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https://issues.apache.org/jira/browse/CASSANDRA-10230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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T Jake Luciani updated CASSANDRA-10230:
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Issue Type: Improvement (was: Bug)
> Remove coordinator batchlog from materialized views
> ---------------------------------------------------
>
> Key: CASSANDRA-10230
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10230
> Project: Cassandra
> Issue Type: Improvement
> Reporter: T Jake Luciani
> Assignee: Joel Knighton
> Fix For: 3.0.x
>
>
> We are considering removing or making optional the coordinator batchlog.
> The batchlog primary serves as a way to quickly reach consistency between
> base and view since we don't have any kind of read repair between base and
> view. But we do have repair so as long as you don't lose nodes while writing
> at CL.ONE you will be eventually consistent.
> I've committed to the 3.0 branch a way to disable the coordinator with
> {{-Dcassandra.mv_disable_coordinator_batchlog=true}}
> The majority of the performance hit to throughput is currently the batchlog
> as shown by this chart.
> http://cstar.datastax.com/graph?stats=f794245a-4d9d-11e5-9def-42010af0688f&metric=op_rate&operation=1_user&smoothing=1&show_aggregates=true&xmin=0&xmax=498.52&ymin=0&ymax=50142.4
> I'd like to have tests run with and without this flag to validate how quickly
> we achieve quorum consistency without repair writing with CL.ONE. Once we
> can see there is little/no impact we can permanently remove the coordinator
> batchlog.
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