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https://issues.apache.org/jira/browse/HDFS-10899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136469#comment-16136469
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Xiao Chen commented on HDFS-10899:
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bq. ReencryptionUpdater#throttle(): updater would keep contending for namenode
lock
{{batchService.take();}} is a blocking call, so hangs there if 'nothing to do',
so NN lock untouched.
1.0 means no throttling, so would be touch on locking - that's because this is
intended to be run in a maintenance window. Same reason why renames are
disabled during this time.
Throttler also considers how many tasks are pending, to prevent piling up tasks
on NN heap.
bq. ... ZoneSubmissionTracker#tasks.... If there will always be just one
ReencryptionHandler, then this is okay.
Good analysis. Yes, one handler.
bq. the edit log is written only when all tasks are successful.
That {{updateReencryptionProgress}} call is to update the zone node with the
progress. The actual file xattrs (aka. new edeks) are logged during the
processing of each batch, via {{FSDirEncryptionZoneOp.setFileEncryptionInfo}}
> 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.patch, HDFS-10899.10.wip.patch,
> HDFS-10899.11.patch, HDFS-10899.12.patch, HDFS-10899.13.patch,
> HDFS-10899.14.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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