Github user NicoK commented on a diff in the pull request: https://github.com/apache/flink/pull/4112#discussion_r126451783 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyBufferPool.java --- @@ -61,7 +60,9 @@ public NettyBufferPool(int numberOfArenas) { checkArgument(numberOfArenas >= 1, "Number of arenas"); this.numberOfArenas = numberOfArenas; - if (!PlatformDependent.hasUnsafe()) { + try { + Class.forName("sun.misc.Unsafe"); + } catch (ClassNotFoundException e) { --- End diff -- After checking with @StefanRRichter, it seems this check is unnecessary anyway since `org.apache.flink.core.memory.MemoryUtils#UNSAFE` is getting the class if needed and if not existing, Flink should not start anyway.
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