Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/6355#discussion_r203657904
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyClient.java
---
@@ -52,6 +55,7 @@
private Bootstrap bootstrap;
+ private SSLUtils.SSLClientConfiguration clientSSLConfig;
--- End diff --
add `@Nullable`---
