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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1336) turn on speculative execution by defaul
Date Sat, 15 Dec 2007 13:36:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12552074
] 

Runping Qi commented on HADOOP-1336:
------------------------------------


Speculative execution does not work well without the patch for hadoop-1281.

With that fix, the speculative should well, and should be on by default. It does no harm
to normal jobs that do not involve side effects such as  writing files to dfs.
The users of these jobs can choose to turn it off.


> turn on speculative execution by defaul
> ---------------------------------------
>
>                 Key: HADOOP-1336
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1336
>             Project: Hadoop
>          Issue Type: Task
>          Components: mapred
>    Affects Versions: 0.12.3
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.14.0
>
>         Attachments: spec-exec.patch
>
>
> Now that speculative execution is working again, we should enable it by default.

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