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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/06/13 00:13:00 UTC
[jira] [Assigned] (IMPALA-6404) Evenly distribute local and remote
scan ranges across Impalad(s) when 100% locality is not achievable
[ https://issues.apache.org/jira/browse/IMPALA-6404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tim Armstrong reassigned IMPALA-6404:
-------------------------------------
Assignee: (was: Lars Volker)
> Evenly distribute local and remote scan ranges across Impalad(s) when 100% locality is not achievable
> -----------------------------------------------------------------------------------------------------
>
> Key: IMPALA-6404
> URL: https://issues.apache.org/jira/browse/IMPALA-6404
> Project: IMPALA
> Issue Type: Improvement
> Components: Distributed Exec
> Reporter: Mostafa Mokhtar
> Priority: Major
> Labels: scheduler
>
> Current scheduler tries to assign as many local reads as possible, this works well if 100% locality is achievable, but in cases where some nodes have locality while others don't an even scan ranges are assigned to the backends which results in execution skew.
> Ideally the scheduler should create an even distribution of local and remote scan ranges to avoid skew.
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