| /** |
| * 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.*; |
| import java.util.*; |
| import junit.framework.TestCase; |
| |
| import org.apache.commons.logging.*; |
| import org.apache.hadoop.fs.*; |
| import org.apache.hadoop.io.*; |
| import org.apache.hadoop.io.compress.*; |
| import org.apache.hadoop.util.LineReader; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| public class TestKeyValueTextInputFormat extends TestCase { |
| private static final Log LOG = |
| LogFactory.getLog(TestKeyValueTextInputFormat.class.getName()); |
| |
| private static int MAX_LENGTH = 10000; |
| |
| private static JobConf defaultConf = new JobConf(); |
| private static FileSystem localFs = null; |
| static { |
| try { |
| localFs = FileSystem.getLocal(defaultConf); |
| } catch (IOException e) { |
| throw new RuntimeException("init failure", e); |
| } |
| } |
| private static Path workDir = |
| new Path(new Path(System.getProperty("test.build.data", "."), "data"), |
| "TestKeyValueTextInputFormat"); |
| |
| public void testFormat() throws Exception { |
| JobConf job = new JobConf(); |
| Path file = new Path(workDir, "test.txt"); |
| |
| // A reporter that does nothing |
| Reporter reporter = Reporter.NULL; |
| |
| int seed = new Random().nextInt(); |
| LOG.info("seed = "+seed); |
| Random random = new Random(seed); |
| |
| localFs.delete(workDir, true); |
| FileInputFormat.setInputPaths(job, workDir); |
| |
| // for a variety of lengths |
| for (int length = 0; length < MAX_LENGTH; |
| length+= random.nextInt(MAX_LENGTH/10)+1) { |
| |
| LOG.debug("creating; entries = " + length); |
| |
| // create a file with length entries |
| Writer writer = new OutputStreamWriter(localFs.create(file)); |
| try { |
| for (int i = 0; i < length; i++) { |
| writer.write(Integer.toString(i*2)); |
| writer.write("\t"); |
| writer.write(Integer.toString(i)); |
| writer.write("\n"); |
| } |
| } finally { |
| writer.close(); |
| } |
| |
| // try splitting the file in a variety of sizes |
| KeyValueTextInputFormat format = new KeyValueTextInputFormat(); |
| format.configure(job); |
| for (int i = 0; i < 3; i++) { |
| int numSplits = random.nextInt(MAX_LENGTH/20)+1; |
| LOG.debug("splitting: requesting = " + numSplits); |
| InputSplit[] splits = format.getSplits(job, numSplits); |
| LOG.debug("splitting: got = " + splits.length); |
| |
| // check each split |
| BitSet bits = new BitSet(length); |
| for (int j = 0; j < splits.length; j++) { |
| LOG.debug("split["+j+"]= " + splits[j]); |
| RecordReader<Text, Text> reader = |
| format.getRecordReader(splits[j], job, reporter); |
| Class readerClass = reader.getClass(); |
| assertEquals("reader class is KeyValueLineRecordReader.", KeyValueLineRecordReader.class, readerClass); |
| |
| Text key = reader.createKey(); |
| Class keyClass = key.getClass(); |
| Text value = reader.createValue(); |
| Class valueClass = value.getClass(); |
| assertEquals("Key class is Text.", Text.class, keyClass); |
| assertEquals("Value class is Text.", Text.class, valueClass); |
| try { |
| int count = 0; |
| while (reader.next(key, value)) { |
| int v = Integer.parseInt(value.toString()); |
| LOG.debug("read " + v); |
| if (bits.get(v)) { |
| LOG.warn("conflict with " + v + |
| " in split " + j + |
| " at position "+reader.getPos()); |
| } |
| assertFalse("Key in multiple partitions.", bits.get(v)); |
| bits.set(v); |
| count++; |
| } |
| LOG.debug("splits["+j+"]="+splits[j]+" count=" + count); |
| } finally { |
| reader.close(); |
| } |
| } |
| assertEquals("Some keys in no partition.", length, bits.cardinality()); |
| } |
| |
| } |
| } |
