[HADOOP-1647] DistributedFileSystem.getFileStatus() fails for path "/"

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.14.0, 0.15.0
• Fix Version/s: 0.14.0
• Assignee: Dhruba Borthakur
• Reporter: Enis Soztutar
• Created: 23/Jul/07 14:37
• Updated: 02/May/13 02:29
• Resolved: 31/Jul/07 19:17

Description

DistributedFileSystem#getFileStatus throws the following exception when invoked with new Path("/"). LocalFileSystem does not. The code to produce this error is

 public static void main(String[] args) throws Exception{
    Configuration conf = new Configuration();
    FileSystem fs = FileSystem.get(conf);
    Path path = new Path("/");
    System.out.println("Path : \"" + path.toString() + "\"");
    System.out.println(fs.isDirectory(path));
    System.out.println(fs.getFileStatus(path).isDir()); 
  }

for Local configuration the code prints :

Path : "/"
true
true

For a new formatted dfs with only one file /user/enis/file.txt, Path could not be created.

Path : "/"
false
Exception in thread "main" org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.lang.IllegalArgumentException: Can not create a Path from an empty string
        at org.apache.hadoop.fs.Path.checkPathArg(Path.java:82)
        at org.apache.hadoop.fs.Path.<init>(Path.java:90)
        at org.apache.hadoop.dfs.DFSFileInfo.<init>(DFSFileInfo.java:59)
        at org.apache.hadoop.dfs.FSDirectory.getFileInfo(FSDirectory.java:729)
        at org.apache.hadoop.dfs.FSNamesystem.getFileInfo(FSNamesystem.java:1301)
        at org.apache.hadoop.dfs.NameNode.getFileInfo(NameNode.java:488)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)

        at org.apache.hadoop.ipc.Client.call(Client.java:470)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:165)
        at org.apache.hadoop.dfs.$Proxy0.getFileInfo(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
        at org.apache.hadoop.dfs.$Proxy0.getFileInfo(Unknown Source)
        at org.apache.hadoop.dfs.DFSClient.getFileInfo(DFSClient.java:430)
        at org.apache.hadoop.dfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:319)
        at org.apache.hadoop.util.TestIsDir.main(TestIsDir.java:38)

Issue Links

• is blocked by: HADOOP-1653 FSDirectory class code cleanup
• is depended upon by: HADOOP-1621 Make FileStatus a concrete class