Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/4562#discussion_r134166175
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyMessage.java
---
@@ -220,6 +220,10 @@ void releaseBuffer() {
@Override
ByteBuf write(ByteBufAllocator allocator) throws IOException {
+ if (null == buffer) {
+ throw new NullPointerException();
--- End diff --
actually, better use `Preconditions#checkNotNull(T)` - an additional error
message there usually does not make too much sense as the failure is clear
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