[jira] [Created] (HDFS-8627) NPE thrown if unable to fetch token from Namenode

["J.Andreina (JIRA)" <ji...@apache.org>]

J.Andreina created HDFS-8627:
--------------------------------

             Summary: NPE thrown if unable to fetch token from Namenode
                 Key: HDFS-8627
                 URL: https://issues.apache.org/jira/browse/HDFS-8627
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: J.Andreina
            Assignee: J.Andreina


DelegationTokenFetcher#saveDelegationToken
Missed to check if token is null.

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

{noformat}
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)
{noformat}



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