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Hadoop JobTracker and NameNode configuration error: FileNotFoundException jobToken

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FYI for anyone running into java.io.FileNotFoundException: File file:/tmp/hadoop-USER/mapred/system/JOBID/jobToken does not exist. when running Hadoop MapReduce jobs. Your JobTracker needs access to an HDFS NameNode to share information with TaskTrackers. If the JobTracker is misconfigured and cannot connect to a NameNode it will write to local disk instead. Or at least it will in hadoop-1.0.1. The [...]

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