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Posted to issues@tez.apache.org by "Hitesh Shah (JIRA)" <ji...@apache.org> on 2015/05/06 03:16:01 UTC

[jira] [Updated] (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:all-tabpanel ]

Hitesh Shah updated TEZ-1248:
-----------------------------
    Target Version/s: 0.8.0  (was: 0.7.0)

> 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
>            Priority: Minor
>
> 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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