[HDFS-8627] NPE thrown if unable to fetch token from Namenode

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha1
• Hadoop Flags: Reviewed
• Assignee: J.Andreina
• Reporter: J.Andreina
• Created: 18/Jun/15 10:49
• Updated: 12/May/16 18:18
• Resolved: 30/Jun/15 10:14

Description

DelegationTokenFetcher#saveDelegationToken
Missed to check if token is null.

    Token<?> token = fs.getDelegationToken(renewer);
    Credentials cred = new Credentials();
    cred.addToken(token.getKind(), token);

XXXXXXXXXXXXXXXXXX:~/hadoop/namenode/bin> ./hdfs fetchdt --renewer Rex /home/REX/file1
Exception in thread "main" java.lang.NullPointerException
        at org.apache.hadoop.hdfs.tools.DelegationTokenFetcher.saveDelegationToken(DelegationTokenFetcher.java:181)
        at org.apache.hadoop.hdfs.tools.DelegationTokenFetcher$1.run(DelegationTokenFetcher.java:126)
        at java.security.AccessController.doPrivileged(AccessController.java:314)
        at javax.security.auth.Subject.doAs(Subject.java:572)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1666)
        at org.apache.hadoop.hdfs.tools.DelegationTokenFetcher.main(DelegationTokenFetcher.java:114)