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Date: Tue, 29 Jan 2013 09:23:12 +0000 (UTC)
From: "MaWenJin (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.12629660.1359451296695.207366.1359451392595@arcas>
In-Reply-To: <JIRA.12629660.1359451296695@arcas>
References: <JIRA.12629660.1359451296695@arcas>
Subject: [jira] [Created] (HDFS-4450) Duplicate data node on the name node
 after formatting data node
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MaWenJin created HDFS-4450:
------------------------------

             Summary: Duplicate data node on the name node after formatting=
 data node
                 Key: HDFS-4450
                 URL: https://issues.apache.org/jira/browse/HDFS-4450
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.2-alpha
            Reporter: MaWenJin


Duplicate data node on the name node after formatting data node=E3=80=82
When we registered data node=EF=BC=8Cuse nodeReg.getXferPort() to find Data=
nodeDescriptor.
{code}
 DatanodeDescriptor nodeN =3D host2DatanodeMap.getDatanodeByXferAddr(
        nodeReg.getIpAddr(), nodeReg.getXferPort());
{code}

but add data node use node.getIpAddr().
{code}
    /** add node to the map=20
   * return true if the node is added; false otherwise.
   */
  boolean add(DatanodeDescriptor node) {
    hostmapLock.writeLock().lock();
    try {
      if (node=3D=3Dnull || contains(node)) {
        return false;
      }
     =20
      String ipAddr =3D node.getIpAddr();
      DatanodeDescriptor[] nodes =3D map.get(ipAddr);
      DatanodeDescriptor[] newNodes;
      if (nodes=3D=3Dnull) {
        newNodes =3D new DatanodeDescriptor[1];
        newNodes[0]=3Dnode;
      } else { // rare case: more than one datanode on the host
        newNodes =3D new DatanodeDescriptor[nodes.length+1];
        System.arraycopy(nodes, 0, newNodes, 0, nodes.length);
        newNodes[nodes.length] =3D node;
      }
      map.put(ipAddr, newNodes);
      return true;
    } finally {
      hostmapLock.writeLock().unlock();
    }
  }
{code}

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