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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11203) Rename support during re-encrypt EDEK
Date Fri, 28 Jul 2017 03:51:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16104409#comment-16104409

Xiao Chen commented on HDFS-11203:

Hi [~daryn],

I discussed with [~andrew.wang] today, and our speculation is you're proposing only about
re-resolution, not how we iterate the EZ. I have edited the description of this jira to state
the problem clearer. Could you check and see if we're on the same page?


> Rename support during re-encrypt EDEK
> -------------------------------------
>                 Key: HDFS-11203
>                 URL: https://issues.apache.org/jira/browse/HDFS-11203
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: encryption
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
> Currently HDFS-10899 disables renames within the EZ if it's under re-encryption. (similar
to current cross-zone rename checks).
> We'd like to support rename in the long run, so cluster is fully functioning during re-encryption.
> The reason rename is particularly difficult is:
> - We want to re-encrypt all files under an EZ in one pass, without missing any
> - We want to iterate through the files and keep track of where we are (i.e. a cursor),
so in case of NN failover/crash, we can resume from fsimage/edits.
> - We cannot guarantee namespace is not changed during re-encryption. Newly created files
automatically has new edek, deleted files we don't care. But if a file is renamed from behind
the cursor to before, it may be missed in the re-encryption.

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