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Posted to commits@cassandra.apache.org by "Caleb Rackliffe (Jira)" <ji...@apache.org> on 2026/03/17 15:48:00 UTC

[jira] [Commented] (CASSANDRA-18216) Allow sharding of the SAI in-memory index

    [ https://issues.apache.org/jira/browse/CASSANDRA-18216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18066378#comment-18066378 ] 

Caleb Rackliffe commented on CASSANDRA-18216:
---------------------------------------------

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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