Java performance and stability issues with huge heap (terabyte+) upgrading from JDK11

Solution Verified - Updated -

Issue

  • Upgrading java application with 1+ terabyte java heap from Java 11 to Java 17 or Java 21 per-release results in performance and stability (crashes) issues.
  • Testing JDK17/21 + G1 and JDK17 + ZGC has been unacceptable due to instability (many crashes).

Environment

  • OpenJDK
    • 11
    • 17

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