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https://issues.apache.org/jira/browse/HDDS-1899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16924282#comment-16924282
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Lokesh Jain commented on HDDS-1899:
-----------------------------------
[~nandakumar131] I think the exception seems harmless. This exception is thrown
when the container can not be found before processing a DeleteBlocks command.
As mentioned by you it can be because replication manager deleted a container
before block deletion was processed.
There is another issue however. Currently all the synchronization is done via
locking the container object itself. In case of delete container the container
is removed from containerSet but the container object may still be alive and
can be used to acquire a lock on the container. Also in deleteContainer we
delete the container outside the lock which could race with the other
operations.
With the current locking semantics we need to check if container exists or not
after acquiring a lock on it. Also container deletion should be done inside the
lock itself.
> DeleteBlocksCommandHandler is unable to find the container in SCM
> -----------------------------------------------------------------
>
> Key: HDDS-1899
> URL: https://issues.apache.org/jira/browse/HDDS-1899
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: SCM
> Affects Versions: 0.4.0
> Reporter: Mukul Kumar Singh
> Priority: Major
> Labels: MiniOzoneChaosCluster
>
> DeleteBlocksCommandHandler is unable to find a container in SCM.
> {code}
> 2019-08-02 14:04:56,735 WARN commandhandler.DeleteBlocksCommandHandler
> (DeleteBlocksCommandHandler.java:lambda$handle$0(140)) - Failed to delete
> blocks for container=33, TXID=184
> org.apache.hadoop.hdds.scm.container.common.helpers.StorageContainerException:
> Unable to find the container 33
> at
> org.apache.hadoop.ozone.container.common.statemachine.commandhandler.DeleteBlocksCommandHandler.lambda$handle$0(DeleteBlocksCommandHandler.java:122)
> at java.util.ArrayList.forEach(ArrayList.java:1257)
> at
> java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1080)
> at
> org.apache.hadoop.ozone.container.common.statemachine.commandhandler.DeleteBlocksCommandHandler.handle(DeleteBlocksCommandHandler.java:114)
> at
> org.apache.hadoop.ozone.container.common.statemachine.commandhandler.CommandDispatcher.handle(CommandDispatcher.java:93)
> at
> org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine.lambda$initCommandHandlerThread$1(DatanodeStateMachine.java:432)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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