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https://issues.apache.org/jira/browse/HADOOP-8209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252230#comment-13252230
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Eli Collins commented on HADOOP-8209:
-------------------------------------
Ran all the tests. There are 5 MR failures on branch-1, confirmed they all fail
on a clean tree and filed MAPREDUCE-4142 for them.
> Add option to relax build-version check for branch-1
> ----------------------------------------------------
>
> Key: HADOOP-8209
> URL: https://issues.apache.org/jira/browse/HADOOP-8209
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 1.0.0
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: hadoop-8209.txt, hadoop-8209.txt
>
>
> In 1.x DNs currently refuse to connect to NNs if their build *revision* (ie
> svn revision) do not match. TTs refuse to connect to JTs if their build
> *version* (version, revision, user, and source checksum) do not match.
> This prevents rolling upgrades, which is intentional, see the discussion in
> HADOOP-5203. The primary motivation in that jira was (1) it's difficult to
> guarantee every build on a large cluster got deployed correctly, builds don't
> get rolled back to old versions by accident etc, and (2) mixed versions can
> lead to execution problems that are hard to debug.
> However there are also cases when users know they two builds are compatible,
> eg when deploying a new build which contains the same contents as the
> previous one, plus a critical security patch that does not affect
> compatibility. Currently deploying a 1 line patch requires taking down the
> entire cluster (or trying to work around the issue by lying about the build
> revision or checksum, yuck). These users would like to be able to perform a
> rolling upgrade.
> In order to support this, let's add an option that is off by default, but,
> when enabled, makes the DN and TT version check just check for an exact
> version match (eg "1.0.2") but ignore the build revision (DN) and the source
> checksum (TT). Two builds still need to match the major, minor, and point
> numbers, but nothing else.
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