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Posted to issues@kudu.apache.org by "Grant Henke (Jira)" <ji...@apache.org> on 2021/02/18 21:43:00 UTC

[jira] [Assigned] (KUDU-3248) Expose replica selection option that provides better affinity for remote scans

     [ https://issues.apache.org/jira/browse/KUDU-3248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Henke reassigned KUDU-3248:
---------------------------------

    Assignee: Grant Henke

> Expose replica selection option that provides better affinity for remote scans
> ------------------------------------------------------------------------------
>
>                 Key: KUDU-3248
>                 URL: https://issues.apache.org/jira/browse/KUDU-3248
>             Project: Kudu
>          Issue Type: Improvement
>          Components: client
>            Reporter: David Rorke
>            Assignee: Grant Henke
>            Priority: Major
>
> Kudu clients like Impala that use the CLOSEST_REPLICA selection option can suffer from bad tserver buffer cache warmup/locality during remote scans due to lack of tserver affinity as described in IMPALA-10481.
> The Kudu client should expose a replica selection option that provides better affinity when doing remote scans.   The comments in IMPALA-10481 suggest a new LOCAL_OR_LEADER option that would select a local replica if one exists, otherwise fallback to the leader.



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