Clouder Manager fails to start HDFS

[#1]

Encountered the following after restarting a cluster running on EC2.  The shutdown was not graceful.   The "permission denied" seems to conflict with "FileNotFoundException"  

All other rolls start up healthy.

thx

Failed to start namenode.
java.io.FileNotFoundException: /data0/dfs/nn/current/VERSION (Permission denied)
	at java.io.RandomAccessFile.open(Native Method)
	at java.io.RandomAccessFile.<init>(RandomAccessFile.java:241)
	at org.apache.hadoop.hdfs.server.common.StorageInfo.readPropertiesFile(StorageInfo.java:245)
	at org.apache.hadoop.hdfs.server.common.StorageInfo.readProperties(StorageInfo.java:231)
	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverStorageDirs(FSImage.java:325)
	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:202)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1006)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:736)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:531)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:587)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:754)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:738)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1427)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1493)

[#2]

Please verify if the VERSION file is available and readable by the hdfs
user. If yes then what are the contents?

[#3 · Accepted solution]

I rebuilt it from scratch.  The cause was an improper shutdown.  I'll open a new thread if I encounter the same problem again.

[#4]

The same problem after reboot. How rebuilt from scratch?