Github user roshannaik commented on a diff in the pull request:
https://github.com/apache/storm/pull/2502#discussion_r168026607
--- Diff:
storm-client/src/jvm/org/apache/storm/messaging/netty/BackPressureStatus.java
---
@@ -0,0 +1,75 @@
+/*
+ * 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.storm.messaging.netty;
+
+import org.apache.storm.serialization.KryoValuesDeserializer;
+import org.apache.storm.serialization.KryoValuesSerializer;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.concurrent.atomic.AtomicLong;
+
+// Instances of this type are sent from NettyWorker to upstream
WorkerTransfer to indicate BackPressure situation
+public class BackPressureStatus {
+ public static final short IDENTIFIER = (short)-600;
+ private static final int SIZE_OF_ID = 2; // size if IDENTIFIER
+ private static final int SIZE_OF_INT = 4;
+
+ private static AtomicLong bpCount = new AtomicLong(0);
+
+ public String workerId;
+ public final long id; // monotonically
increasing id
--- End diff --
Its only for debugging purposes.. so that we can co-relate sent & recvd
msgs. I have used it to measure latency involved in transmission of
BackPressureStatus msgs.
---
