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https://issues.apache.org/jira/browse/CASSANDRA-6455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14048988#comment-14048988
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Yuki Morishita commented on CASSANDRA-6455:
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Pushed latest version: https://github.com/yukim/cassandra/tree/6455-v3
bq. Seems the rebase lost CASSANDRA-3569 - we need to unregister from the FD
once all validation messages have arrived.
Added.
bq. We should probably cap how big X we can have in -j X - really easy to OOM
the nodes involved if you put a big X in.
Right. I thought about the right number to cap and came up with 4 because we
don't want to push too much anyway. I also updated command option description
to clarify.
bq. Should we make the taskExecutor in RepairSession static?
The reason I made taskExecutor local to RepairSession instance is to cancel all
submitted tasks when session faild. I left this as is in the latest version.
bq. Why do we add ourselves as a no-op StreamEventHandler in
LocalSyncTask/StreamingRepairTask when creating the StreamPlan?
handleStreamEvent as well as onSuccess/onFailure is part of StreamEventHandler.
We don't need to handle only on success/failure but not other events like
progress.
> Improve concurrency of repair process
> -------------------------------------
>
> Key: CASSANDRA-6455
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6455
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Yuki Morishita
> Assignee: Yuki Morishita
> Priority: Minor
> Fix For: 3.0
>
> Attachments: 6455-3.0.txt, 6455.txt
>
>
> Currently, most of the repair tasks (taking snapshots, send/receiving merkle
> tree, compute MT difference, etc) are done on single threaded
> AntiEntropyStage.
> This causes a problem like CASSANDRA-6415 and likely to cause unnecessary
> wait.
> Also, repair is done one CF at the time. I think we can parallelize
> this(concurrency is configurable by a user based on # of CF and load of the
> nodes) for faster processing.
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