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https://issues.apache.org/jira/browse/HDFS-4746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13859165#comment-13859165
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Konstantin Shvachko commented on HDFS-4746:
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Thanks for the observation, Plamen.
Keep the jira open, as branch 2.2 and 2.0 still have it.

> ClassCastException in BlockManager.addStoredBlock() due to that blockReceived 
> came after file was closed.
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4746
>                 URL: https://issues.apache.org/jira/browse/HDFS-4746
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.3-alpha
>            Reporter: Konstantin Shvachko
>
> In some cases the last block replica of a file can be reported after the file 
> was closed. In this case file inode is of type INodeFile. 
> BlockManager.addStoredBlock() though expects it to be 
> INodeFileUnderConstruction, and therefore class cast to 
> MutableBlockCollection fails.



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