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https://issues.apache.org/jira/browse/CASSANDRA-4482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434091#comment-13434091
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Jonathan Ellis commented on CASSANDRA-4482:
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bq. The commutative properties of XOR make it possible to update the MT
incrementally without having to read on write.
Thanks for the clarification, Nicolas. That sounds like a reasonable approach.
bq. To avoid using too much RAM, we allocate a fixed amount of memory per CF
and divide it into a number of smaller buffers (one per range) in order to give
the same guarantees regardless of the number of ranges per CF
Meaning, you give each CF less than 64k ranges * 16 bytes / range?
> 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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