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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5351) Avoid repairing already-repaired data by default
Date Thu, 06 Feb 2014 04:02:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13893003#comment-13893003
] 

Yuki Morishita commented on CASSANDRA-5351:
-------------------------------------------

Pushed update to https://github.com/yukim/cassandra/commits/5351-3
I removed fullRepair flag from message and ParentRepairSession.
I think we are ready to test. If you don't need to add more, let's rebase on the latest trunk,
squash the commits and attach the patch here.

I'll keep on testing...

> Avoid repairing already-repaired data by default
> ------------------------------------------------
>
>                 Key: CASSANDRA-5351
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5351
>             Project: Cassandra
>          Issue Type: Task
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Lyuben Todorov
>              Labels: repair
>             Fix For: 2.1
>
>         Attachments: 5351_node1.log, 5351_node2.log, 5351_node3.log, 5351_nodetool.log
>
>
> Repair has always built its merkle tree from all the data in a columnfamily, which is
guaranteed to work but is inefficient.
> We can improve this by remembering which sstables have already been successfully repaired,
and only repairing sstables new since the last repair.  (This automatically makes CASSANDRA-3362
much less of a problem too.)
> The tricky part is, compaction will (if not taught otherwise) mix repaired data together
with non-repaired.  So we should segregate unrepaired sstables from the repaired ones.



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