[jira] [Created] (HDFS-10296) FileContext.getDelegationTokens() fails to obtain KMS delegation token

["Andreas Neumann (JIRA)" <ji...@apache.org>]

Andreas Neumann created HDFS-10296:
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             Summary: FileContext.getDelegationTokens() fails to obtain KMS delegation token
                 Key: HDFS-10296
                 URL: https://issues.apache.org/jira/browse/HDFS-10296
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: encryption
    Affects Versions: 2.6.0
         Environment: CDH 5.6 with a Java KMS
            Reporter: Andreas Neumann


This little program demonstrates the problem: With FileSystem, we can get both the HDFS and the kms-dt token, whereas with FileContext, we can only obtain the HDFS delegation token. 

{code}
public class SimpleTest {

  public static void main(String[] args) throws IOException {
    YarnConfiguration hConf = new YarnConfiguration();
    String renewer = "renewer";

    FileContext fc = FileContext.getFileContext(hConf);
    List<Token<?>> tokens = fc.getDelegationTokens(new Path("/"), renewer);
    for (Token<?> token : tokens) {
      System.out.println("Token from FC: " + token);
    }

    FileSystem fs = FileSystem.get(hConf);
    for (Token<?> token : fs.addDelegationTokens(renewer, new Credentials())) {
      System.out.println("Token from FS: " + token);
    }
  }
}
{code}
Sample output (host/user name x'ed out):
{noformat}
Token from FC: Kind: HDFS_DELEGATION_TOKEN, Service: ha-hdfs:xxx, Ident: (HDFS_DELEGATION_TOKEN token 49 for xxx)
Token from FS: Kind: HDFS_DELEGATION_TOKEN, Service: ha-hdfs:xxx, Ident: (HDFS_DELEGATION_TOKEN token 50 for xxx)
Token from FS: Kind: kms-dt, Service: xx.xx.xx.xx:16000, Ident: 00 04 63 64 61 70 07 72 65 6e 65 77 65 72 00 8a 01 54 16 96 c2 95 8a 01 54 3a a3 46 95 0e 02
{noformat}
Apparently FileContext does not return the KMS token. 



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