FileCrush replacement format

Error message:
-bash: --replacement=$1-${crush.timestamp}-${crush.task.num}-${crush.file.num}: bad substitution

Fix by using escape character in bash:
--replacement=\$1-\$\{crush.timestamp\}-\$\{crush.task.num\}-\$\{crush.file.num\}

Parse hosts file in Fabric

Add the following code to your fabfile.py

The "hosts_file" support comment and host sequence:
$ cat hosts_file
# This is comment. using # asprefix
hadoopdev01
hadoopprod[01-10]
#hadoopdev02
192.168.1.[1-200]