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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-193) Proactive repair
Date Thu, 19 Nov 2009 02:03:39 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stu Hood updated CASSANDRA-193:
-------------------------------

    Attachment: 193-breakdown.txt
                193-6-inverted-filter.diff

Adding one more patch: I did some system level testing today and noticed a really dumb bug
that slipped through unit testing. Other than that, the system tests look good. I feel good
about this patchset being ready for merge.

(The filter to remove the local node from the list of natural endpoints was inverted, but
the Gossiper only has one endpoint in tests, which was hiding the fact that we weren't caching
a generated tree locally.)

> 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, 193-2-tree.diff,
193-2-tree.diff, 193-3-aes-preparation.diff, 193-3-aes-preparation.diff, 193-4-aes.diff, 193-4-aes.diff,
193-5-manual-repair.diff, 193-6-inverted-filter.diff, 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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