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https://issues.apache.org/jira/browse/HADOOP-16385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16875338#comment-16875338
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Íñigo Goiri commented on HADOOP-16385:
--------------------------------------
What about just returning null and don't let it return a node?
We prevent the RuntimeException and we increase the chances for catching this.
I would evne throw an exception but that might be too much.
> Namenode crashes with "RedundancyMonitor thread received Runtime exception"
> ---------------------------------------------------------------------------
>
> Key: HADOOP-16385
> URL: https://issues.apache.org/jira/browse/HADOOP-16385
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.1.1
> Reporter: krishna reddy
> Assignee: Ayush Saxena
> Priority: Major
> Attachments: HADOOP-16385-01.patch, HADOOP-16385-02.patch,
> HADOOP-16385.branch-3.1.001.patch
>
>
> *Description: *While removing dead nodes, Namenode went down with error
> "RedundancyMonitor thread received Runtime exception"
> *Environment: *
> Server OS :- UBUNTU
> No. of Cluster Node:- 1NN / 225DN's / 3ZK / 2RM/ 4850 NMs
> total 240 machines, in each machine 21 docker containers (1 DN & 20 NM's)
> *Steps:*
> 1. Total number of containers running state : ~53000
> 2. Because of the load, machine was going to outofMemory and restarting the
> machine and starting all the docker containers including NM's and DN's
> 3. in some point namenode throughs below error while removing a node and NN
> went down.
> {noformat}
> 2019-06-19 05:54:07,262 INFO org.apache.hadoop.net.NetworkTopology: Removing
> a node: /rack-1550/255.255.117.195:23735
> 2019-06-19 05:54:07,263 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> removeDeadDatanode: lost heartbeat from 255.255.117.151:23735,
> removeBlocksFromBlockMap true
> 2019-06-19 05:54:07,281 INFO org.apache.hadoop.net.NetworkTopology: Removing
> a node: /rack-4097/255.255.117.151:23735
> 2019-06-19 05:54:07,282 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> removeDeadDatanode: lost heartbeat from 255.255.116.213:23735,
> removeBlocksFromBlockMap true
> 2019-06-19 05:54:07,290 ERROR
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: RedundancyMonitor
> thread received Runtime exception.
> java.lang.IllegalArgumentException: 247 should >= 248, and both should be
> positive.
> at
> com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
> at
> org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:575)
> at
> org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:552)
> at
> org.apache.hadoop.hdfs.net.DFSNetworkTopology.chooseRandomWithStorageTypeTwoTrial(DFSNetworkTopology.java:122)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseDataNode(BlockPlacementPolicyDefault.java:873)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRandom(BlockPlacementPolicyDefault.java:770)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRemoteRack(BlockPlacementPolicyDefault.java:712)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTargetInOrder(BlockPlacementPolicyDefault.java:507)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:425)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTargets(BlockPlacementPolicyDefault.java:311)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:290)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:143)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy.chooseTarget(BlockPlacementPolicy.java:103)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.ReplicationWork.chooseTargets(ReplicationWork.java:51)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReconstructionWorkForBlocks(BlockManager.java:1902)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeBlockReconstructionWork(BlockManager.java:1854)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:4842)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$RedundancyMonitor.run(BlockManager.java:4709)
> at java.lang.Thread.run(Thread.java:748)
> 2019-06-19 05:54:07,296 INFO org.apache.hadoop.util.ExitUtil: Exiting with
> status 1: java.lang.IllegalArgumentException: 247 should >= 248, and both
> should be positive.
> 2019-06-19 05:54:07,298 INFO
> org.apache.hadoop.hdfs.server.common.HadoopAuditLogger.audit:
> process=Namenode operation=shutdown result=invoked
> 2019-06-19 05:54:07,298 INFO org.apache.hadoop.hdfs.server.namenode.NameNode:
> SHUTDOWN_MSG:
> /************************************************************
> SHUTDOWN_MSG: Shutting down NameNode at namenode/255.255.182.104
> ************************************************************/
> {noformat}
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