LobFilePerfTest.java Source code

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Here is the source code for LobFilePerfTest.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.
 */

import java.io.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.conf.*;
import com.cloudera.sqoop.io.*;

/**
 * A simple benchmark to performance test LobFile reader/writer speed.
 * Writes out 10 GB of data to the local disk and then reads it back.
 * Run with:
 * HADOOP_OPTS=-agentlib:hprof=cpu=samples \
 *     src/scripts/run-perftest.sh LobFilePerfTest
 */
public class LobFilePerfTest {

    private long recordLen = 20 * 1024 * 1024; // 20 MB records
    private int numRecords = 500;
    private Configuration conf;
    private Path p;
    private long startTime;
    private byte[] record;

    public LobFilePerfTest() {
        conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        p = new Path("foo.lob");
    }

    private void startTiming(String s) {
        System.out.println(s);
        startTime = System.currentTimeMillis();
    }

    private void stopTiming() {
        long finishTime = System.currentTimeMillis();
        long delta = finishTime - startTime;
        System.out.println("Finished. Time elapsed: " + delta);
    }

    private void makeRecordBody() {
        startTiming("Allocating record");
        record = new byte[(int) recordLen];
        for (long i = 0; i < recordLen; i++) {
            record[(int) i] = (byte) (i % 256);
        }
        stopTiming();
    }

    private void writeFile() throws Exception {
        startTiming("Writing " + numRecords + " records to lob file");
        LobFile.Writer w = LobFile.create(p, conf);
        for (int i = 0; i < numRecords; i++) {
            OutputStream out = w.writeBlobRecord(recordLen);
            out.write(record);
            out.close();
            w.finishRecord();
        }
        w.close();
        stopTiming();
    }

    private void readFile() throws Exception {
        startTiming("Reading from lob file");
        LobFile.Reader r = LobFile.open(p, conf);
        int receivedRecs = 0;
        byte[] inputBuffer = new byte[4096];
        long recordSize = 0;
        while (r.next()) {
            receivedRecs++;
            InputStream in = r.readBlobRecord();
            while (true) {
                int thisRead = in.read(inputBuffer);
                if (-1 == thisRead) {
                    break;
                }
                recordSize += (long) thisRead;
            }
        }
        r.close();
        stopTiming();
        System.out.println("Got " + receivedRecs + " records");
        System.out.println("Read " + recordSize + " bytes");
    }

    public void run() throws Exception {
        makeRecordBody();
        writeFile();
        readFile();
    }

    public static void main(String[] args) throws Exception {
        LobFilePerfTest test = new LobFilePerfTest();
        test.run();
    }
}