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From Steve Loughran <ste...@hortonworks.com>
Subject Re: Set minimum version of Hadoop 3 to JDK 8
Date Wed, 22 Apr 2015 10:13:21 GMT

> On 21 Apr 2015, at 23:31, Andrew Wang <andrew.wang@cloudera.com> wrote:
> 
> Hey Robert,
> 
> As a first step, could we try switching all our precommit and nightly
> builds over to use 1.8? This is a prerequisite for HADOOP-11858, and safe
> to do in any case since it'll still target 1.7.

+1

we have jenkin builds running on Java 8 -its just they have enough longstanding and intermittent
test failures that they get ignored

I've been trying to keep hadoop-common somewhat under control, but 

-YARN is failing due to to hard coded ports in tests - this needs to be fixed urgently: YARN-3528

-HDFS build process itself is failing with some config problem checkstyle


> 
> I'll note that HADOOP-10530 details the pain Steve went through switching
> us to JDK7. Might be some lessons learned about how to do this transition
> more smoothly.
> 


The key thing is to have Jenkins happy before trying to change anything. And make sure that
"happy" means that jenkins really is building and testing against the version of Java that
you think it is. I spent about 15 minutes/hour of my weekend kicking off builds and tuning
them.  -I volunteered Colin Patrick McCabe to to that bit of the switch, though of course
he doesn't have to accept that opportunuty ( https://issues.apache.org/jira/browse/HADOOP-10530?focusedCommentId=14239250&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14239250


Someone needs to take ownership of the "Jenkins builds are broken" problem -ideally someone
in each subproject. That's a prerequisite to any major changes in the build process, but should
also be best practice anyway. Ask your QE teams "would you like the ASF projects to care whether
their jenkins test runs succeed" and see what they say.

as a reminder, all the jenkins builds are here
https://builds.apache.org/view/H-L/view/Hadoop/

please look at them and try to fix them —without even waiting for a switch to Java 8
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