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https://issues.apache.org/jira/browse/HDFS-17467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17837114#comment-17837114
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farmmamba commented on HDFS-17467:
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[~hexiaoqiao] [~zhangshuyan] [~ayushsaxena] [~tomscut] Sir, could you please
check this problem when you are free ? Thanks a lot.
> IncrementalBlockReportManager#getPerStorageIBR may throw NPE when remove
> volumes
> --------------------------------------------------------------------------------
>
> Key: HDFS-17467
> URL: https://issues.apache.org/jira/browse/HDFS-17467
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 3.4.0
> Reporter: farmmamba
> Assignee: farmmamba
> Priority: Major
>
> When we remove volumes, it may cause
> IncrementalBlockReportManager#getPerStorageIBR throws NPE.
> Consider below situation:
> 1、we have down createRbw、finalizeBlock. But have not done
> datanode.closeBlock in method `BlockReceiver.PacketResponder#finalizeBlock`.
> 2、we remove volume which replica was written to and it executes such code:
> `storageMap.remove(storageUuid);`
> 3、 we begin to execute datanode.closeBlock which try to send IBR to NameNode.
> but when getting DatanodeStorage from storageMap using
> storageUuid, we will get null because we have remove this storageUuid key
> from storageMap.
> 4、Throw NPE in getPerStorageIBR method, because ConcurrentHashMap don't allow
> null key.
>
>
>
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