Blake Eggleston created CASSANDRA-20303:
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Summary: CEP-45 adds a replication mechanism to track and
reconcile individual mutations, as well as processes to actively reconcile
missing mutations
Key: CASSANDRA-20303
URL: https://issues.apache.org/jira/browse/CASSANDRA-20303
Project: Apache Cassandra
Issue Type: Epic
Components: Consistency/Coordination
Reporter: Blake Eggleston
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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