HBASE-25933 Log trace raw exception, instead of cause message in Nett…

…yRpcServerRequestDecoder (#3323)

Signed-off-by: Rushabh Shah <shahrs87@gmail.com>
Signed-off-by: Peter Somogyi <psomogyi@apache.org>
Signed-off-by: Josh Elser <elserj@apache.org>

(Cherry picked from commit feb89d9)

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcServerRequestDecoder.java

@@ -74,7 +74,7 @@ public void channelInactive(ChannelHandlerContext ctx) throws Exception {
   public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) {
     allChannels.remove(ctx.channel());
     NettyRpcServer.LOG.trace("Connection {}; caught unexpected downstream exception.",
-        ctx.channel().remoteAddress(), e.getCause());
+        ctx.channel().remoteAddress(), e);
     ctx.channel().close();
   }
 }