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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14521) KMS client needs retry logic
Date Mon, 25 Sep 2017 18:42:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179539#comment-16179539
] 

Xiao Chen commented on HADOOP-14521:
------------------------------------

Hi [~shahrs87],

I understand this was missed in my initial reviews when it got committed. My apologies for
overlooking it, and any frustration it might have brought when reverting this.

But we should really fix the incompatible behavior I mentioned above, which patch 11 would
address. Could you take a look?

> KMS client needs retry logic
> ----------------------------
>
>                 Key: HADOOP-14521
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14521
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Rushabh S Shah
>            Assignee: Rushabh S Shah
>         Attachments: HADOOP-14521.09.patch, HADOOP-14521.11.patch, HADOOP-14521-branch-2.8.002.patch,
HADOOP-14521-branch-2.8.2.patch, HADOOP-14521-trunk-10.patch, HDFS-11804-branch-2.8.patch,
HDFS-11804-trunk-1.patch, HDFS-11804-trunk-2.patch, HDFS-11804-trunk-3.patch, HDFS-11804-trunk-4.patch,
HDFS-11804-trunk-5.patch, HDFS-11804-trunk-6.patch, HDFS-11804-trunk-7.patch, HDFS-11804-trunk-8.patch,
HDFS-11804-trunk.patch
>
>
> The kms client appears to have no retry logic – at all.  It's completely decoupled
from the ipc retry logic.  This has major impacts if the KMS is unreachable for any reason,
including but not limited to network connection issues, timeouts, the +restart during an upgrade+.
> This has some major ramifications:
> # Jobs may fail to submit, although oozie resubmit logic should mask it
> # Non-oozie launchers may experience higher rates if they do not already have retry logic.
> # Tasks reading EZ files will fail, probably be masked by framework reattempts
> # EZ file creation fails after creating a 0-length file – client receives EDEK in
the create response, then fails when decrypting the EDEK
> # Bulk hadoop fs copies, and maybe distcp, will prematurely fail



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