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https://issues.apache.org/jira/browse/HADOOP-1497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12505420
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Raghu Angadi commented on HADOOP-1497:
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> This case is possibly detected by the Client (using CRC).
Actually with Block-Level CRCs this may not be detected at the client either .
Since crc is per block, a client will silently get wrong data.
> Possibility of duplicate blockids if dead-datanodes come back up after
> corresponding files were deleted
> -------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1497
> URL: https://issues.apache.org/jira/browse/HADOOP-1497
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> Suppose a datanode D has a block B that belongs to file F. Suppose the
> datanode D dies and the namenode replicates those blocks to other datanodes.
> No, suppose the user deletes file F. The namenode removes all the blocks that
> belonged to file F. Now, suppose a new file F1 is created and the namenode
> generates the same blockid B for this new file F1.
> Suppose the old datanode D comes back to life. Now we have a valid corrupted
> block B on datanode D.
> This case is possibly detected by the Client (using CRC). But does HDFS need
> to handle this scenario better?
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