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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14521) KMS client needs retry logic
Date Thu, 15 Jun 2017 21:04:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051066#comment-16051066
] 

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

I know this probably isn't anyone's favorite part (at least not mine), but we're supposed
to fix things caught by pre-commit.

Replacing
{code}
              CommonConfigurationKeysPublic.KMS_CLIENT_FAILOVER_MAX_RETRIES_KEY
              , getConf().getInt(
{code}
with
{code}
              CommonConfigurationKeysPublic.KMS_CLIENT_FAILOVER_MAX_RETRIES_KEY,
              getConf().getInt(CommonConfigurationKeysPublic.
{code}
Will fix that.

> 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: 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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