aajisaka commented on a change in pull request #3675:
URL: https://github.com/apache/hadoop/pull/3675#discussion_r770274630
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.java
##########
@@ -189,6 +190,30 @@ public void run() {
* node will be removed from tracking by the pending cancel.
*/
processCancelledNodes();
+
+ // Having more nodes decommissioning than can be tracked will impact
decommissioning
+ // performance due to queueing delay
+ int numTrackedNodes = outOfServiceNodeBlocks.size();
+ int numQueuedNodes = getPendingNodes().size();
+ int numDecommissioningNodes = numTrackedNodes + numQueuedNodes;
+ if (numDecommissioningNodes > maxConcurrentTrackedNodes) {
+ LOG.warn(
+ "There are {} nodes decommissioning but only {} nodes will be
tracked at a time. "
+ + "{} nodes are currently queued waiting to be
decommissioned.",
+ numDecommissioningNodes, maxConcurrentTrackedNodes,
numQueuedNodes);
+
+ // Re-queue unhealthy nodes to make space for decommissioning
healthy nodes
+ final List<DatanodeDescriptor> unhealthyDns =
outOfServiceNodeBlocks.keySet().stream()
+ .filter(dn ->
!blockManager.isNodeHealthyForDecommissionOrMaintenance(dn))
+ .collect(Collectors.toList());
+ final List<DatanodeDescriptor> toRequeue =
+ identifyUnhealthyNodesToRequeue(unhealthyDns,
numDecommissioningNodes);
+ for (DatanodeDescriptor dn : toRequeue) {
+ getPendingNodes().add(dn);
+ outOfServiceNodeBlocks.remove(dn);
Review comment:
Agreed. Thank you for your update.
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