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From "Stu Hood (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-193) Proactive repair
Date Sat, 05 Dec 2009 01:33:20 GMT


Stu Hood updated CASSANDRA-193:

    Attachment: 193-5-manual-repair.diff

Rebased: back down to only 5 patches.


> Proactive repair
> ----------------
>                 Key: CASSANDRA-193
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Stu Hood
>             Fix For: 0.5
>         Attachments: 193-1-tree-preparation.diff, 193-1-tree-preparation.diff, 193-1-tree-preparation.diff,
193-1-tree-preparation.diff, 193-2-tree.diff, 193-2-tree.diff, 193-2-tree.diff, 193-2-tree.diff,
193-3-aes-preparation.diff, 193-3-aes-preparation.diff, 193-3-aes-preparation.diff, 193-3-aes-preparation.diff,
193-4-aes.diff, 193-4-aes.diff, 193-4-aes.diff, 193-4-aes.diff, 193-5-manual-repair.diff,
193-5-manual-repair.diff, 193-5-manual-repair.diff, 193-6-inverted-filter.diff, 193-6-inverted-filter.diff,
193-6-repair-explanation-and-node-rename.diff, 193-7-disable-caching-and-fix-minimum-token.diff,
193-breakdown.txt, 193-breakdown.txt, mktree-and-binary-tree.png
> Currently cassandra supports "read repair," i.e., lazy repair when a read is done.  This
is better than nothing but is not sufficient for some cases (e.g. catastrophic node failure
where you need to rebuild all of a node's data on a new machine).
> Dynamo uses merkle trees here.  This is harder for Cassandra given the CF data model
but I suppose we could just hash the serialized CF value.

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