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Posted to commits@cassandra.apache.org by "Mike Adamson (Jira)" <ji...@apache.org> on 2023/08/15 16:25:00 UTC

[jira] (CASSANDRA-18734) SAI result retriever is filtering too many rows

    [ https://issues.apache.org/jira/browse/CASSANDRA-18734 ]


    Mike Adamson deleted comment on CASSANDRA-18734:
    ------------------------------------------

was (Author: mike_tr_adamson):
Here is a flamegraph against the latest changes:

[^flamegraph.svg]

> SAI result retriever is filtering too many rows
> -----------------------------------------------
>
>                 Key: CASSANDRA-18734
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18734
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Feature/SAI
>            Reporter: Mike Adamson
>            Assignee: Mike Adamson
>            Priority: Normal
>         Attachments: flamegraph.svg, image-2023-08-08-13-48-19-701.png, image-2023-08-08-13-49-19-576.png
>
>
> Performance tests on SAI have shown that the number of rows being filtered for wide row partitions is more than expected. For a 10k row/partition test - limit 10, the following has been observed.
> !image-2023-08-08-13-49-19-576.png|width=952,height=368!
> This is not the expected outcome of row-awareness and needs investigating. The number of rows read should, roughly, match the number of partitions read.
>  



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