From 1084c7b6b20f51bd0d4ad66ddcc873ba4a813697 Mon Sep 17 00:00:00 2001
From: Jason Tedor <jason@tedor.me>
Date: Sun, 1 Oct 2017 09:41:13 -0400
Subject: [PATCH] Log cause when a write and flush fails

This commit logs the cause of a write and flush operation on the network
layer that failed.
---
 .../java/org/elasticsearch/transport/netty4/Netty4Transport.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/transport-netty4/src/main/java/org/elasticsearch/transport/netty4/Netty4Transport.java b/modules/transport-netty4/src/main/java/org/elasticsearch/transport/netty4/Netty4Transport.java
index 9cc75a08ee2..f85330ef759 100644
--- a/modules/transport-netty4/src/main/java/org/elasticsearch/transport/netty4/Netty4Transport.java
+++ b/modules/transport-netty4/src/main/java/org/elasticsearch/transport/netty4/Netty4Transport.java
@@ -321,6 +321,7 @@ public class Netty4Transport extends TcpTransport<Channel> {
                 listener.onResponse(channel);
             } else {
                 final Throwable cause = f.cause();
+                logger.error("write and flush on the network layer failed", cause);
                 Netty4Utils.maybeDie(cause);
                 assert cause instanceof Exception;
                 listener.onFailure((Exception) cause);