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https://issues.apache.org/jira/browse/CASSANDRA-6455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049831#comment-14049831
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Marcus Eriksson commented on CASSANDRA-6455:
--------------------------------------------
Ok, looks good to me
I got the exception below once during testing, but couldn't reproduce it, so I
don't know if I messed up my testing or if there is a race somewhere
{code}
ERROR [AntiEntropyStage:1] 2014-07-02 11:25:44,745 CassandraDaemon.java:166 -
Exception in thread Thread[AntiEntropyStage:1,5,main]
java.lang.AssertionError: null
at
org.apache.cassandra.repair.RepairSession.validationComplete(RepairSession.java:168)
~[main/:na]
at
org.apache.cassandra.service.ActiveRepairService.handleMessage(ActiveRepairService.java:369)
~[main/:na]
at
org.apache.cassandra.repair.RepairMessageVerbHandler.doVerb(RepairMessageVerbHandler.java:128)
~[main/:na]
at
org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62)
~[main/:na]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
~[na:1.7.0_55]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
~[na:1.7.0_55]
at java.lang.Thread.run(Thread.java:745) ~[na:1.7.0_55]
{code}
> 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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