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Posted to dev@kafka.apache.org by "Xavier Léauté (JIRA)" <ji...@apache.org> on 2018/04/25 10:17:00 UTC

[jira] [Created] (KAFKA-6826) Avoid range scans when forwarding values in window store aggregations

Xavier Léauté created KAFKA-6826:
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             Summary: Avoid range scans when forwarding values in window store aggregations
                 Key: KAFKA-6826
                 URL: https://issues.apache.org/jira/browse/KAFKA-6826
             Project: Kafka
          Issue Type: Bug
            Reporter: Xavier Léauté
            Assignee: Xavier Léauté
         Attachments: Screen Shot 2018-04-25 at 11.14.25 AM.png

This is a follow-up to KAFKA-6560, where we missed at least one case that should be using single point queries instead of range-scans when forwarding values during aggregation.

Since a single range scan can sometimes account for 75% of aggregation cpu time, fixing this should provide some significant speedups (see attached flamegraph)



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