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From "Marcus Eriksson (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-6455) Improve concurrency of repair process
Date Wed, 08 Oct 2014 11:50:34 GMT


Marcus Eriksson updated CASSANDRA-6455:
    Attachment: 6455-tinyfix.patch

+1, attaching tiny fix to the options checking in StorageService

I think we should also move the anticompaction stuff out of StorageService and into ActiveRepairService
(or even RepairSession) and make it run in parallel (ie obey the -j parameter), but i'm totally
fine doing that in another ticket (will create)

> Improve concurrency of repair process
> -------------------------------------
>                 Key: CASSANDRA-6455
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Yuki Morishita
>            Assignee: Yuki Morishita
>            Priority: Minor
>             Fix For: 3.0
>         Attachments: 6455-3.0-v2.txt, 6455-3.0.txt, 6455-tinyfix.patch, 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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