Description
In DFSAdmin.java, '\n' should be added at the end of the line
+ " prepare: prepare a new rolling upgrade."
to clean up the following help message.
$ hdfs dfsadmin -help rollingUpgrade
-rollingUpgrade [<query|prepare|finalize>]:
query: query the current rolling upgrade status.
prepare: prepare a new rolling upgrade. finalize: finalize the current rolling upgrade.