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Posted to common-dev@hadoop.apache.org by "Nigel Daley (JIRA)" <ji...@apache.org> on 2007/06/28 07:22:26 UTC
[jira] Commented: (HADOOP-1542) Speculative execution used when
property set to false
[ https://issues.apache.org/jira/browse/HADOOP-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12508733 ]
Nigel Daley commented on HADOOP-1542:
-------------------------------------
Is it possible that setting speculation off in mapred-default.xml on my job submission host has no effect and that i really need to set it off in hadoop-site.xml?
If that is the case, then speculation would be on -- which explains perfectly the immediate execution of task_0005_m_000004_1. In which case this should be filed as a dfs bug since the file created by the first map (task_0005_m_000004_0) is getting lost.
> Speculative execution used when property set to false
> -----------------------------------------------------
>
> Key: HADOOP-1542
> URL: https://issues.apache.org/jira/browse/HADOOP-1542
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Reporter: Nigel Daley
> Attachments: jobtracker.log, namenode.log
>
>
> Speculative execution is now on by default. When running TestDFSIO, I set speculative execution off in my mapred-default.xml since this test has maps that create files in DFS (side-effects).
> However, it seems that speculative tasks get started even though I have set speculation off. I'll attached the NN and JT logs.
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