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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4482) In-memory merkle trees for repair
Date Tue, 14 Aug 2012 15:09:38 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434175#comment-13434175
] 

Jonathan Ellis commented on CASSANDRA-4482:
-------------------------------------------

bq. If you've lready xor'd all these together, S does include the hash of your existing row
A. Updating A to A' hashes A'

Right, I'm saying that given S-including-hash-of-A, what you want is to take A *out* when
you add A'.  Otherwise, if you have a node that (correctly) has A', but doesn't know about
A (maybe it was compacted out before it got to build S), then it won't agree on the same state
S even though it has the same data.
                
> In-memory merkle trees for repair
> ---------------------------------
>
>                 Key: CASSANDRA-4482
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4482
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Marcus Eriksson
>
> this sounds cool, we should reimplement it in the open source cassandra;
> http://www.acunu.com/2/post/2012/07/incremental-repair.html

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