virajjasani commented on PR #5396:
URL: https://github.com/apache/hadoop/pull/5396#issuecomment-1433649342
Yes, we do have check at namenode side:
```
@Override // NameNodeMXBean
public String getDeadNodes() {
final Map<String, Map<String, Object>> info =
new HashMap<String, Map<String, Object>>();
final List<DatanodeDescriptor> dead = new
ArrayList<DatanodeDescriptor>();
blockManager.getDatanodeManager().fetchDatanodes(null, dead, false);
for (DatanodeDescriptor node : dead) {
...
...
...
```
I am thinking more about `getDataNodeStats()` API
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