tomscut commented on pull request #3928:
URL: https://github.com/apache/hadoop/pull/3928#issuecomment-1023138606
Hi @sodonnel , thanks for your comments.
This is the stack:
```
2021-12-21 16:56:21,203 INFO namenode.FSNamesystem
(FSNamesystemLock.java:readUnlock(220)) - FSNamesystem scanDatanodeStorage read
lock held for 16013 ms via
java.lang.Thread.getStackTrace(Thread.java:1552)
org.apache.hadoop.util.StringUtils.getStackTrace(StringUtils.java:1032)
org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.readUnlock(FSNamesystemLock.java:222)
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.readUnlock(FSNamesystem.java:1641)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.scanDatanodeStorage(DatanodeAdminBackoffMonitor.java:646)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.checkForCompletedNodes(DatanodeAdminBackoffMonitor.java:417)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.check(DatanodeAdminBackoffMonitor.java:300)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.run(DatanodeAdminBackoffMonitor.java:201)
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
Number of suppressed read-lock reports: 0
Longest read-lock held interval: 16013
```
I think this is at the end of decommission, because we can see
`checkForCompletedNodes`, `initialScan` must be false.
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