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https://issues.apache.org/jira/browse/CASSANDRA-20303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Blake Eggleston updated CASSANDRA-20303:
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Summary: CEP-45: Mutation Tracking (was: CEP-45 adds a replication
mechanism to track and reconcile individual mutations, as well as processes to
actively reconcile missing mutations)
> CEP-45: Mutation Tracking
> -------------------------
>
> Key: CASSANDRA-20303
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20303
> Project: Apache Cassandra
> Issue Type: Epic
> Components: Consistency/Coordination
> Reporter: Blake Eggleston
> Priority: Normal
>
> For keyspaces with mutation tracking enabled, the immediate benefits of this
> CEP are:
> * Reduce replication lag with a continuous background reconciliation process
> * Eliminate the disk load caused by repair merkle tree calculation
> * Eliminate repair overstreaming
> * Eliminate hints
> * Reduce disk load of reads on cluster to close to 1/CL
> * Fix single page mutation atomicity issues caused by read repair and short
> read protection
> Additionally, although it's outside the scope of this CEP, mutation tracking
> would enable:
> * Enable additional cluster topologies - ie: log only witness DCs
> * Enable completion of witness replicas (addresses monotonic read issue)
> The CEP is linked here:
> https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-45%3A+Mutation+Tracking,
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