Arpit Agarwal created HDFS-7734:
-----------------------------------

             Summary: Class cast exception in NameNode#main
                 Key: HDFS-7734
                 URL: https://issues.apache.org/jira/browse/HDFS-7734
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.7.0
            Reporter: Arpit Agarwal
            Priority: Blocker


NameNode hits the following exception immediately on startup.

{code}
15/02/03 15:50:25 ERROR namenode.NameNode: Failed to start namenode.
java.lang.ClassCastException: org.apache.log4j.Logger cannot be cast to 
org.apache.commons.logging.Log
        at 
org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1557)
15/02/03 15:50:25 INFO util.ExitUtil: Exiting with status 1
{code}

Location of the exception in NameNode.java:
{code}
  public static void main(String argv[]) throws Exception {
    if (DFSUtil.parseHelpArgument(argv, NameNode.USAGE, System.out, true)) {
      System.exit(0);
    }

    try {
      StringUtils.startupShutdownMessage(NameNode.class, argv,
          (org.apache.commons.logging.Log) 
LogManager.getLogger(LOG.getName()));   <<<<< Failed here.
{code}




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