Why hdfs dfs -setrep -w 2 / keeps waiting?

[#1]

In my hadoop system, there are some files which are under replicated.

hdfs dfs -setrep -w 2 /user/oozie/tmp/test2/workflow.xml

Waiting for /user/oozie/tmp/test2/workflow.xml..............................................................................................................................................................................................................................
I wait the whole day, but it keeps waiting. it its a small file.

this is my env:

and I use fsck and recoverLease, but not helpful.

Why hdfs dfs -setrep -w 2 / keeps waiting?

[#2]

Can you run fsck with -blocks option to get the datanode address. 

hadoop fsck /user/oozie/tmp/test2/workflow.xml -files -blocks 

Login to the datanode and check/grep for that particular blockId/filename on the datanode log. Also grep for blockId/filename on the namenode log.