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Posted to issues@tez.apache.org by "Zhiyuan Yang (JIRA)" <ji...@apache.org> on 2017/05/03 15:55:04 UTC
[jira] [Updated] (TEZ-3708) Improve parallelism and auto grouping
of unpartitioned cartesian product
[ https://issues.apache.org/jira/browse/TEZ-3708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zhiyuan Yang updated TEZ-3708:
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Summary: Improve parallelism and auto grouping of unpartitioned cartesian product (was: Arbitrary parallelism for unpartitioned cartesian product regardless of # src tasks)
> Improve parallelism and auto grouping of unpartitioned cartesian product
> ------------------------------------------------------------------------
>
> Key: TEZ-3708
> URL: https://issues.apache.org/jira/browse/TEZ-3708
> Project: Apache Tez
> Issue Type: Sub-task
> Reporter: Zhiyuan Yang
> Assignee: Zhiyuan Yang
>
> Current unpartitioned cartesian product has a few limitations
> 1. parallelism can be not enough in case of large split and small # src task
> 2. parallelism can be too much in in case of large # src task
> 3. workload is not ideally distributed across the worker. Even with auto grouping, grouping by size may not be accurate because same size can means different #record and different cartesian product ops.
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