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Date: Mon, 16 Jan 2012 16:26:41 +0000 (UTC)
From: "Vijay (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (CASSANDRA-3721) Staggering repair
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     [ https://issues.apache.org/jira/browse/CASSANDRA-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vijay updated CASSANDRA-3721:
-----------------------------

    Reviewer: slebresne
    
> Staggering repair
> -----------------
>
>                 Key: CASSANDRA-3721
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3721
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.1
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.1
>
>         Attachments: 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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