org.apache.carbondata.sdk.file.ConcurrentSdkReaderTest.java Source code

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Here is the source code for org.apache.carbondata.sdk.file.ConcurrentSdkReaderTest.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,
 * 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.carbondata.sdk.file;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import org.apache.carbondata.core.metadata.datatype.DataTypes;

import org.apache.commons.io.FileUtils;
import org.junit.*;

/**
 * multi-thread Test suite for {@link CarbonReader}
 */
public class ConcurrentSdkReaderTest {

    private static final String dataDir = "./testReadFiles";

    @Before
    @After
    public void cleanTestData() {
        try {
            FileUtils.deleteDirectory(new File(dataDir));
        } catch (Exception e) {
            e.printStackTrace();
            Assert.fail(e.getMessage());
        }
    }

    private void writeDataMultipleFiles(int numFiles, long numRowsPerFile) {
        Field[] fields = new Field[2];
        fields[0] = new Field("stringField", DataTypes.STRING);
        fields[1] = new Field("intField", DataTypes.INT);

        for (int numFile = 0; numFile < numFiles; ++numFile) {
            CarbonWriterBuilder builder = CarbonWriter.builder().outputPath(dataDir)
                    .withCsvInput(new Schema(fields)).writtenBy("ConcurrentSdkReaderTest");

            try {
                CarbonWriter writer = builder.build();

                for (long i = 0; i < numRowsPerFile; ++i) {
                    writer.write(new String[] { "robot_" + i, String.valueOf(i) });
                }
                writer.close();
            } catch (Exception e) {
                e.printStackTrace();
                Assert.fail(e.getMessage());
            }
        }
    }

    @Test
    public void testReadParallely() throws IOException, InterruptedException {
        int numFiles = 10;
        int numRowsPerFile = 10;
        short numThreads = 4;
        writeDataMultipleFiles(numFiles, numRowsPerFile);
        long count;

        // Sequential Reading
        CarbonReader reader = CarbonReader.builder(dataDir).build();
        try {
            count = 0;
            long start = System.currentTimeMillis();
            while (reader.hasNext()) {
                reader.readNextRow();
                count += 1;
            }
            long end = System.currentTimeMillis();
            System.out.println("[Sequential read] Time: " + (end - start) + " ms");
            Assert.assertEquals(numFiles * numRowsPerFile, count);
        } catch (Exception e) {
            e.printStackTrace();
            Assert.fail(e.getMessage());
        } finally {
            reader.close();
        }

        // Concurrent Reading
        ExecutorService executorService = Executors.newFixedThreadPool(numThreads);
        try {
            CarbonReader reader2 = CarbonReader.builder(dataDir).build();
            List<CarbonReader> multipleReaders = reader2.split(numThreads);
            try {
                List<ReadLogic> tasks = new ArrayList<>();
                List<Future<Long>> results;
                count = 0;

                for (CarbonReader reader_i : multipleReaders) {
                    tasks.add(new ReadLogic(reader_i));
                }
                long start = System.currentTimeMillis();
                results = executorService.invokeAll(tasks);
                for (Future result_i : results) {
                    count += (long) result_i.get();
                }
                long end = System.currentTimeMillis();
                System.out.println("[Parallel read] Time: " + (end - start) + " ms");
                Assert.assertEquals(numFiles * numRowsPerFile, count);
            } catch (Exception e) {
                e.printStackTrace();
                Assert.fail(e.getMessage());
            }
        } catch (Exception e) {
            e.printStackTrace();
            Assert.fail(e.getMessage());
        } finally {
            executorService.shutdown();
            executorService.awaitTermination(10, TimeUnit.MINUTES);
        }
    }

    class ReadLogic implements Callable<Long> {
        CarbonReader reader;

        ReadLogic(CarbonReader reader) {
            this.reader = reader;
        }

        @Override
        public Long call() throws IOException {
            long count = 0;
            try {
                while (reader.hasNext()) {
                    reader.readNextRow();
                    count += 1;
                }
            } catch (Exception e) {
                e.printStackTrace();
                Assert.fail(e.getMessage());
            } finally {
                reader.close();
            }
            return count;
        }
    }

}