okumin commented on code in PR #320: URL: https://github.com/apache/tez/pull/320#discussion_r1703177496
########## tez-examples/src/main/java/org/apache/tez/examples/Demuxer.java: ########## @@ -0,0 +1,231 @@ +/** + * 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.tez.examples; + +import java.util.Arrays; +import java.util.List; +import java.util.stream.Collectors; +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.io.NullWritable; +import org.apache.hadoop.io.Text; +import org.apache.hadoop.mapreduce.lib.input.TextInputFormat; +import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; +import org.apache.hadoop.util.ToolRunner; +import org.apache.tez.client.TezClient; +import org.apache.tez.common.Preconditions; +import org.apache.tez.dag.api.DAG; +import org.apache.tez.dag.api.Edge; +import org.apache.tez.dag.api.GroupInputEdge; +import org.apache.tez.dag.api.InputDescriptor; +import org.apache.tez.dag.api.ProcessorDescriptor; +import org.apache.tez.dag.api.TezConfiguration; +import org.apache.tez.dag.api.Vertex; +import org.apache.tez.dag.library.vertexmanager.FairShuffleVertexManager; +import org.apache.tez.dag.library.vertexmanager.FairShuffleVertexManager.FairRoutingType; +import org.apache.tez.examples.HashJoinExample.ForwardingProcessor; +import org.apache.tez.mapreduce.input.MRInput; +import org.apache.tez.mapreduce.output.MultiMROutput; +import org.apache.tez.mapreduce.processor.SimpleMRProcessor; +import org.apache.tez.runtime.api.LogicalInput; +import org.apache.tez.runtime.api.ProcessorContext; +import org.apache.tez.runtime.library.api.KeyValueWriterWithBasePath; +import org.apache.tez.runtime.library.api.KeyValuesReader; +import org.apache.tez.runtime.library.api.TezRuntimeConfiguration; +import org.apache.tez.runtime.library.api.TezRuntimeConfiguration.ReportPartitionStats; +import org.apache.tez.runtime.library.conf.OrderedPartitionedKVEdgeConfig; +import org.apache.tez.runtime.library.input.ConcatenatedMergedKeyValuesInput; +import org.apache.tez.runtime.library.partitioner.HashPartitioner; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Simple example of a demuxer tolerant of data skew problems. The example scans the source files, + * partitions records by values, and write them in /path/to/{value}-r-{task id}. + */ +public class Demuxer extends TezExampleBase { + private static final Logger LOG = LoggerFactory.getLogger(Demuxer.class); + + private static final String DEMUXER_OUTPUT = "demuxerOutput"; + + public static void main(String[] args) throws Exception { + Demuxer job = new Demuxer(); + int status = ToolRunner.run(new Configuration(), job, args); + System.exit(status); + } + + @Override + protected void printUsage() { + System.err.println("Usage: " + + "demuxer <inputPath> <outPath> <numPartitions> [isPrecise(default false)]"); + } + + @Override + protected int validateArgs(String[] otherArgs) { + if (otherArgs.length < 3 || otherArgs.length > 4) { + return 2; + } + return 0; + } + + @Override + protected int runJob(String[] args, TezConfiguration tezConf, TezClient tezClient) + throws Exception { + String inputDirs = args[0]; + String outputDir = args[1]; + int numPartitions = Integer.parseInt(args[2]); + if (args.length == 4 && Boolean.parseBoolean(args[3])) { + tezConf.set( + TezRuntimeConfiguration.TEZ_RUNTIME_REPORT_PARTITION_STATS, + ReportPartitionStats.PRECISE.getType()); + } + + List<Path> inputPaths = Arrays + .stream(inputDirs.split(",")) + .map(Path::new) + .collect(Collectors.toList()); + Path outputPath = new Path(outputDir); + + FileSystem fs = outputPath.getFileSystem(tezConf); + outputPath = fs.makeQualified(outputPath); + if (fs.exists(outputPath)) { + System.err.println("Output directory: " + outputDir + " already exists"); + return 3; + } + DAG dag = inputPaths.size() == 1 + ? createDag(tezConf, inputPaths.get(0), outputPath, numPartitions) + : createDagWithUnion(tezConf, inputPaths, outputPath, numPartitions); + LOG.info("Running Demuxer"); + return runDag(dag, isCountersLog(), LOG); + } + + private DAG createDag(TezConfiguration tezConf, Path inputPath, Path outputPath, + int numPartitions) { + Vertex inputVertex = createInputVertex(tezConf, "input", inputPath); + Vertex demuxVertex = createDemuxVertex(tezConf, outputPath, numPartitions); + OrderedPartitionedKVEdgeConfig edgeConf = OrderedPartitionedKVEdgeConfig + .newBuilder( + Text.class.getName(), + NullWritable.class.getName(), + HashPartitioner.class.getName()) + .setFromConfiguration(tezConf) + .build(); + return DAG + .create("Demuxer") + .addVertex(inputVertex) + .addVertex(demuxVertex) + .addEdge(Edge.create(inputVertex, demuxVertex, edgeConf.createDefaultEdgeProperty())); + } + + private DAG createDagWithUnion(TezConfiguration tezConf, List<Path> inputPaths, Path outputPath, Review Comment: @abstractdog Thanks for asking. I closed #306 and still need to implement an alternative solution. At this point, I removed the case using UNION from the sample. https://github.com/apache/tez/pull/320/commits/9e0966541383e305d4505f23178aaebfc90181b5 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
