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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11096) Support rolling upgrade between 2.x and 3.x
Date Fri, 29 Sep 2017 18:31:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16186201#comment-16186201
] 

Aaron T. Myers commented on HDFS-11096:
---------------------------------------

bq. Currently YARN rolling upgrades are actually failing because the Hadoop 3 ResourceManager
is using URIs like http://ns1:8020/... (logical namespace name used as though it's a hostname).
Not sure where that's coming from yet, I need to dig there, but I doubt the fix there will
invalidate much review of the current code.

I investigated this the other day and came to the conclusion that this is due to a bug introduced
by YARN-6457. See [this comment|https://issues.apache.org/jira/browse/YARN-6457?focusedCommentId=16184700&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16184700]
in particular for a description of the issue.

> Support rolling upgrade between 2.x and 3.x
> -------------------------------------------
>
>                 Key: HDFS-11096
>                 URL: https://issues.apache.org/jira/browse/HDFS-11096
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: rolling upgrades
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Sean Mackrory
>            Priority: Blocker
>         Attachments: HDFS-11096.001.patch, HDFS-11096.002.patch, HDFS-11096.003.patch,
HDFS-11096.004.patch
>
>
> trunk has a minimum software version of 3.0.0-alpha1. This means we can't rolling upgrade
between branch-2 and trunk.
> This is a showstopper for large deployments. Unless there are very compelling reasons
to break compatibility, let's restore the ability to rolling upgrade to 3.x releases.



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