[jira] [Updated] (CASSANDRA-20303) CEP-45: Mutation Tracking

["Caleb Rackliffe (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-20303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Caleb Rackliffe updated CASSANDRA-20303:
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    Attachment: ci_summary.html
                result_details.tar.gz

> 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
>         Attachments: ci_summary.html, result_details.tar.gz
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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