Does Cassandra support Java 10?

Question

We\'re planning on migrating our environment from Java 8 to OpenJDK 10. Doing this on my local machine, I\'ve found that Cassandra will no longer start for me, giving the fo

Answer 1

With Cassandra 3.11.4 we have been able to execute the Cassandra engine with Java 11, but there has been some gotchas:

• If for any reason you are still using CMS for garbage collection, it would be the time to move to G1; this is set up in the jvm.options file.
• Also in jvm.options, you will need to disable the ThreadPriorityPolicy as it was deprecated with Java 9
• With the unified logging of gc activity, introduced with Java 9, you will need to remove gc specific parameters in jvm.options. Some of those parameters are:
  • -Xloggc
  • -XX:+PrintGCDetails
  • -XX:+PrintGCDateStamps
  • -XX:+PrintHeapAtGC
  • -XX:+PrintTenuringDistribution
  • -XX:+PrintGCApplicationStoppedTime
  • -XX:+PrintPromotionFailure

• nodetool still requires Java 8 to be able to execute.

  • We have both JVM installed, and used alternatives to set Java 11 as the default. This is also the value of the JAVA_HOME variable
  • We have a new variable called JAVA8_HOME that points to that version
  • We updated the nodetool script (in our case it was in /usr/bin/nodetool) to use JAVA8_HOME when setting the JAVA variable

• For a cluster that was using offheap_buffers for memtable_allocation_type (it is defined in cassandra.yaml), we had to change it to use offheap_objects