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https://issues.apache.org/jira/browse/HADOOP-12253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15089345#comment-15089345
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Steve Loughran commented on HADOOP-12253:
-----------------------------------------
Looking at this code, {{ugi.getGroupNames().length < 1 ? null :
ugi.getGroupNames()[0];}} re-occurs in 3 places. It should be factored out into
some method called "getFirstGroup(ugi)". Make it static and you can then add
the test that this patch needs
> 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
> Attachments: HADOOP-12253.patch
>
>
> When I enable hdfs federation.I run a query on hive on tez. Then it occur a
> exception:
> {noformat}
> 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)
> {noformat}
> I digging into the issue,I found the code snippet in ViewFileSystem.java as
> follows:
> {noformat}
> @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));
> }
> {noformat}
> 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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