During the Wednesday's meetup, we discussed the plan for the "bridge release" branch-2.10.
A smooth upgrade path (that is, rolling upgrade) from 2.10 to Hadoop 3 was called out as the most critical release criteria. I am wondering if Tomcat (as well as other dependency upgrade) upgrade should be considered as well? We migrated from Tomcat to Jetty in Hadoop3, because Tomcat 6 went EOL in 2016. But we did not realize three years after Tomcat 6's EOL, a majority of Hadoop users are still in Hadoop 2, and it looks like Hadoop 2 will stay alive for another few years. Backporting Jetty to Hadoop2 is probably too big of an imcompatibility. How about migrating to Tomcat9? FWIW, Tomcat 6 EOL along is big enough a reason why you should move up to Hadoop 3. :)
