Fix Under-replicated blocks in HDFS manually

https://community.hortonworks.com/articles/4427/fix-under-replicated-blocks-in-hdfs-manually.html

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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###

1. su – <$hdfs_user>
2. bash–4.1$ hdfs fsck / | grep ‘Under replicated’ | awk –F‘:’ ‘{print $1}’ >> /tmp/under_replicated_files
3. –bash–4.1$ for hdfsfile in `cat /tmp/under_replicated_files`; do echo “Fixing $hdfsfile :” ; hadoop fs –setrep 3 $hdfsfile; done