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Posted to issues@tez.apache.org by "Zhiyuan Yang (JIRA)" <ji...@apache.org> on 2016/07/11 20:49:11 UTC
[jira] [Commented] (TEZ-1248) Reduce slow-start should special case
1 reducer runs
[ https://issues.apache.org/jira/browse/TEZ-1248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15371582#comment-15371582 ]
Zhiyuan Yang commented on TEZ-1248:
-----------------------------------
Please help review the patch. [~hitesh], [~sseth], [~gopalv], [~rajesh.balamohan].
> Reduce slow-start should special case 1 reducer runs
> ----------------------------------------------------
>
> Key: TEZ-1248
> URL: https://issues.apache.org/jira/browse/TEZ-1248
> Project: Apache Tez
> Issue Type: Improvement
> Affects Versions: 0.5.0
> Environment: 20 node cluster running tez
> Reporter: Gopal V
> Assignee: Zhiyuan Yang
> Priority: Critical
> Attachments: TEZ-1248.1.patch
>
>
> Reducer slow-start has a performance problem for the small cases where there is just 1 reducer for a case with a single wave.
> Tez knows the split count and wave count, being able to determine if the cluster has enough spare capacity to run the reducer earlier for lower latency in a N-mapper -> 1 reducer case.
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