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