FAQ
throws an IOException that it couldn't create the file, but doesn't give specific details
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Key: HDFS-1913
URL: https://issues.apache.org/jira/browse/HDFS-1913
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs client
Affects Versions: 0.20.2
Reporter: Kate Ting


It would be a lot more useful to print an error message indicating why that you can't create the file - e.g. can't create a directory with the name of the file you're trying to write to.

Also, the log file isn't much better. You'll see exceptions that look like this:
2011-04-14 12:29:37,757 WARN org.apache.hadoop.security.ShellBasedUnixGroupsMapping: got exception trying to get groups for user ___
org.apache.hadoop.util.Shell$ExitCodeException: id: ___: No such user
at org.apache.hadoop.util.Shell.runCommand(Shell.java:255)
at org.apache.hadoop.util.Shell.run(Shell.java:182)
at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:375) at org.apache.hadoop.util.Shell.execCommand(Shell.java:461)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:444) at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getUnixGroups(ShellBasedUnixGroupsMapping.java:66)
at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getGroups(ShellBasedUnixGroupsMapping.java:43)
at org.apache.hadoop.security.Groups.getGroups(Groups.java:79)
at org.apache.hadoop.security.UserGroupInformation.getGroupNames(UserGroupInformation.java:1022)
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.(FSNamesystem.java:4920)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkTraverse(FSNamesystem.java:4903)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getFileInfo(FSNamesystem.java:1878)
at org.apache.hadoop.hdfs.server.namenode.NameNode.getFileInfo(NameNode.java:795)
at sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1416)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1412)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1410)

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postedMay 10, '11 at 10:20p
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