lhotari opened a new pull request #11138:
URL: https://github.com/apache/pulsar/pull/11138


   ### Motivation
   
   - enables Netty to use more efficient UnpooledUnsafeNoCleanerDirectByteBuf 
in JDK9+ (JDK 11 in this case). This is already used in JDK8. In JDK9+, it is 
necessary to set `-Dio.netty.tryReflectionSetAccessible=true` to prevent 
regressions in this area.
   - fixes `jvm_memory_direct_bytes_used metric` for Bookkeeper (Bookie) 
   
   ### Modifications
   
   - pass `-Dio.netty.tryReflectionSetAccessible=true` JVM option by default to 
all pulsar process started with `bin/pulsar` script.


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