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From "Vijay (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3635) Throttle validation separately from other compaction
Date Thu, 15 Dec 2011 21:13:30 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170490#comment-13170490
] 

Vijay commented on CASSANDRA-3635:
----------------------------------

Nope, I think we can create a tree independent on the nodes and then compare it

Lets say we create a tree on A first after completion, we can create a tree on B and then
on C (We have to sync on time, may be flush at the time when the repair was requested or something
like that).

Once we have all the 3 Trees we can compare and transfer which as required. Once we have all
the trees we can exchange the trees and then start real streaming if needed. That way we dont
bring the whole range down or hot.
                
> 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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