ChenSammi commented on a change in pull request #937: HDDS-1663. Add datanode
to network topology cluster during node regis…
URL: https://github.com/apache/hadoop/pull/937#discussion_r292258974
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/SCMNodeManager.java
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@@ -515,5 +551,36 @@ public void onMessage(CommandForDatanode
commandForDatanode,
return commandQueue.getCommand(dnID);
}
+ /**
+ * Given datanode address or host name, returns the DatanodeDetails for the
+ * node.
+ *
+ * @param address node host address
+ * @return the given datanode, or null if not found
+ */
+ @Override
+ public DatanodeDetails getNode(String address) {
+ Node node = null;
+ String location = nodeResolve(address);
+ if (location != null) {
+ node = clusterMap.getNode(location + NetConstants.PATH_SEPARATOR_STR +
+ address);
+ }
+ return node == null ? null : (DatanodeDetails)node;
+ }
+ private String nodeResolve(String hostname) {
+ List<String> hosts = new ArrayList<>(1);
+ hosts.add(hostname);
+ List<String> resolvedHosts = dnsToSwitchMapping.resolve(hosts);
+ if (resolvedHosts != null && !resolvedHosts.isEmpty()) {
+ String location = resolvedHosts.get(0);
Review comment:
It will not return null so far. If no match found,
dnsToSwitchMapping.resolve will return /default-rack.
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