in ambari dashboard we have HDFS Disk usage 100%
so we decided to decrease the Block replication from 3 to 2 , in order to free space
then we restart the HDFS service
but the HDFS Disk usage on ambari dashboard , still have 100%
do we miss here something
why HDFS isn't get free , regarding that we decrease the replication Block from 3 to 2?