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https://issues.apache.org/jira/browse/CASSANDRA-5351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864196#comment-13864196
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Lyuben Todorov commented on CASSANDRA-5351:
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[~krummas] I've rebased the [branch|https://github.com/lyubent/cassandra/] to
the latest trunk, there are some issues with the rebase and I'm in the process
of addresing said issues, but I though It'd be useful for you to see the
updated branch. I'll look at the issues you noted once I sort out the rebase
problems (fwiw the problem is with tables getting compacted before the repair
command's completion and causing null pointer exceptions at
SSTableReader#getApproximateKeyCount)
> 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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