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https://issues.apache.org/jira/browse/HDFS-5475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arpit Agarwal updated HDFS-5475:
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Attachment: h5475.01.patch
Patch to update target storage in {{BlockInfo}} and
{{BlockInfoUnderConstruction}} from block reports. This fixes {{TestGetBlocks}}.
> NN incorrectly tracks more than one replica per DN
> --------------------------------------------------
>
> Key: HDFS-5475
> URL: https://issues.apache.org/jira/browse/HDFS-5475
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: Heterogeneous Storage (HDFS-2832)
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments: h5475.01.patch
>
>
> NN chooses a provisional target storage when allocating a new block and
> records that block in the blockList of that storage. However the datanode is
> free to choose a different storage for the block. On the next block report
> the NN ends up with two blockList entries for the same replica+DN combination.
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