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From "Vijay (Updated) (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-3721) Staggering repair
Date Tue, 24 Jan 2012 17:36:41 GMT


Vijay updated CASSANDRA-3721:

    Attachment: 0001-add-snapshot-command.patch

Hi Sylvain, Plz see the attached this patch will add the command. Ideally this patch should
not break the backward compatibility because it just adds a command...
> Staggering repair
> -----------------
>                 Key: CASSANDRA-3721
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.1
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.1
>         Attachments: 0001-add-snapshot-command.patch, 0001-staggering-repair-with-snapshot.patch
> Currently repair runs on all the nodes at once and causing the range of data to be hot
(higher latency on reads).
> Sequence:
> 1) Send a repair request to all of the nodes so we can hold the references of the SSTables
(point at which repair was initiated)
> 2) Send Validation on one node at a time (once completed will release references).
> 3) Hold the reference of the tree in the requesting node and once everything is complete
start diff.
> We can also serialize the streaming part not more than 1 node is involved in the streaming.

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