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From: "Stephen Chu (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-5513) CacheAdmin commands fail when using .
 as the path
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Stephen Chu created HDFS-5513:
---------------------------------

             Summary: CacheAdmin commands fail when using . as the path
                 Key: HDFS-5513
                 URL: https://issues.apache.org/jira/browse/HDFS-5513
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: tools
    Affects Versions: 3.0.0
            Reporter: Stephen Chu
            Priority: Minor


The hdfs CLI commands generally accept "." as a path argument.
e.g.
{code}
hdfs dfs -rm .
hdfs dfsadmin -allowSnapshot .
{code}

I don't think it's very common to use the path "." but the CacheAdmin commands will fail saying that it cannot create a Path from an empty string.

{code}
[schu@hdfs-c5-nfs ~]$ hdfs cacheadmin -removeDirectives -path .
Exception in thread "main" java.lang.IllegalArgumentException: Can not create a Path from an empty string
	at org.apache.hadoop.fs.Path.checkPathArg(Path.java:127)
	at org.apache.hadoop.fs.Path.<init>(Path.java:184)
	at org.apache.hadoop.hdfs.protocol.PathBasedCacheDirective$Builder.<init>(PathBasedCacheDirective.java:66)
	at org.apache.hadoop.hdfs.DistributedFileSystem.listPathBasedCacheDirectives(DistributedFileSystem.java:1639)
	at org.apache.hadoop.hdfs.tools.CacheAdmin$RemovePathBasedCacheDirectivesCommand.run(CacheAdmin.java:365)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.run(CacheAdmin.java:82)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.main(CacheAdmin.java:87)
[schu@hdfs-c5-nfs ~]$ hdfs cacheadmin -addDirective -path . -pool schu
Exception in thread "main" java.lang.IllegalArgumentException: Can not create a Path from an empty string
	at org.apache.hadoop.fs.Path.checkPathArg(Path.java:127)
	at org.apache.hadoop.fs.Path.<init>(Path.java:184)
	at org.apache.hadoop.hdfs.protocol.PathBasedCacheDirective$Builder.<init>(PathBasedCacheDirective.java:66)
	at org.apache.hadoop.hdfs.DistributedFileSystem.addPathBasedCacheDirective(DistributedFileSystem.java:1598)
	at org.apache.hadoop.hdfs.tools.CacheAdmin$AddPathBasedCacheDirectiveCommand.run(CacheAdmin.java:180)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.run(CacheAdmin.java:82)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.main(CacheAdmin.java:87)
{code}




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