Now that hadoop 3.3.5 is out, i want to propose something new we switch branch-3.3 and trunk to being java11 only
1. java 11 has been out for years 2. oracle java 8 is no longer available under "premier support"; you can't really get upgrades https://www.oracle.com/java/technologies/java-se-support-roadmap.html 3. openJDK 8 releases != oracle ones, and things you compile with them don't always link to oracle java 8 (some classes in java.nio have added more overrides) 4. more and more libraries we want to upgrade to/bundle are java 11 only 5. moving to java 11 would cut our yetus build workload in half, and line up for adding java 17 builds instead. I know there are some outstanding issues still in https://issues.apache.org/jira/browse/HADOOP-16795 -but are they blockers? Could we just move to java11 and enhance at our leisure, once java8 is no longer a concern.
