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https://issues.apache.org/jira/browse/HDFS-5907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13898881#comment-13898881
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Suresh Srinivas commented on HDFS-5907:
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bq. The only addition is that DN rollback is triggered by passing a
-rollingUpgrade rollback flag at startup.
This is the description I was looking for.
> 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
> Attachments: HDFS-5907.01.patch, HDFS-5907.02.patch
>
>
> DN changes when a rolling upgrade is in progress:
> # DataNode should handle block deletions by moving block files to 'trash'.
> # Block files should be restored to their original locations during a
> rollback.
> # Purge trash when the rolling upgrade is finalized.
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