HadoopMapReduceErrorResilienceTest.java

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 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.ignite.internal.processors.hadoop.impl;

import org.apache.ignite.igfs.IgfsPath;
import org.apache.ignite.internal.processors.hadoop.impl.examples.HadoopWordCount2;

/**
 * Test of error resiliency after an error in a map-reduce job execution.
 * Combinations tested:
 * { new ALI, old API }
 *   x { unchecked exception, checked exception, error }
 *   x { phase where the error happens }.
 */
public class HadoopMapReduceErrorResilienceTest extends HadoopAbstractMapReduceTest {
    /**
     * Tests recovery.
     *
     * @throws Exception If failed.
     */
    public void testRecoveryAfterAnError0_Runtime() throws Exception {
        doTestRecoveryAfterAnError(0, HadoopErrorSimulator.Kind.Runtime);
    }

    /**
     * Tests recovery.
     *
     * @throws Exception If failed.
     */
    public void testRecoveryAfterAnError0_IOException() throws Exception {
        doTestRecoveryAfterAnError(0, HadoopErrorSimulator.Kind.IOException);
    }

    /**
     * Tests recovery.
     *
     * @throws Exception If failed.
     */
    public void testRecoveryAfterAnError0_Error() throws Exception {
        doTestRecoveryAfterAnError(0, HadoopErrorSimulator.Kind.Error);
    }

    /**
     * Tests recovery.
     *
     * @throws Exception If failed.
     */
    public void testRecoveryAfterAnError7_Runtime() throws Exception {
        doTestRecoveryAfterAnError(7, HadoopErrorSimulator.Kind.Runtime);
    }
    /**
     * Tests recovery.
     *
     * @throws Exception If failed.
     */
    public void testRecoveryAfterAnError7_IOException() throws Exception {
        doTestRecoveryAfterAnError(7, HadoopErrorSimulator.Kind.IOException);
    }
    /**
     * Tests recovery.
     *
     * @throws Exception If failed.
     */
    public void testRecoveryAfterAnError7_Error() throws Exception {
        doTestRecoveryAfterAnError(7, HadoopErrorSimulator.Kind.Error);
    }

    /** {@inheritDoc} */
    @Override protected long getTestTimeout() {
        return 10 * 60 * 1000L;
    }

    /**
     * Tests correct work after an error.
     *
     * @throws Exception On error.
     */
    private void doTestRecoveryAfterAnError(int useNewBits, HadoopErrorSimulator.Kind simulatorKind) throws Exception {
        try {
            IgfsPath inDir = new IgfsPath(PATH_INPUT);

            igfs.mkdirs(inDir);

            IgfsPath inFile = new IgfsPath(inDir, HadoopWordCount2.class.getSimpleName() + "-input");

            generateTestFile(inFile.toString(), "red", red, "blue", blue, "green", green, "yellow", yellow);

            boolean useNewMapper = (useNewBits & 1) == 0;
            boolean useNewCombiner = (useNewBits & 2) == 0;
            boolean useNewReducer = (useNewBits & 4) == 0;

            for (int i = 0; i < 12; i++) {
                int bits = 1 << i;

                System.out.println("############################ Simulator kind = " + simulatorKind
                    + ", Stage bits = " + bits);

                HadoopErrorSimulator sim = HadoopErrorSimulator.create(simulatorKind, bits);

                doTestWithErrorSimulator(sim, inFile, useNewMapper, useNewCombiner, useNewReducer);
            }
        } catch (Throwable t) {
            t.printStackTrace();

            fail("Unexpected throwable: " + t);
        }
    }

    /**
     * Performs test with given error simulator.
     *
     * @param sim The simulator.
     * @param inFile Input file.
     * @param useNewMapper If the use new mapper API.
     * @param useNewCombiner If to use new combiner.
     * @param useNewReducer If to use new reducer API.
     * @throws Exception If failed.
     */
    private void doTestWithErrorSimulator(HadoopErrorSimulator sim, IgfsPath inFile, boolean useNewMapper,
        boolean useNewCombiner, boolean useNewReducer) throws Exception {
        // Set real simulating error simulator:
        assertTrue(HadoopErrorSimulator.setInstance(HadoopErrorSimulator.noopInstance, sim));

        try {
            // Expect failure there:
            doTest(inFile, useNewMapper, useNewCombiner, useNewReducer);
        }
        catch (Throwable t) { // This may be an Error.
            // Expected:
            System.out.println(t.toString()); // Ignore, continue the test.
        }

        // Set no-op error simulator:
        assertTrue(HadoopErrorSimulator.setInstance(sim, HadoopErrorSimulator.noopInstance));

        // Expect success there:
        doTest(inFile, useNewMapper, useNewCombiner, useNewReducer);
    }
}