TestMultiFileInputFormat.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.hadoop.mapred;
- import java.io.IOException;
- import java.util.BitSet;
- import java.util.HashMap;
- import java.util.Random;
- import junit.framework.TestCase;
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import org.apache.hadoop.fs.FSDataOutputStream;
- import org.apache.hadoop.fs.FileSystem;
- import org.apache.hadoop.fs.Path;
- import org.apache.hadoop.io.Text;
- public class TestMultiFileInputFormat extends TestCase{
- private static JobConf job = new JobConf();
- private static final Log LOG = LogFactory.getLog(TestMultiFileInputFormat.class);
-
- private static final int MAX_SPLIT_COUNT = 10000;
- private static final int SPLIT_COUNT_INCR = 6000;
- private static final int MAX_BYTES = 1024;
- private static final int MAX_NUM_FILES = 10000;
- private static final int NUM_FILES_INCR = 8000;
-
- private Random rand = new Random(System.currentTimeMillis());
- private HashMap<String, Long> lengths = new HashMap<String, Long>();
-
- /** Dummy class to extend MultiFileInputFormat*/
- private class DummyMultiFileInputFormat extends MultiFileInputFormat<Text, Text> {
- @Override
- public RecordReader<Text,Text> getRecordReader(InputSplit split, JobConf job
- , Reporter reporter) throws IOException {
- return null;
- }
- }
-
- private Path initFiles(FileSystem fs, int numFiles, int numBytes) throws IOException{
- Path dir = new Path(System.getProperty("test.build.data",".") + "/mapred");
- Path multiFileDir = new Path(dir, "test.multifile");
- fs.delete(multiFileDir, true);
- fs.mkdirs(multiFileDir);
- LOG.info("Creating " + numFiles + " file(s) in " + multiFileDir);
- for(int i=0; i<numFiles ;i++) {
- Path path = new Path(multiFileDir, "file_" + i);
- FSDataOutputStream out = fs.create(path);
- if (numBytes == -1) {
- numBytes = rand.nextInt(MAX_BYTES);
- }
- for(int j=0; j< numBytes; j++) {
- out.write(rand.nextInt());
- }
- out.close();
- if(LOG.isDebugEnabled()) {
- LOG.debug("Created file " + path + " with length " + numBytes);
- }
- lengths.put(path.getName(), new Long(numBytes));
- }
- FileInputFormat.setInputPaths(job, multiFileDir);
- return multiFileDir;
- }
-
- public void testFormat() throws IOException {
- if(LOG.isInfoEnabled()) {
- LOG.info("Test started");
- LOG.info("Max split count = " + MAX_SPLIT_COUNT);
- LOG.info("Split count increment = " + SPLIT_COUNT_INCR);
- LOG.info("Max bytes per file = " + MAX_BYTES);
- LOG.info("Max number of files = " + MAX_NUM_FILES);
- LOG.info("Number of files increment = " + NUM_FILES_INCR);
- }
-
- MultiFileInputFormat<Text,Text> format = new DummyMultiFileInputFormat();
- FileSystem fs = FileSystem.getLocal(job);
-
- for(int numFiles = 1; numFiles< MAX_NUM_FILES ;
- numFiles+= (NUM_FILES_INCR / 2) + rand.nextInt(NUM_FILES_INCR / 2)) {
-
- Path dir = initFiles(fs, numFiles, -1);
- BitSet bits = new BitSet(numFiles);
- for(int i=1;i< MAX_SPLIT_COUNT ;i+= rand.nextInt(SPLIT_COUNT_INCR) + 1) {
- LOG.info("Running for Num Files=" + numFiles + ", split count=" + i);
-
- MultiFileSplit[] splits = (MultiFileSplit[])format.getSplits(job, i);
- bits.clear();
-
- for(MultiFileSplit split : splits) {
- long splitLength = 0;
- for(Path p : split.getPaths()) {
- long length = fs.getContentSummary(p).getLength();
- assertEquals(length, lengths.get(p.getName()).longValue());
- splitLength += length;
- String name = p.getName();
- int index = Integer.parseInt(
- name.substring(name.lastIndexOf("file_") + 5));
- assertFalse(bits.get(index));
- bits.set(index);
- }
- assertEquals(splitLength, split.getLength());
- }
- }
- assertEquals(bits.cardinality(), numFiles);
- fs.delete(dir, true);
- }
- LOG.info("Test Finished");
- }
-
- public void testFormatWithLessPathsThanSplits() throws Exception {
- MultiFileInputFormat<Text,Text> format = new DummyMultiFileInputFormat();
- FileSystem fs = FileSystem.getLocal(job);
-
- // Test with no path
- initFiles(fs, 0, -1);
- assertEquals(0, format.getSplits(job, 2).length);
-
- // Test with 2 path and 4 splits
- initFiles(fs, 2, 500);
- assertEquals(2, format.getSplits(job, 4).length);
- }
-
- public static void main(String[] args) throws Exception{
- TestMultiFileInputFormat test = new TestMultiFileInputFormat();
- test.testFormat();
- }
- }