could only be replicated to 0 nodes instead of minReplication exception during job execution

Hello, I am using YARN. I get some exceptions at my namenode and datanode. They are thrown when my Reduce progress gets 67%. Then, reduce phase is restarted from 0% several times, but always restarts at this point. Can someone tell me what I should do? Many thanks! Namenode log: 2013-06-24

Re: could only be replicated to 0 nodes instead of minReplication exception during job execution

Hi, I see there are 2 datanodes and for some reason namenode is not able to create even single replica for requested blocks. are you sure the system on which these datanodes are running have sufficient disk space? Do you see any other errors in datanode/namenode logs? What must be happening is