[HDFS-9100] HDFS Balancer does not respect dfs.client.use.datanode.hostname

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: balancer & mover
• Hadoop Flags: Reviewed
• Assignee: Casey Brotherton
• Reporter: Yongjun Zhang
• Created: 17/Sep/15 23:04
• Updated: 30/Aug/16 01:27
• Resolved: 02/Oct/15 19:15

Description

In Balancer Dispatch.java:

   private void dispatch() {
      LOG.info("Start moving " + this);

      Socket sock = new Socket();
      DataOutputStream out = null;
      DataInputStream in = null;
      try {
        sock.connect(
            NetUtils.createSocketAddr(target.getDatanodeInfo().getXferAddr()),
            HdfsConstants.READ_TIMEOUT);

getXferAddr() is called without taking into consideration of dfs.client.use.datanode.hostname setting, this would possibly fail balancer run issued from outside a cluster.

Thanks Casey Brotherton for reporting the issue.