[jira] Commented: (MAPREDUCE-1254) job.xml should add crc check in tasktracker and sub jvm.

["Zheng Shao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785788#action_12785788 ] 

Zheng Shao commented on MAPREDUCE-1254:
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Can you explain why the sub task jvm will continue if it doesn't successfully load the job.xml?
Shouldn't it error out with an IOException?


> job.xml should add crc check in tasktracker and sub jvm.
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-1254
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1254
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: task, tasktracker
>    Affects Versions: 0.22.0
>            Reporter: ZhuGuanyin
>
> Currently job.xml in tasktracker and subjvm are write to local disk through ChecksumFilesystem, and already had crc checksum information, but load the job.xml file without crc check. It would cause the mapred job finished successful but with wrong data because of disk error.  Example: The tasktracker and sub task jvm would load the default configuration if it doesn't successfully load the job.xml which maybe replace the mapper with IdentityMapper. 

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