mozilla/public-suffix-list.txt and testing of hadoop-cos

[Steve Loughran <st...@cloudera.com.INVALID>]

Here;s a new little classpath issue for people:
https://issues.apache.org/jira/browse/HADOOP-18159

All copies of httpclient, including shaded ones in libraries used by the
s3a, gs and cos cloud connectors, turn out to load their TLD list from the
same resource mozilla/public-suffix-list.txt

If the version that is loaded is sufficiently out of date, is TLS
connections to object store endpoints may fail.

We are lucky that André Fonseca put in the efforts to track this down... We
had some internal suspicion that removing the hadoop-cos dependency made
this problem "Go away" but couldn't understand why given that both
libraries were shaded. Now we know.

Who is set up to test the hadoop-cos cloud connector? Because I've just
changed its dependencies without doing the strict regression testing. And,
as I am yet to kick off that 3.3.4 build but I want to get this change into
it.

Can anyone help with testing here?

Finally, and this is for future work. What do we do to stop this problem
coming back? As it will, won't it?