Hadoop now has a wiki page to show the EOL releases lines https://cwiki.apache.org/confluence/display/HADOOP/EOL+(End-of-life)+Release+Branches
2.8.x is finally dead, so we'd better at least upgrade to 2.9.x in newer release lines. And in this announcement https://lists.apache.org/thread.html/r348f7bc93a522f05b7cce78a911854d128a6b1b8bd8124bad4d06ce6%40%3Cuser.hadoop.apache.org%3E They even say you'd better upgrade to 2.10+. For me, I prefer we just bump the hadoop version of 2.3.0 directly to 2.10.0, as 2.9.x is almost dead too. And since we still support hadoop 2.9.x on 2.2.x release line, which is the current stable release line, which should be fine for users. And for master branch, I suggest we just drop all the support for hadoop 2.x and bump hadoop to 3.1.x directly. Thoughts? Thanks.
