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https://issues.apache.org/jira/browse/HDFS-12518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-12518:
-----------------------------
    Attachment: HDFS-12518.01.patch

Patch 1:
- Added the fix in {{ReencryptionUpdater}} to handle canceled future better
- Modified the way {{submissions}} in {{ReencryptionHandler}} is managed: on 
-cancel and valid new -start, the zone submission tracker is reset. This means 
even if somehow an re-encryption is ended up in an erroneous state, it can 
still be reset from crypto CLI.
- Fixed / improved a few related places: protect {{submissions}} with the 
handler's object lock, logging fix, missed assert.
- Enhanced {{TestReencryption}} to ensure fault injector behave correctly when 
multi-threaded (had a 1% failure rate on dist-test

> Re-encryption should handle task cancellation and progress better
> -----------------------------------------------------------------
>
>                 Key: HDFS-12518
>                 URL: https://issues.apache.org/jira/browse/HDFS-12518
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: encryption
>    Affects Versions: 3.0.0-beta1
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HDFS-12518.01.patch
>
>
> Re-encryption should handle task cancellation and progress tracking better in 
> general.
> In a recent internal report, a canceled re-encryption could lead to the 
> progress of the zone being 'Processing' forever. Sending a new cancel command 
> would make it complete, but new re-encryptions for the same zone wouldn't 
> work because the canceled future is not removed.
> This jira proposes to fix that, and enhance the currently handling so new 
> command would start from a clean state.



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