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https://issues.apache.org/jira/browse/HDFS-10899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-10899:
-----------------------------
    Attachment: Re-encrypt edek design doc V2.pdf
                HDFS-10899.10.wip.patch

Reviving this after a quite period.... Updated v2 design doc and a WIP patch 
v10.
Most notable changes are:
- Reuse the existing EZ xattr for re-encryption logging - by adding an optional 
field to protobuf
- Added multi-threading to contact the KMS to re-encrypt edeks.

Design doc:
- Briefed up a little, to keep the doc short
- added multi-threading section
- updated metadata persistent section

wip patch demonstrates the idea. Still have a bunch of todos:
- Previous todos
- Address Andrew's comments above
- Review fsn/fsd locking, and check synchronization of multi-threads
- Throttler need to consider memory consumption

> Add functionality to re-encrypt EDEKs
> -------------------------------------
>
>                 Key: HDFS-10899
>                 URL: https://issues.apache.org/jira/browse/HDFS-10899
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: encryption, kms
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: editsStored, HDFS-10899.01.patch, HDFS-10899.02.patch, 
> HDFS-10899.03.patch, HDFS-10899.04.patch, HDFS-10899.05.patch, 
> HDFS-10899.06.patch, HDFS-10899.07.patch, HDFS-10899.08.patch, 
> HDFS-10899.09.patch, HDFS-10899.10.wip.patch, HDFS-10899.wip.2.patch, 
> HDFS-10899.wip.patch, Re-encrypt edek design doc.pdf, Re-encrypt edek design 
> doc V2.pdf
>
>
> Currently when an encryption zone (EZ) key is rotated, it only takes effect 
> on new EDEKs. We should provide a way to re-encrypt EDEKs after the EZ key 
> rotation, for improved security.



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