/**
* 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 org.apache.crunch.impl.mr.MRPipeline;
import org.apache.crunch.impl.mr.exec.MRExecutor;
import org.apache.crunch.io.From;
import org.apache.crunch.io.To;
import org.apache.crunch.test.TemporaryPath;
import org.apache.crunch.test.TemporaryPaths;
import org.apache.crunch.types.writable.Writables;
import org.junit.Rule;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class BreakpointIT {
@Rule
public TemporaryPath tmpDir = TemporaryPaths.create();
@Test
public void testNoBreakpoint() throws Exception {
run(new MRPipeline(BreakpointIT.class, tmpDir.getDefaultConfiguration()),
tmpDir.copyResourceFileName("shakes.txt"),
tmpDir.getFileName("out1"),
tmpDir.getFileName("out2"),
false);
}
@Test
public void testBreakpoint() throws Exception {
run(new MRPipeline(BreakpointIT.class, tmpDir.getDefaultConfiguration()),
tmpDir.copyResourceFileName("shakes.txt"),
tmpDir.getFileName("out1"),
tmpDir.getFileName("out2"),
true);
}
public static void run(MRPipeline pipeline, String input, String out1, String out2, boolean breakpoint)
throws Exception {
// Read a line from a file to get a PCollection.
PCollection<String> pCol1 = pipeline.read(From.textFile(input));
// Create a PTable from PCollection
PTable<String, Integer> pTable1 = pCol1.parallelDo(new DoFn<String, Pair<String, Integer>>() {
@Override
public void process(final String s, final Emitter<Pair<String, Integer>> emitter) {
for (int i = 0; i < 10; i++) {
emitter.emit(new Pair<String, Integer>(s, i));
}
}
}, Writables.tableOf(Writables.strings(), Writables.ints()));
// Do a groupByKey
PGroupedTable<String, Integer> pGrpTable1 = pTable1.groupByKey();
// Select from PGroupedTable
PTable<String, Integer> selectFromPTable1 = pGrpTable1.parallelDo(
new DoFn<Pair<String, Iterable<Integer>>, Pair<String, Integer>>() {
@Override
public void process(final Pair<String, Iterable<Integer>> input,
final Emitter<Pair<String, Integer>> emitter) {
emitter.emit(new Pair<String, Integer>(input.first(), input.second().iterator().next()));
}
}, Writables.tableOf(Writables.strings(), Writables.ints()));
// Process selectFromPTable1 once
final PTable<String, String> pTable2 = selectFromPTable1.parallelDo(new DoFn<Pair<String, Integer>, Pair<String, String>>() {
@Override
public void process(final Pair<String, Integer> input, final Emitter<Pair<String, String>> emitter) {
final Integer newInt = input.second() + 5;
increment("job", "table2");
emitter.emit(new Pair<String, String>(newInt.toString(), input.first()));
}
}, Writables.tableOf(Writables.strings(), Writables.strings()));
// Process selectFromPTable1 once more
PTable<String, String> pTable3 = selectFromPTable1.parallelDo(new DoFn<Pair<String, Integer>, Pair<String, String>>() {
@Override
public void process(final Pair<String, Integer> input, final Emitter<Pair<String, String>> emitter) {
final Integer newInt = input.second() + 10;
increment("job", "table3");
emitter.emit(new Pair<String, String>(newInt.toString(), input.first()));
}
}, Writables.tableOf(Writables.strings(), Writables.strings()));
// Union pTable2 and pTable3 and set a breakpoint
PTable<String, String> pTable4 = pTable2.union(pTable3);
if (breakpoint) {
pTable4.materialize();
}
// Write keys
pTable4.keys().write(To.textFile(out1));
// Group values
final PGroupedTable<String, String> pGrpTable3 = pTable4.groupByKey();
// Write values
pGrpTable3.ungroup().write(To.textFile(out2));
MRExecutor exec = pipeline.plan();
// Count the number of map processing steps in this pipeline
int mapsCount = 0;
for (String line : exec.getPlanDotFile().split("\n")) {
if (line.contains(" subgraph ") && line.contains("-map\" {")) {
mapsCount++;
}
}
assertEquals(breakpoint ? 1 : 2, mapsCount);
}
}