allow to set a separate throttling value for validation.
> PS: I'm not pretending this will solve every repair problem or anything. 

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