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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10899) Add functionality to re-encrypt EDEKs
Date Thu, 17 Aug 2017 07:21:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Chen updated HDFS-10899:
-----------------------------
    Attachment: HDFS-10899.14.patch

Thanks again [~daryn] for the guidelines about general benchmarking.

I have run some numbers, proving the throttler to work. Shared a result [doc|https://docs.google.com/document/d/18mP2hbBHSoVriBgtArQkOLSPdwpxo5lk3MQwYz0s7y8/edit#heading=h.xh5gibeh09wp].
Unfortunately for the time being I don't have a beefy enough machine to stress the NN to reach
the ops/sec you described, and only have a [gce|https://cloud.google.com/compute/pricing]
instance. Therefore as shown in the doc, the stress is bottlenecked on CPU, instead of the
read/write lock.

Some highlights from the doc which I think shows the throttling taking effect:
- Throttle ratio 0.1, without stress (only re-encryption), we see host CPU dropped to be steadily
< 50%.
- Without throttling, throughput during re-encryption is only ~ 65% of baseline.
- With throttle ratio 0.1, ~ 75%
- With an extreme throttle ratio of 0.001, ~90%

I'll look into why 0.001 doesn't provide a 99% throughput. But otherwise ready for review.
Patch 14 is attached, based on trunk on top of HADOOP-14705's latest patch.

> 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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