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https://issues.apache.org/jira/browse/HADOOP-1647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516755
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dhruba borthakur commented on HADOOP-1647:
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This patch is needed for 0.14. This patch depends on HADOOP-1653. So,
HADOOP-1653 also went into 0.14.
> DistributedFileSystem.getFileStatus() fails for path "/"
> --------------------------------------------------------
>
> Key: HADOOP-1647
> URL: https://issues.apache.org/jira/browse/HADOOP-1647
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.14.0, 0.15.0
> Reporter: Enis Soztutar
> Assignee: dhruba borthakur
> Priority: Blocker
> Fix For: 0.14.0, 0.15.0
>
> Attachments: fileStatus2.patch, getFileStatusJavadoc.patch
>
>
> DistributedFileSystem#getFileStatus throws the following exception when
> invoked with new Path("/"). LocalFileSystem does not. The code to produce
> this error is
> {code}
> 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());
> }
> {code}
> for Local configuration the code prints :
> {code}
> Path : "/"
> true
> true
> {code}
> For a new formatted dfs with only one file /user/enis/file.txt, Path could
> not be created.
> {code}
> 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)
> {code}
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