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Posted to dev@hbase.apache.org by "Charles Connell (Jira)" <ji...@apache.org> on 2025/06/18 12:24:00 UTC

[jira] [Resolved] (HBASE-29385) Very slow performance when using AsyncAggregationClient for large scans

     [ https://issues.apache.org/jira/browse/HBASE-29385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Charles Connell resolved HBASE-29385.
-------------------------------------
    Resolution: Fixed

> Very slow performance when using AsyncAggregationClient for large scans
> -----------------------------------------------------------------------
>
>                 Key: HBASE-29385
>                 URL: https://issues.apache.org/jira/browse/HBASE-29385
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Charles Connell
>            Assignee: Charles Connell
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 2.7.0, 3.0.0-beta-2, 2.6.3
>
>
> In HBASE-28770 I introduced new code paths in {{AggregateImplementation}} that are activated when the user uses {{AsyncAggregationClient}}. The goal of this is to respect HBase's quotas when evaluating the user's request. I've been testing this at a large scale. The current code checks for quotas exceeded once for every call to {{InternalScanner#next()}}. This is not cheap and as a result, calls to {{AggregateImplementation}} are tens or hundreds of times slower than they otherwise would be. In this ticket I'll do this check less often.



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