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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14688) Intern strings in KeyVersion and EncryptedKeyVersion
Date Fri, 01 Sep 2017 06:07:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16150085#comment-16150085
] 

Wei-Chiu Chuang commented on HADOOP-14688:
------------------------------------------

Thanks [~misha@cloudera.com] for your insightful comment, and thanks [~xiaochen] for the performance
test.

I think the performance optimization makes sense to you especially in the context of key-rotation.
Hi [~daryn], how do you think? I would like to cast my +1 if there are no objections.

> Intern strings in KeyVersion and EncryptedKeyVersion
> ----------------------------------------------------
>
>                 Key: HADOOP-14688
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14688
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: kms
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: GC root of the String.png, HADOOP-14688.01.patch, heapdump analysis.png,
jxray.report
>
>
> This is inspired by [~misha@cloudera.com]'s work on HDFS-11383.
> The key names and key version names are usually the same for a bunch of {{KeyVersion}}
and {{EncryptedKeyVersion}}. We should not create duplicate objects for them.
> This is more important to HDFS-10899, where we try to re-encrypt all files' EDEKs in
a given EZ. Those EDEKs all has the same key name, and mostly using no more than a couple
of key version names.



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