https://community.cloudera.com/t5/Support-Questions/How-to-reduce-the-replication-factor-in-a-HDFS-directory-and/m-p/189171#M151264 <P>1 . First you need to run hadoop fsck / to check the under-replicated blocks. Then you can run hadoop -setrep 2 to the files which are under-replicated. This will stop the process.</P><P>2. Yes it will remove the third copy.</P> Wed, 19 Jul 2017 14:52:53 GMT chennuri_gouris 2017-07-19T14:52:53Z