Prabhu Joseph created HDFS-16675:
------------------------------------
Summary: DatanodeAdminManager.stopDecommission fails with
ConcurrentModificationException
Key: HDFS-16675
URL: https://issues.apache.org/jira/browse/HDFS-16675
Project: Hadoop HDFS
Issue Type: Bug
Components: namanode
Affects Versions: 3.2.1
Reporter: Prabhu Joseph
Assignee: Prabhu Joseph
DatanodeAdminManager.stopDecommission intermittently fails with
ConcurrentModificationException.
{code}
java.util.ConcurrentModificationException: Tree has been modified outside of
iterator
at
org.apache.hadoop.hdfs.util.FoldedTreeSet$TreeSetIterator.checkForModification(FoldedTreeSet.java:311)
at
org.apache.hadoop.hdfs.util.FoldedTreeSet$TreeSetIterator.hasNext(FoldedTreeSet.java:256)
at
org.apache.hadoop.hdfs.util.FoldedTreeSet$TreeSetIterator.next(FoldedTreeSet.java:262)
at
java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1044)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processExtraRedundancyBlocksOnInService(BlockManager.java:4300)
at
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager.stopDecommission(DatanodeAdminManager.java:241)
{code}
This is intermittently seen on busy cluster with AutoScale Enabled. This leads
to a Node with state "IN Service" in pendingNodes queue
{code}
2022-07-21 06:54:38,562 WARN
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager
(DatanodeAdminMonitor-0): DatanodeAdminMonitor caught exception when processing
node 1.2.3.4:9866.
java.lang.IllegalStateException: Node 1.2.3.4:9866 is in an invalid state!
Invalid state: In Service 0 blocks are on this dn.
at
com.google.common.base.Preconditions.checkState(Preconditions.java:172)
at
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager$Monitor.check(DatanodeAdminManager.java:601)
at
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager$Monitor.run(DatanodeAdminManager.java:504)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
{code}
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