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MapReduce >> mail # user >> HDFS Errors



On Jun 22, 2010, at 12:55 PM, Steve Lewis wrote:
> /user/training/small_yeast/yeast_chrXIV00000006.sam.gz could only be replicated to 0 nodes, instead of 1

... almost always means the namenode doesn't think it has any viable datanodes (anymore).

> Anyone seen this and know how to fix it
>  I am on a 4 node virtual cloudera cluster

Check the namenode UI and see if it is in safemode, how many live datanodes you have, etc.