Github user harshach commented on a diff in the pull request:
https://github.com/apache/storm/pull/1687#discussion_r83285410
--- Diff:
examples/storm-starter/src/jvm/org/apache/storm/starter/trident/DebugMemoryMapState.java
---
@@ -0,0 +1,73 @@
+/*
+ * 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.starter.trident;
+
+import org.apache.storm.task.IMetricsContext;
+import org.apache.storm.topology.FailedException;
+import org.apache.storm.trident.state.CombinerValueUpdater;
+import org.apache.storm.trident.state.State;
+import org.apache.storm.trident.state.StateFactory;
+import org.apache.storm.trident.state.ValueUpdater;
+import org.apache.storm.trident.testing.MemoryMapState;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+public class DebugMemoryMapState<T> extends MemoryMapState<T> {
+ private static final Logger LOG =
LoggerFactory.getLogger(DebugMemoryMapState.class);
+
+ private int updateCount = 0;
+
+ public DebugMemoryMapState(String id) {
+ super(id);
+ }
+
+ public List<T> multiUpdate(List<List<Object>> keys, List<ValueUpdater>
updaters) {
+ print(keys, updaters);
+ if ((updateCount++ % 5) == 0) {
+ LOG.error("Throwing FailedException");
+ throw new FailedException("Enforced State Update Fail. On
retrial should replay the exact same batch.");
+ }
+ return super.multiUpdate(keys, updaters);
+ }
+
+ private void print(List<List<Object>> keys, List<ValueUpdater>
updaters) {
+ for (int i = 0; i < keys.size(); i++) {
+ ValueUpdater valueUpdater = updaters.get(i);
+ Object arg = ((CombinerValueUpdater) valueUpdater).getArg();
+ LOG.debug("updateCount = {}, keys = {} => updaterArgs = {}",
updateCount, keys.get(i), arg);
--- End diff --
should this just print with info level since this is a debugState why make
another hop to enable debug for this topology.
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