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https://issues.apache.org/jira/browse/CASSANDRA-14635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Blake Eggleston updated CASSANDRA-14635:
----------------------------------------
Fix Version/s: 4.0
Status: Patch Available (was: Open)
[trunk|https://github.com/bdeggleston/cassandra/tree/C14635]
[dtests|https://github.com/bdeggleston/cassandra-dtest/tree/C14635]
Initial implementation ready for review. This adds the {{read_repair}} option
to table schema, with the options {{blocking}} (default), {{async}}, and
{{none}}.
> Support table level configuration of monotonic reads
> ----------------------------------------------------
>
> Key: CASSANDRA-14635
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14635
> Project: Cassandra
> Issue Type: Improvement
> Components: Coordination
> Reporter: Ariel Weisberg
> Assignee: Blake Eggleston
> Priority: Major
> Fix For: 4.0
>
>
> In CASSANDRA-10726 it was discussed that allowing expert users to forgo
> monotonic reads might be desirable. It is practical to control monotonicity
> of reads at a fine grained level because it involves changing the behavior of
> read repair on a per read basis.
> Per CASSANDRA-14593 we already don't preserve update atomicity down to the
> column level. You could read the key out of a row and read repair the key,
> pass the key to another process which attempts to read the value, but finds
> the value is null because read repair only repairs the data (including
> columns) that is part of the read. IMO it's a stretch to say that reads are
> monotonic. It is technically correct, the best kind of correct, but far from
> as useful as it should be.
> An initial implementation could make read repair asynchronous or forgo read
> repair entirely. This would improve the throughput and latency of reads.
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