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https://issues.apache.org/jira/browse/HDFS-5907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-5907 started by Arpit Agarwal.
> Handle block deletion requests during rolling upgrades
> ------------------------------------------------------
>
> Key: HDFS-5907
> URL: https://issues.apache.org/jira/browse/HDFS-5907
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: HDFS-5535 (Rolling upgrades)
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
>
> Jira to track the following:
> # During a rolling upgrade the DataNode should handle block deletions by
> creating hard links to the block files.
> # Files must be restored during a rollback.
> # Cleanup hard links during finalize.
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