| // Copyright 2016 Twitter. All rights reserved. |
| // |
| // Licensed 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 com.twitter.heron.examples; |
| |
| import java.util.List; |
| import java.util.Map; |
| |
| import com.twitter.heron.api.topology.IUpdatable; |
| import com.twitter.heron.common.basics.ByteAmount; |
| |
| import backtype.storm.Config; |
| import backtype.storm.LocalCluster; |
| import backtype.storm.StormSubmitter; |
| import backtype.storm.metric.api.GlobalMetrics; |
| import backtype.storm.task.OutputCollector; |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.topology.TopologyBuilder; |
| import backtype.storm.topology.base.BaseRichBolt; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.utils.Utils; |
| |
| /** |
| * 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; |
| |
| builder.setSpout("word", new TestWordSpout(), parallelism); |
| builder.setBolt("exclaim1", new ExclamationBolt(), 2 * parallelism) |
| .shuffleGrouping("word"); |
| |
| Config conf = new Config(); |
| conf.setDebug(true); |
| conf.setMaxSpoutPending(10); |
| conf.put(Config.TOPOLOGY_WORKER_CHILDOPTS, "-XX:+HeapDumpOnOutOfMemoryError"); |
| conf.setComponentRam("word", ByteAmount.fromGigabytes(3)); |
| conf.setComponentRam("exclaim1", ByteAmount.fromGigabytes(3)); |
| conf.setContainerDiskRequested(ByteAmount.fromGigabytes(5)); |
| conf.setContainerCpuRequested(5); |
| |
| if (args != null && args.length > 0) { |
| conf.setNumStmgrs(parallelism); |
| StormSubmitter.submitTopology(args[0], conf, builder.createTopology()); |
| } else { |
| System.out.println("Topology name not provided as an argument, running in simulator mode."); |
| LocalCluster cluster = new LocalCluster(); |
| cluster.submitTopology("test", conf, builder.createTopology()); |
| Utils.sleep(10000); |
| cluster.killTopology("test"); |
| cluster.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(com.twitter.heron.api.topology.TopologyContext heronTopologyContext) { |
| List<Integer> newTaskIds = |
| heronTopologyContext.getComponentTasks(heronTopologyContext.getThisComponentId()); |
| System.out.println("Bolt updated with new topologyContext. New taskIds: " + newTaskIds); |
| } |
| } |
| } |