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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-1719) improve read repair
Date Tue, 09 Nov 2010 23:18:28 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930346#action_12930346
] 

Brandon Williams edited comment on CASSANDRA-1719 at 11/9/10 6:18 PM:
----------------------------------------------------------------------

I get odd behavior testing this patch.  Three node cluster, rf=2, HH disabled.  I start them
up, take one down after the others see it, then insert data.  If I read it back with the node
down, that works, but when I bring it up all kinds of keys are missing (even though I don't
read from it directly.)  If I take it back down, everything works again.

      was (Author: brandon.williams):
    I get odd behavior testing this patch.  Three node cluster, rf=2.  I start them up, take
one down after the others see it, then insert data.  If I read it back with the node down,
that works, but when I bring it up all kinds of keys are missing (even though I don't read
from it directly.)  If I take it back down, everything works again.
  
> improve read repair
> -------------------
>
>                 Key: CASSANDRA-1719
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1719
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.6.8, 0.7.0
>
>         Attachments: 1719.txt
>
>
> Read repair recomputes the local digest for each replica, which is a lot of wasted CPU
on large reads

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