public void cancelDelegationToken(String tokenStrForm)
    throws HiveException {
    try {
      getMSC().cancelDelegationToken(tokenStrForm);
    }  catch(Exception e) {
      LOG.error("Failed cancelDelegationToken", e);
      throw new HiveException(e);
    }
  }
@return the metastore client for the current thread
@throws MetaException
ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java