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I have setup a single node cluster on my desktop. Problem is i can’t keep my desktop running all the time. I do perform stop-all.sh, still later on when i perform start-all.sh , my namenode doesn’t start up. And finally i have to do %hadoop namenode -format , to continue there by loosing all my data.
Something is seriously wrong. Please check what happen with image and edits file written by namenode. If they are ok – NameNode can start.
Also… Last place to store NN data is HDFS – since you will get egg and chicken problem. W/o NN data HDFS is not accessible.