Fix Under-replicated blocks in HDFS manually

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Quick instruction to fix under-replicated Blocks in HDFS manually

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To Fix under-replicated blocks in HDFS, below is quick instruction to use:

Fix under-replicated blocks###

su - <$hdfs_user>
 
bash-4.1$ hdfs fsck / | grep 'Under replicated' | awk -F':' '{print $1}' >> /tmp/under_replicated_files 
 
-bash-4.1$ for hdfsfile in `cat /tmp/under_replicated_files`; do echo "Fixing $hdfsfile :" ;  hadoop fs -setrep 3 $hdfsfile; done