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From "ZhuGuanyin (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1254) job.xml should add crc check in tasktracker and sub jvm.
Date Tue, 01 Dec 2009 03:07:29 GMT
job.xml should add crc check in tasktracker and sub jvm.
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                 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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