| /** |
| * 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.crunch; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import org.apache.crunch.Target.WriteMode; |
| import org.apache.crunch.impl.mr.MRPipeline; |
| import org.apache.crunch.io.To; |
| import org.apache.crunch.test.TemporaryPath; |
| import org.apache.crunch.test.TemporaryPaths; |
| import org.apache.crunch.types.avro.Avros; |
| import org.apache.hadoop.fs.Path; |
| import org.junit.Rule; |
| import org.junit.Test; |
| |
| public class CheckpointIT { |
| |
| @Rule |
| public TemporaryPath tmpDir = TemporaryPaths.create(); |
| |
| @Test |
| public void testCheckpoints() throws Exception { |
| String inputPath = tmpDir.copyResourceFileName("shakes.txt"); |
| Thread.sleep(2000); |
| Pipeline p = new MRPipeline(CheckpointIT.class); |
| String inter = tmpDir.getFileName("intermediate"); |
| PipelineResult one = run(p, tmpDir, inputPath, inter, false); |
| assertTrue(one.succeeded()); |
| assertEquals(2, one.getStageResults().size()); |
| PipelineResult two = run(p, tmpDir, inputPath, inter, false); |
| assertTrue(two.succeeded()); |
| assertEquals(1, two.getStageResults().size()); |
| } |
| |
| @Test |
| public void testUnsuccessfulCheckpoint() throws Exception { |
| String inputPath = tmpDir.copyResourceFileName("shakes.txt"); |
| Pipeline p = new MRPipeline(CheckpointIT.class); |
| String inter = tmpDir.getFileName("intermediate"); |
| PipelineResult one = run(p, tmpDir, inputPath, inter, true); |
| assertFalse(one.succeeded()); |
| PipelineResult two = run(p, tmpDir, inputPath, inter, false); |
| assertTrue(two.succeeded()); |
| assertEquals(2, two.getStageResults().size()); |
| } |
| |
| @Test |
| public void testModifiedFileCheckpoint() throws Exception { |
| String inputPath = tmpDir.copyResourceFileName("shakes.txt"); |
| Pipeline p = new MRPipeline(CheckpointIT.class); |
| Path inter = tmpDir.getPath("intermediate"); |
| PipelineResult one = run(p, tmpDir, inputPath, inter.toString(), false); |
| assertTrue(one.succeeded()); |
| assertEquals(2, one.getStageResults().size()); |
| // Update the input path |
| inputPath = tmpDir.copyResourceFileName("shakes.txt"); |
| PipelineResult two = run(p, tmpDir, inputPath, inter.toString(), false); |
| assertTrue(two.succeeded()); |
| assertEquals(2, two.getStageResults().size()); |
| } |
| |
| public static PipelineResult run(Pipeline pipeline, TemporaryPath tmpDir, |
| String shakesInputPath, String intermediatePath, |
| final boolean fail) { |
| PCollection<String> shakes = pipeline.readTextFile(shakesInputPath); |
| PTable<String, Long> cnts = shakes.parallelDo("split words", new DoFn<String, String>() { |
| @Override |
| public void process(String line, Emitter<String> emitter) { |
| if (fail) { |
| throw new RuntimeException("Failure!"); |
| } |
| for (String word : line.split("\\s+")) { |
| emitter.emit(word); |
| } |
| } |
| }, Avros.strings()).count(); |
| cnts.write(To.avroFile(intermediatePath), WriteMode.CHECKPOINT); |
| PTable<String, Long> singleCounts = cnts.keys().count(); |
| singleCounts.write(To.textFile(tmpDir.getFileName("singleCounts")), WriteMode.OVERWRITE); |
| return pipeline.run(); |
| } |
| } |