azagrebin commented on a change in pull request #8445: 
[FLINK-12127][network,config] Move network related options form 
TaskManagerOptions and NettyConfig into NetworkEnvironmentOptions
URL: https://github.com/apache/flink/pull/8445#discussion_r285104973
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyConfig.java
 ##########
 @@ -38,53 +36,6 @@
 
        private static final Logger LOG = 
LoggerFactory.getLogger(NettyConfig.class);
 
-       // - Config keys 
----------------------------------------------------------
-
-       public static final ConfigOption<Integer> NUM_ARENAS = ConfigOptions
 
 Review comment:
   `NetworkEnvironment` relies on `NetworkEnvironmentConfiguration` which is 
basically a Java parsed version of `NetworkEnvironmentOptions`. `NettyConfig` 
is part of `NetworkEnvironmentConfiguration`, also parsed and intended for 
`NetworkEnvironment`. It is all about netty used for shuffling. We also 
consider netty shuffle implementation to be the default one as it is basically 
now. I am not sure about splitting its config.  Other shuffle services might 
reuse these options, might not. Their additional options will be separate 
anyways, either own class or even outside of Flink.

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