ivandika3 commented on code in PR #9926:
URL: https://github.com/apache/ozone/pull/9926#discussion_r2945845042
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hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/DeadNodeHandler.java:
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@@ -119,15 +119,24 @@ public void onMessage(final DatanodeDetails
datanodeDetails,
deletedBlockLog.onDatanodeDead(datanodeDetails.getID());
}
- //move dead datanode out of ClusterNetworkTopology
- NetworkTopology nt = nodeManager.getClusterNetworkTopologyMap();
- if (nt.contains(datanodeDetails)) {
- nt.remove(datanodeDetails);
- //make sure after DN is removed from topology,
- //DatanodeDetails instance returned from nodeStateManager has no
parent.
- Preconditions.checkState(
- nodeManager.getNode(datanodeDetails.getID())
- .getParent() == null);
+ // Only remove from topology if the node is still DEAD. Between the time
+ // the DEAD_NODE event was fired and now, the node may have been
+ // resurrected (DEAD -> HEALTHY_READONLY) via a heartbeat. Removing a
+ // resurrected node from the topology would leave it reachable but
+ // invisible to the placement policy.
+ NodeStatus currentStatus =
+ nodeManager.getNodeStatus(datanodeDetails);
+ if (currentStatus.getHealth() == HddsProtos.NodeState.DEAD) {
Review Comment:
Good point, I added another check at the start. Technically, we need to do
each check before doing any of these actions, but seems to be overkill.
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