You mentioned that you still need to fix the 'Under-Replicated Blocks'.   This is what I found with google to fix:   $ su - <$hdfs_user>  $ hdfs fsck / | grep 'Under replicated' | awk -F':' '{print $1}' >> /tmp/under_replicated_files $ for hdfsfile in `cat /tmp/under_replicated_files`; do echo "Fixing $hdfsfile :" ; hadoop fs -setrep 3 $hdfsfile; done   ... View more