HBASE-27339 Improve sasl connection failure log message to include server (#4823)

Include the remote server name in the logged exception message when the
connection setup fails in BlockingRpcConnection.

Add an equivalent log line in NettyRpcConnection.

Signed-off-by: Viraj Jasani <vjasani@apache.org>

Conflicts:
	hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcConnection.java

Author: apurtell

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/BlockingRpcConnection.java

@@ -395,7 +395,8 @@ public Object run() throws IOException, InterruptedException {
         // A provider which failed authentication, but doesn't have the ability to relogin with
         // some external system (e.g. username/password, the password either works or it doesn't)
         if (!provider.canRetry()) {
-          LOG.warn("Exception encountered while connecting to the server : " + ex);
+          LOG.warn("Exception encountered while connecting to the server " + remoteId.getAddress(),
+            ex);
           if (ex instanceof RemoteException) {
             throw (RemoteException) ex;
           }
@@ -410,7 +411,8 @@ public Object run() throws IOException, InterruptedException {
         // Other providers, like kerberos, could request a new ticket from a keytab. Let
         // them try again.
         if (currRetries < maxRetries) {
-          LOG.debug("Exception encountered while connecting to the server", ex);
+          LOG.debug("Exception encountered while connecting to the server " + remoteId.getAddress(),
+            ex);
 
           // Invoke the provider to perform the relogin
           provider.relogin();

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcConnection.java

@@ -296,7 +296,10 @@ protected void initChannel(Channel ch) throws Exception {
         public void operationComplete(ChannelFuture future) throws Exception {
           Channel ch = future.channel();
           if (!future.isSuccess()) {
-            failInit(ch, toIOE(future.cause()));
+            IOException ex = toIOE(future.cause());
+            LOG.warn(
+              "Exception encountered while connecting to the server " + remoteId.getAddress(), ex);
+            failInit(ch, ex);
             rpcClient.failedServers.addToFailedServers(remoteId.getAddress(), future.cause());
             return;
           }