| private LineReader makeStream(String str) throws IOException { |
| return new LineReader(new ByteArrayInputStream |
| (str.getBytes("UTF-8")), |
| defaultConf); |
| } |
| |
| public void testUTF8() throws Exception { |
| LineReader in = makeStream("abcd\u20acbdcd\u20ac"); |
| Text line = new Text(); |
| in.readLine(line); |
| assertEquals("readLine changed utf8 characters", |
| "abcd\u20acbdcd\u20ac", line.toString()); |
| in = makeStream("abc\u200axyz"); |
| in.readLine(line); |
| assertEquals("split on fake newline", "abc\u200axyz", line.toString()); |
| } |
| |
| public void testNewLines() throws Exception { |
| LineReader in = makeStream("a\nbb\n\nccc\rdddd\r\neeeee"); |
| Text out = new Text(); |
| in.readLine(out); |
| assertEquals("line1 length", 1, out.getLength()); |
| in.readLine(out); |
| assertEquals("line2 length", 2, out.getLength()); |
| in.readLine(out); |
| assertEquals("line3 length", 0, out.getLength()); |
| in.readLine(out); |
| assertEquals("line4 length", 3, out.getLength()); |
| in.readLine(out); |
| assertEquals("line5 length", 4, out.getLength()); |
| in.readLine(out); |
| assertEquals("line5 length", 5, out.getLength()); |
| assertEquals("end of file", 0, in.readLine(out)); |
| } |
| |
| private static void writeFile(FileSystem fs, Path name, |
| CompressionCodec codec, |
| String contents) throws IOException { |
| OutputStream stm; |
| if (codec == null) { |
| stm = fs.create(name); |
| } else { |
| stm = codec.createOutputStream(fs.create(name)); |
| } |
| stm.write(contents.getBytes()); |
| stm.close(); |
| } |
| |
| private static final Reporter voidReporter = Reporter.NULL; |
| |
| private static List<Text> readSplit(KeyValueTextInputFormat format, |
| InputSplit split, |
| JobConf job) throws IOException { |
| List<Text> result = new ArrayList<Text>(); |
| RecordReader<Text, Text> reader = format.getRecordReader(split, job, |
| voidReporter); |
| Text key = reader.createKey(); |
| Text value = reader.createValue(); |
| while (reader.next(key, value)) { |
| result.add(value); |
| value = reader.createValue(); |
| } |
| return result; |
| } |
| |
| /** |
| * Test using the gzip codec for reading |
| */ |
| public static void testGzip() throws IOException { |
| JobConf job = new JobConf(); |
| CompressionCodec gzip = new GzipCodec(); |
| ReflectionUtils.setConf(gzip, job); |
| localFs.delete(workDir, true); |
| writeFile(localFs, new Path(workDir, "part1.txt.gz"), gzip, |
| "line-1\tthe quick\nline-2\tbrown\nline-3\tfox jumped\nline-4\tover\nline-5\t the lazy\nline-6\t dog\n"); |
| writeFile(localFs, new Path(workDir, "part2.txt.gz"), gzip, |
| "line-1\tthis is a test\nline-1\tof gzip\n"); |
| FileInputFormat.setInputPaths(job, workDir); |
| KeyValueTextInputFormat format = new KeyValueTextInputFormat(); |
| format.configure(job); |
| InputSplit[] splits = format.getSplits(job, 100); |
| assertEquals("compressed splits == 2", 2, splits.length); |
| FileSplit tmp = (FileSplit) splits[0]; |
| if (tmp.getPath().getName().equals("part2.txt.gz")) { |
| splits[0] = splits[1]; |
| splits[1] = tmp; |
| } |
| List<Text> results = readSplit(format, splits[0], job); |
| assertEquals("splits[0] length", 6, results.size()); |
| assertEquals("splits[0][5]", " dog", results.get(5).toString()); |
| results = readSplit(format, splits[1], job); |
| assertEquals("splits[1] length", 2, results.size()); |
| assertEquals("splits[1][0]", "this is a test", |
| results.get(0).toString()); |
| assertEquals("splits[1][1]", "of gzip", |
| results.get(1).toString()); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| new TestKeyValueTextInputFormat().testFormat(); |
| } |
| } |