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Posted to issues-all@impala.apache.org by "Wenzhe Zhou (Jira)" <ji...@apache.org> on 2021/05/24 15:13:00 UTC
[jira] [Resolved] (IMPALA-10197) Add KUDU_REPLICA_SELECTION config
and query option
[ https://issues.apache.org/jira/browse/IMPALA-10197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenzhe Zhou resolved IMPALA-10197.
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Fix Version/s: Impala 4.1
Resolution: Fixed
> Add KUDU_REPLICA_SELECTION config and query option
> --------------------------------------------------
>
> Key: IMPALA-10197
> URL: https://issues.apache.org/jira/browse/IMPALA-10197
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 4.0
> Reporter: Grant Henke
> Assignee: Wenzhe Zhou
> Priority: Trivial
> Labels: kudu, newbie, ramp-up
> Fix For: Impala 4.1
>
>
> Sometimes it is useful to target queries at the LEADER_ONLY instead of the default CLOSEST_REPLICA. We should expose this option in Impala similar to the way KUDU_READ_MODE is exposed:
> https://impala.apache.org/docs/build/html/topics/impala_kudu_read_mode.html
> Currently there is a test only flag, FLAGS_pick_only_leaders_for_tests, that somewhat does this:
> https://github.com/apache/impala/blob/da2999afd9ddc45d35141649d17db507e03ee9bf/be/src/exec/kudu-scanner.cc#L195-L198
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