Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/16706#discussion_r98072101
--- Diff: core/src/main/scala/org/apache/spark/rpc/RpcEndpointAddress.scala
---
@@ -25,10 +27,11 @@ import org.apache.spark.SparkException
* The `rpcAddress` may be null, in which case the endpoint is registered
via a client-only
* connection and can only be reached via the client that sent the
endpoint reference.
*
- * @param rpcAddress The socket address of the endpoint.
+ * @param rpcAddress The socket address of the endpoint. It's `null` when
this address pointing to
+ * an endpoint in a client `NettyRpcEnv`.
* @param name Name of the endpoint.
*/
-private[spark] case class RpcEndpointAddress(val rpcAddress: RpcAddress,
val name: String) {
+private[spark] case class RpcEndpointAddress(@Nullable rpcAddress:
RpcAddress, name: String) {
--- End diff --
+1 we could add a comment there instead of pulling in a new annotation
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