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https://issues.apache.org/jira/browse/HADOOP-8504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293733#comment-13293733
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Colin Patrick McCabe commented on HADOOP-8504:
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Hi Mithun,
Can you give some more information about the problem? For example, could you
attach an example FSImage that triggers the bug?
Also, does TestOfflineEditsViewer run correctly for you?
> OfflineImageViewer throws an NPE
> --------------------------------
>
> Key: HADOOP-8504
> URL: https://issues.apache.org/jira/browse/HADOOP-8504
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.23.3
> Reporter: Ravi Prakash
> Assignee: Colin Patrick McCabe
>
> Courtesy [~mithun]
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.hadoop.security.authentication.util.KerberosName.getShortName(KerberosName.java:371)
> at org.apache.hadoop.security.User.<init>(User.java:48)
> at org.apache.hadoop.security.User.<init>(User.java:43)
> at
> org.apache.hadoop.security.UserGroupInformation.createRemoteUser(UserGroupInformation.java:857)
> at
> org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier.getUser(AbstractDelegationTokenIdentifier.java:91)
> at
> org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier.toString(DelegationTokenIdentifier.java:61)
> at
> org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processDelegationTokens(ImageLoaderCurrent.java:222)
> at
> org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.loadImage(ImageLoaderCurrent.java:185)
> at
> org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewer.go(OfflineImageViewer.java:129)
> at
> org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewer.main(OfflineImageViewer.java:250)
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