walterddr commented on issue #10498: URL: https://github.com/apache/pinot/issues/10498#issuecomment-1789340981
2 issues i think 1. when multiple threads merging all group-by results into a relatively low cardinality group set ( e.g. num-of-group ~= num-of-thread) causes concurrent index map lock/unlock blocking each other 2. when the group-by results are merged into a relatively large cardinality group set (e.g. num-of-group ~= num-of-row), the overhead for managing each group in the concurrent index map becomes significant -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For additional commands, e-mail: commits-h...@pinot.apache.org
