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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1542) Speculative execution used when property set to false
Date Thu, 28 Jun 2007 05:02:26 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nigel Daley updated HADOOP-1542:
--------------------------------

    Attachment: jobtracker.log

Here's the jobtracker log.  Follow the life cycle of task_0005_m_000004.  This is a TestDFSIO
map task that should be writing data.

Note that task_0005_m_000004_1 is created right after task_0005_m_000004_0 even though speculative
execution should be off.  task_0005_m_000004_0 seems to complete fine (task_0005_m_000004_1
fails with AlreadyBeingCreatedException -- see namenode.log) but the file it creates (/benchmarks/TestDFSIO/io_data/test_io_12)
seems to get 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
>
>
> 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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