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https://issues.apache.org/jira/browse/CASSANDRA-4482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491369#comment-13491369
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Stefan Fleiter commented on CASSANDRA-4482:
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Won't the in-memory trees still be useful especially for doing repairs under
heavy load situation?
With Apache Cassandra Anti Entropy finding the inconsistencies adds a big
additional load on the servers while with continuous Anti Entropy only the
amount of inconsistencies adds load.
A cheap continuous Anti Entropy which repairs more than 99% of all
inconsistencies automatically and can be active even if the cluster is under
heavy load seems beneficial to me.
This is especially the case if QUORUM read/writes can not used or for a
recovering cluster after an outage of several nodes for more than
max_hint_window_in_ms.
Getting things 100% correct can for some scenarios wait for a longer time than
repairing most inconsistencies.
> 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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