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It's already split between Java8 laggards and Java11. Spark for example hasn't been able to upgrade to Java9 due to their use of some Unsafe stuff. Hadoop just

It's already split between Java8 laggards and Java11. Spark for example hasn't been able to upgrade to Java9 due to their use of some Unsafe stuff. Hadoop just upgraded from 7 to 8 last year.

pron 8y ago
Unsafe is still accessible even in JDK 11. May require some command-line flags, though.
- thayne 8y ago
  Java9+ broke some undocumented functionality that Spark, Hadoop, etc. may have been using.