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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-193) Proactive repair
Date Thu, 03 Dec 2009 01:27:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785117#action_12785117
] 

Jonathan Ellis commented on CASSANDRA-193:
------------------------------------------

that's just the "indexed" keys (the 1/128 of keys we keep in memory to bsearch on), so I would
think that would be fine

> Proactive repair
> ----------------
>
>                 Key: CASSANDRA-193
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-193
>             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,
193-2-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, 193-4-aes.diff, 193-4-aes.diff, 193-4-aes.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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