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Vijay commented on CASSANDRA-3635:
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I think it will be much better if we can prioritize, long running compaction vs
normal compaction, lets sat we have
10MB Compaction limit
2MB Validation compaction limit
2MB is the limit for the validation for a while and when normal compaction
kicks in we might want to hold the validation and do the compction complete
because that will affect the read performance and continue with the validation
compaction after that. by doing this we can set something like
12MB Compaction limit
6 MB Validation compaction limit
and still be within the HDD limit of 12MB.
The good thing about normal compaction is that it is spread out and not all the
nodes are not involved in it.
I am starting to think that we can do repairs one by one for a range (within a
region), so the traffic doesnt get stuck waiting for the IO. Hope it makes
sense.
> Throttle validation separately from other compaction
> ----------------------------------------------------
>
> Key: CASSANDRA-3635
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3635
> 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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