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https://issues.apache.org/jira/browse/HDFS-4450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13565963#comment-13565963
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Suresh Srinivas commented on HDFS-4450:
---------------------------------------
This is working as expected. The two instances of datanodes are different. On
restart of the namenode the previous instance of datanode will no longer be
tracked/show on web UI by the namenode.
> 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
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Duplicate data node on the name node after formatting data node。
> When we registered data node，use nodeReg.getXferPort() to find
> DatanodeDescriptor.
> {code}
> DatanodeDescriptor nodeN = host2DatanodeMap.getDatanodeByXferAddr(
> nodeReg.getIpAddr(), nodeReg.getXferPort());
> {code}
> but add data node use node.getIpAddr().
> {code}
> /** add node to the map
> * return true if the node is added; false otherwise.
> */
> boolean add(DatanodeDescriptor node) {
> hostmapLock.writeLock().lock();
> try {
> if (node==null || contains(node)) {
> return false;
> }
>
> String ipAddr = node.getIpAddr();
> DatanodeDescriptor[] nodes = map.get(ipAddr);
> DatanodeDescriptor[] newNodes;
> if (nodes==null) {
> newNodes = new DatanodeDescriptor[1];
> newNodes[0]=node;
> } else { // rare case: more than one datanode on the host
> newNodes = new DatanodeDescriptor[nodes.length+1];
> System.arraycopy(nodes, 0, newNodes, 0, nodes.length);
> newNodes[nodes.length] = node;
> }
> map.put(ipAddr, newNodes);
> return true;
> } finally {
> hostmapLock.writeLock().unlock();
> }
> }
> {code}
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