Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/1338#discussion_r45088017
--- Diff:
flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/PipelineErrorHandler.java
---
@@ -0,0 +1,79 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.webmonitor;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.handler.codec.http.DefaultFullHttpResponse;
+import io.netty.handler.codec.http.HttpHeaders;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.HttpVersion;
+import org.apache.flink.runtime.webmonitor.handlers.JsonFactory;
+
+import java.io.IOException;
+import java.io.StringWriter;
+
+/**
+ * This is the last handler in the pipeline and logs all error messages.
+ */
+@ChannelHandler.Sharable
+public class PipelineErrorHandler extends
SimpleChannelInboundHandler<Object> {
+
+ @Override
+ protected void channelRead0(ChannelHandlerContext ctx, Object message) {
+ // we can't deal with this message. No one in the pipeline
handled it. Log it.
+ System.err.println("Unknown message received: " + message);
--- End diff --
Why are we not using our regular logging here?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
