> On Jul 22, 2016, at 9:07 AM, Zhe Zhang <zhe.zhang.resea...@gmail.com> wrote:
> 
> Thanks Allen for the note. I thought the 2.6 Dockerfile issue was addressed 
> in https://issues.apache.org/jira/browse/HADOOP-12800?

2.6 builds on JDK6 and JDK7.  2.x, where x>6, builds on JDK7 and JDK8.  [1] 
This should have been a big red flag in that patch:

---
+RUN apt-get install -y oracle-java8-installer
---

(It's interesting that ~2 years later, we're still dealing with the fallout of 
the JRE compatibility break in 2.7.  I wonder how many of those PMCs who voted 
for it are still actively involved.)

[1] For completeness, 3.x only builds on JDK8 but probably not JDK9, given 
log4j 1.x, etc, etc.  
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