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/**
* 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.heron.examples.api;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import org.apache.heron.api.Config;
import org.apache.heron.api.HeronSubmitter;
import org.apache.heron.api.bolt.BaseRichBolt;
import org.apache.heron.api.bolt.OutputCollector;
import org.apache.heron.api.metric.GlobalMetrics;
import org.apache.heron.api.topology.IUpdatable;
import org.apache.heron.api.topology.OutputFieldsDeclarer;
import org.apache.heron.api.topology.TopologyBuilder;
import org.apache.heron.api.topology.TopologyContext;
import org.apache.heron.api.tuple.Tuple;
import org.apache.heron.api.utils.Utils;
import org.apache.heron.examples.api.spout.TestWordSpout;
import org.apache.heron.simulator.Simulator;
/**
* This is a basic example of a Storm topology.
*/
public final class ExclamationTopology {
private ExclamationTopology() {
}
public static void main(String[] args) throws Exception {
TopologyBuilder builder = new TopologyBuilder();
int parallelism = 2;
int spouts = parallelism;
builder.setSpout("word", new TestWordSpout(Duration.ofMillis(0)), spouts);
int bolts = 2 * parallelism;
builder.setBolt("exclaim1", new ExclamationBolt(), bolts)
.shuffleGrouping("word");
Config conf = new Config();
conf.setDebug(true);
conf.setMaxSpoutPending(10);
conf.setMessageTimeoutSecs(600);
conf.put(Config.TOPOLOGY_WORKER_CHILDOPTS, "-XX:+HeapDumpOnOutOfMemoryError");
// resources configuration
conf.setComponentRam("word", ExampleResources.getComponentRam());
conf.setComponentRam("exclaim1",
ExampleResources.getComponentRam());
conf.setContainerDiskRequested(
ExampleResources.getContainerDisk(spouts + bolts, parallelism));
conf.setContainerRamRequested(
ExampleResources.getContainerRam(spouts + bolts, parallelism));
conf.setContainerCpuRequested(
ExampleResources.getContainerCpu(spouts + bolts, parallelism));
if (args != null && args.length > 0) {
conf.setNumStmgrs(parallelism);
HeronSubmitter.submitTopology(args[0], conf, builder.createTopology());
} else {
System.out.println("Topology name not provided as an argument, running in simulator mode.");
Simulator simulator = new Simulator();
simulator.submitTopology("test", conf, builder.createTopology());
Utils.sleep(10000);
simulator.killTopology("test");
simulator.shutdown();
}
}
public static class ExclamationBolt extends BaseRichBolt implements IUpdatable {
private static final long serialVersionUID = 1184860508880121352L;
private long nItems;
private long startTime;
@Override
@SuppressWarnings("rawtypes")
public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
nItems = 0;
startTime = System.currentTimeMillis();
}
@Override
public void execute(Tuple tuple) {
if (++nItems % 100000 == 0) {
long latency = System.currentTimeMillis() - startTime;
System.out.println(tuple.getString(0) + "!!!");
System.out.println("Bolt processed " + nItems + " tuples in " + latency + " ms");
GlobalMetrics.incr("selected_items");
}
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
// declarer.declare(new Fields("word"));
}
/**
* Implementing this method is optional and only necessary if BOTH of the following are true:
*
* a.) you plan to dynamically scale your bolt/spout at runtime using 'heron update'.
* b.) you need to take action based on a runtime change to the component parallelism.
*
* Most bolts and spouts should be written to be unaffected by changes in their parallelism,
* but some must be aware of it. An example would be a spout that consumes a subset of queue
* partitions, which must be algorithmically divided amongst the total number of spouts.
* <P>
* Note that this method is from the IUpdatable Heron interface which does not exist in Storm.
* It is fine to implement IUpdatable along with other Storm interfaces, but implementing it
* will bind an otherwise generic Storm implementation to Heron.
*
* @param heronTopologyContext Heron topology context.
*/
@Override
public void update(org.apache.heron.api.topology.TopologyContext heronTopologyContext) {
List<Integer> newTaskIds =
heronTopologyContext.getComponentTasks(heronTopologyContext.getThisComponentId());
System.out.println("Bolt updated with new topologyContext. New taskIds: " + newTaskIds);
}
}
}