[jira] [Created] (HDFS-5512) CacheAdmin -listPools fails with NPE when user lacks permissions to view all pools

["Stephen Chu (JIRA)" <ji...@apache.org>]

Stephen Chu created HDFS-5512:
---------------------------------

             Summary: CacheAdmin -listPools fails with NPE when user lacks permissions to view all pools
                 Key: HDFS-5512
                 URL: https://issues.apache.org/jira/browse/HDFS-5512
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: tools
    Affects Versions: 3.0.0
            Reporter: Stephen Chu


https://issues.apache.org/jira/browse/HDFS-5471 (CacheAdmin -listPools fails when user lacks permissions to view all pools) was recently resolved, but on a build with this fix, I am running into another error when using cacheadmin -listPools.

Now, when the user does not have permissions to view all the pools, the cacheadmin -listPools command will throw a NullPointerException.

On a system with a single pool "root" with a mode of 750, I see this as user schu:
{code}
[schu@hdfs-c5-nfs ~]$ hdfs cacheadmin -listPools
Exception in thread "main" java.lang.NullPointerException
	at org.apache.hadoop.hdfs.tools.CacheAdmin$ListCachePoolsCommand.run(CacheAdmin.java:745)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.run(CacheAdmin.java:82)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.main(CacheAdmin.java:87)
{code}

After we modify the root pool to 755, then -listPools works properly.
{code}
[schu@hdfs-c5-nfs ~]$ hdfs cacheadmin -listPools
Found 1 result.
NAME  OWNER  GROUP  MODE       WEIGHT 
root  root   root   rwxr-xr-x  100    
[schu@hdfs-c5-nfs ~]$ 
{code}



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