[jira] [Created] (CASSANDRA-20303) CEP-45 adds a replication mechanism to track and reconcile individual mutations, as well as processes to actively reconcile missing mutations

["Blake Eggleston (Jira)" <ji...@apache.org>]

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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