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https://issues.apache.org/jira/browse/HDDS-15350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDDS-15350:
-----------------------------------
Summary: Divide by zero bug crashed SCM when decommissioning a datanode
(was: Divide by zero bug crash SCM when decommission datanode)
> Divide by zero bug crashed SCM when decommissioning a datanode
> --------------------------------------------------------------
>
> Key: HDDS-15350
> URL: https://issues.apache.org/jira/browse/HDDS-15350
> Project: Apache Ozone
> Issue Type: Bug
> Components: SCM
> Reporter: Wei-Chiu Chuang
> Priority: Major
>
> Encountered an interesting bug:
>
> {noformat}
> 2026-05-22 16:23:39,439 ERROR
> [ReplicationMonitor]-org.apache.hadoop.hdds.scm.container.replication.ReplicationManager:
> Exception in Replication Monitor Thr
> ead.
> java.lang.ArithmeticException: / by zero
> at
> org.apache.hadoop.hdds.scm.SCMCommonPlacementPolicy.getMaxReplicasPerRack(SCMCommonPlacementPolicy.java:419)
> at
> org.apache.hadoop.hdds.scm.SCMCommonPlacementPolicy.validateContainerPlacement(SCMCommonPlacementPolicy.java:466)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.ECMisReplicationCheckHandler.getPlacementStatus(ECMisReplicationCheckHandler.java:138)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.ECMisReplicationCheckHandler.checkMisReplication(ECMisReplicationCheckHandler.java:93)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.ECMisReplicationCheckHandler.handle(ECMisReplicationCheckHandler.java:69)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:38)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.health.AbstractCheck.handleChain(AbstractCheck.java:40)
> at
> org.apache.hadoop.hdds.scm.container.replication.ReplicationManager.processContainer(ReplicationManager.java:899)
> at
> org.apache.hadoop.hdds.scm.container.replication.ReplicationManager.processContainer(ReplicationManager.java:872)
> at
> org.apache.hadoop.hdds.scm.container.replication.ReplicationManager.processAll(ReplicationManager.java:399)
> at
> org.apache.hadoop.hdds.scm.container.replication.ReplicationManager.run(ReplicationManager.java:953)
> at java.lang.Thread.run(Thread.java:748)
> 2026-05-22 16:23:39,442 INFO
> [ReplicationMonitor]-org.apache.hadoop.util.ExitUtil: Exiting with status 1:
> java.lang.ArithmeticException: / by zero {noformat}
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