KevinWikant commented on a change in pull request #3675:
URL: https://github.com/apache/hadoop/pull/3675#discussion_r774293315
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.java
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@@ -189,6 +190,29 @@ 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. "
Review comment:
updated as per the recommendation
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