| /** |
| * 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 com.google.common.collect.Lists.newArrayList; |
| import static org.apache.crunch.io.At.sequenceFile; |
| import static org.apache.crunch.io.At.textFile; |
| import static org.apache.crunch.types.writable.Writables.strings; |
| import static org.hamcrest.Matchers.is; |
| import static org.junit.Assert.assertThat; |
| |
| import java.io.IOException; |
| |
| import org.apache.crunch.fn.FilterFns; |
| import org.apache.crunch.impl.mem.MemPipeline; |
| import org.apache.crunch.impl.mr.MRPipeline; |
| import org.apache.crunch.test.TemporaryPath; |
| import org.apache.crunch.test.TemporaryPaths; |
| import org.junit.Before; |
| import org.junit.Ignore; |
| import org.junit.Rule; |
| import org.junit.Test; |
| |
| public class PCollectionGetSizeIT { |
| @Rule |
| public TemporaryPath tmpDir = TemporaryPaths.create(); |
| |
| private String emptyInputPath; |
| private String nonEmptyInputPath; |
| private String outputPath; |
| |
| @Before |
| public void setUp() throws IOException { |
| emptyInputPath = tmpDir.copyResourceFileName("emptyTextFile.txt"); |
| nonEmptyInputPath = tmpDir.copyResourceFileName("set1.txt"); |
| outputPath = tmpDir.getFileName("output"); |
| } |
| |
| @Test |
| public void testGetSizeOfEmptyInput_MRPipeline() throws IOException { |
| testCollectionGetSizeOfEmptyInput(new MRPipeline(this.getClass(), tmpDir.getDefaultConfiguration())); |
| } |
| |
| @Test |
| public void testGetSizeOfEmptyInput_MemPipeline() throws IOException { |
| testCollectionGetSizeOfEmptyInput(MemPipeline.getInstance()); |
| } |
| |
| private void testCollectionGetSizeOfEmptyInput(Pipeline pipeline) throws IOException { |
| |
| assertThat(pipeline.read(textFile(emptyInputPath)).getSize(), is(0L)); |
| } |
| |
| @Test |
| public void testMaterializeEmptyInput_MRPipeline() throws IOException { |
| testMaterializeEmptyInput(new MRPipeline(this.getClass(), tmpDir.getDefaultConfiguration())); |
| } |
| |
| @Test |
| public void testMaterializeEmptyImput_MemPipeline() throws IOException { |
| testMaterializeEmptyInput(MemPipeline.getInstance()); |
| } |
| |
| private void testMaterializeEmptyInput(Pipeline pipeline) throws IOException { |
| assertThat(newArrayList(pipeline.readTextFile(emptyInputPath).materialize().iterator()).size(), is(0)); |
| } |
| |
| @Test |
| public void testGetSizeOfEmptyIntermediatePCollection_MRPipeline() throws IOException { |
| |
| PCollection<String> emptyIntermediate = createPesistentEmptyIntermediate( |
| new MRPipeline(this.getClass(), tmpDir.getDefaultConfiguration())); |
| |
| assertThat(emptyIntermediate.getSize(), is(0L)); |
| } |
| |
| @Test |
| @Ignore("GetSize of a DoCollection is only an estimate based on scale factor, so we can't count on it being reported as 0") |
| public void testGetSizeOfEmptyIntermediatePCollection_NoSave_MRPipeline() throws IOException { |
| |
| PCollection<String> data = new MRPipeline(this.getClass(), tmpDir.getDefaultConfiguration()) |
| .readTextFile(nonEmptyInputPath); |
| |
| PCollection<String> emptyPCollection = data.filter(FilterFns.<String>REJECT_ALL()); |
| |
| assertThat(emptyPCollection.getSize(), is(0L)); |
| } |
| |
| @Test |
| public void testGetSizeOfEmptyIntermediatePCollection_MemPipeline() { |
| |
| PCollection<String> emptyIntermediate = createPesistentEmptyIntermediate(MemPipeline.getInstance()); |
| |
| assertThat(emptyIntermediate.getSize(), is(0L)); |
| } |
| |
| @Test |
| public void testMaterializeOfEmptyIntermediatePCollection_MRPipeline() throws IOException { |
| |
| PCollection<String> emptyIntermediate = createPesistentEmptyIntermediate( |
| new MRPipeline(this.getClass(), tmpDir.getDefaultConfiguration())); |
| |
| assertThat(newArrayList(emptyIntermediate.materialize()).size(), is(0)); |
| } |
| |
| @Test |
| public void testMaterializeOfEmptyIntermediatePCollection_MemPipeline() { |
| |
| PCollection<String> emptyIntermediate = createPesistentEmptyIntermediate(MemPipeline.getInstance()); |
| |
| assertThat(newArrayList(emptyIntermediate.materialize()).size(), is(0)); |
| } |
| |
| private PCollection<String> createPesistentEmptyIntermediate(Pipeline pipeline) { |
| |
| PCollection<String> data = pipeline.readTextFile(nonEmptyInputPath); |
| |
| PCollection<String> emptyPCollection = data.filter(FilterFns.<String>REJECT_ALL()); |
| |
| emptyPCollection.write(sequenceFile(outputPath, strings())); |
| |
| pipeline.run(); |
| |
| return pipeline.read(sequenceFile(outputPath, strings())); |
| } |
| |
| @Test(expected = IllegalStateException.class) |
| public void testExpectExceptionForGettingSizeOfNonExistingFile_MRPipeline() throws IOException { |
| new MRPipeline(this.getClass(), tmpDir.getDefaultConfiguration()).readTextFile("non_existing.file").getSize(); |
| } |
| |
| @Test(expected = IllegalStateException.class) |
| public void testExpectExceptionForGettingSizeOfNonExistingFile_MemPipeline() { |
| MemPipeline.getInstance().readTextFile("non_existing.file").getSize(); |
| } |
| } |