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Re: NN stopped and cannot recover with error "There appears to be a gap in the edit log" - MapReduce - [mail # user]
...Maybe you can play with the "offline edits viewer". I have never run into such an issue, this I have never been playing with "offline edits viewer" on production datasets, but it has some op...
   Author: Adam Kawa, 2013-11-27, 23:55
Re: org.apache.hadoop.mapred.TaskTracker: Caught exception: java.net.UnknownHostException: Invalid host name: - MapReduce - [mail # user]
...As far as I remember (we might run into such a issue ~6 months ago), the TaskTracker can cache the hostname of JobTracker. Try to restart a TaskTrackers, to check if it connects correctly. P...
   Author: Adam Kawa, 2013-11-27, 23:48
Re: mapred.tasktacker.reduce.tasks.maximum issue - MapReduce - [mail # user]
...It looks that you have a typo in the names of configuration properties, so Hadoop ignores them and uses the default vaules (2 map and 2 reduce tasks per node).  it should mapred.*tasktr...
   Author: Adam Kawa, 2013-11-27, 23:43
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