Fixed - PingConnectionHandler throws CancellationException. #3072

redisson/src/main/java/org/redisson/client/handler/PingConnectionHandler.java

@@ -78,7 +78,7 @@ public class PingConnectionHandler extends ChannelInboundHandlerAdapter {
                 if (future != null
                         && (future.cancel(false) || !future.isSuccess())) {
                     ctx.channel().close();
-                    if (future.cause() != null) {
+                    if (future.cause() != null && !future.isCancelled()) {
                         log.error("Unable to send PING command over channel: " + ctx.channel(), future.cause());
                     }
                     log.debug("channel: {} closed due to PING response timeout set in {} ms", ctx.channel(), config.getPingConnectionInterval());