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https://issues.apache.org/jira/browse/CASSANDRA-18216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18066378#comment-18066378
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Caleb Rackliffe commented on CASSANDRA-18216:
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There's is some initial WIP for this up
[here|https://github.com/naseryyash/cassandra/pull/1]
> Allow sharding of the SAI in-memory index
> ------------------------------------------
>
> Key: CASSANDRA-18216
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18216
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Feature/SAI
> Reporter: Mike Adamson
> Assignee: Caleb Rackliffe
> Priority: Normal
> Labels: SAI
> Fix For: 5.x
>
>
> The Memtable implementation allows it to be split into a number of shards.
> This reduces contention during writes.
> The MemtableIndex in SAI should follow this practice. It currently does not
> support sharding so all writes hit the same synchronized write block. The
> in-memory index search can also use the sharding to reduce the number of
> indexes that it searches based on the key range passed to the search.
> This exists already in the DS fork:
> https://github.com/datastax/cassandra/pull/298
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