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https://issues.apache.org/jira/browse/HADOOP-14607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066527#comment-16066527
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Kihwal Lee commented on HADOOP-14607:
-------------------------------------
{code:java}
@Override // NameNodeMXBean
public String getLiveNodes() {
final Map<String, Map<String,Object>> info =
new HashMap<String, Map<String,Object>>();
final List<DatanodeDescriptor> live = new ArrayList<DatanodeDescriptor>();
blockManager.getDatanodeManager().fetchDatanodes(live, null, false);
for (DatanodeDescriptor node : live) {
ImmutableMap.Builder<String, Object> innerinfo =
ImmutableMap.<String,Object>builder();
innerinfo
.put("infoAddr", node.getInfoAddr())
.put("infoSecureAddr", node.getInfoSecureAddr())
.put("xferaddr", node.getXferAddr())
.put("lastContact", getLastContact(node))
.put("usedSpace", getDfsUsed(node))
.put("adminState", node.getAdminState().toString())
.put("nonDfsUsedSpace", node.getNonDfsUsed())
.put("capacity", node.getCapacity())
.put("numBlocks", node.numBlocks())
.put("version", node.getSoftwareVersion())
....
{code}
{{FSNamesystem.java:7108}} corresponds to {{.put("version",
node.getSoftwareVersion())}}. The software version is supposed to be set on
registration.
> NPE while getting list of live nodes via jmx
> --------------------------------------------
>
> Key: HADOOP-14607
> URL: https://issues.apache.org/jira/browse/HADOOP-14607
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.7.3
> Reporter: Kihwal Lee
>
> I saw this back in February during an upgrade. A namenode was restarted and
> all nodes registered, but some didn't block reported. Clicking datanodes tab
> in the web UI wasn't working, but other UI components were working. This got
> resolved later on its own.
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