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From Allen Wittenauer ...@effectivemachines.com>
Subject Re: Trunk fails
Date Sun, 23 Jul 2017 14:33:54 GMT

> On Jul 22, 2017, at 11:31 PM, Brahma Reddy Battula <brahmareddy.battula@hotmail.com>
> AFAIK, Patch install(i mean,mvn install) will not run all the projects hence you didn't
seen this failure.

Correct. By design, precommit only runs the test suite against the maven modules that the
patch modifies to save (significant!) processing time. The number of patches that would benefit
from touching the entire source base is relatively small. But they do exist which is why the
two follow up jobs are important:

	* the hadoop-trunk-commit, which writes the maven repo status at the end of every JIRA. It
builds (almost) everything but skips unit tests. It runs every 20 minutes and only if there
has been a commit.

	* the daily qbt report which builds and runs EVERYTHING: all the modules, all the native
code supported by the docker-ized env, all the unit tests. (For those curious, it currently
clocks in at around 9.5 hours. That's up by about 1.5 hours since I added it over a year ago.)

In this case, both of these failed and should have been an indication that something was very,
very wrong. Committers should be making it a priority to watch for both of those reports to
confirm that their commit didn't break anything.

(I'm not sure if we have or ever had any documentation on what happens after a commit. While
these jobs have been rewritten, the process of patch verification process from a committer
view hasn't changed in probably five years or more.   The tribal knowledge is failing to get
passed down from one generation to another.)
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