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From "Yong Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12253) ViewFileSystem getFileStatus java.lang.ArrayIndexOutOfBoundsException: 0
Date Wed, 22 Jul 2015 06:51:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636388#comment-14636388
] 

Yong Zhang commented on HADOOP-12253:
-------------------------------------

I do not think it is HDFS issue, you must make sure your environment is fine when you run
anything.

> ViewFileSystem getFileStatus java.lang.ArrayIndexOutOfBoundsException: 0
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-12253
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12253
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.6.0
>         Environment: hadoop 2.6.0   hive 1.1.0 tez0.7  cenos6.4
>            Reporter: tangjunjie
>            Assignee: Ajith S
>
> When I enable hdfs federation.I run a query on hive on tez. Then it occur a exception:
> 8.784 PM	WARN	org.apache.hadoop.security.UserGroupInformation	No groups available for
user tangjijun
> 3:12:28.784 PM	ERROR	org.apache.hadoop.hive.ql.exec.Task	
> Failed to execute tez graph.
> java.lang.ArrayIndexOutOfBoundsException: 0
> 	at org.apache.hadoop.fs.viewfs.ViewFileSystem$InternalDirOfViewFs.getFileStatus(ViewFileSystem.java:771)
> 	at org.apache.hadoop.fs.viewfs.ViewFileSystem.getFileStatus(ViewFileSystem.java:359)
> 	at org.apache.tez.client.TezClientUtils.checkAncestorPermissionsForAllUsers(TezClientUtils.java:955)
> 	at org.apache.tez.client.TezClientUtils.setupTezJarsLocalResources(TezClientUtils.java:184)
> 	at org.apache.tez.client.TezClient.getTezJarResources(TezClient.java:787)
> 	at org.apache.tez.client.TezClient.start(TezClient.java:337)
> 	at org.apache.hadoop.hive.ql.exec.tez.TezSessionState.open(TezSessionState.java:191)
> 	at org.apache.hadoop.hive.ql.exec.tez.TezTask.updateSession(TezTask.java:234)
> 	at org.apache.hadoop.hive.ql.exec.tez.TezTask.execute(TezTask.java:136)
> 	at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:160)
> 	at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:88)
> 	at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1640)
> 	at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1399)
> 	at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1183)
> 	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1049)
> 	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1044)
> 	at org.apache.hive.service.cli.operation.SQLOperation.runQuery(SQLOperation.java:144)
> 	at org.apache.hive.service.cli.operation.SQLOperation.access$100(SQLOperation.java:69)
> 	at org.apache.hive.service.cli.operation.SQLOperation$1$1.run(SQLOperation.java:196)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:415)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1671)
> 	at org.apache.hive.service.cli.operation.SQLOperation$1.run(SQLOperation.java:208)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:745)
> I digging into the issue,I found the code snippet in ViewFileSystem.java as follows:
>  @Override
>     public FileStatus getFileStatus(Path f) throws IOException {
>       checkPathIsSlash(f);
>       return new FileStatus(0, true, 0, 0, creationTime, creationTime,
>           PERMISSION_555, ugi.getUserName(), ugi.getGroupNames()[0],
>           new Path(theInternalDir.fullPath).makeQualified(
>               myUri, ROOT_PATH));
>     }
> If the node in cluster  haven't creat user like tangjijun,ugi.getGroupNames()[0]  will
throw ArrayIndexOutOfBoundsException.Because no user mean no group.
> I create user tangjijun on that node. Then the job was executed normally.
> I think this code should check  ugi.getGroupNames() is empty.When it is empty ,then print
some log. Not to throw exception.



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