/**
* 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 TestTextInputFormat extends TestCase {
private static final Log LOG =
LogFactory.getLog(TestTextInputFormat.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"),
"TestTextInputFormat");
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));
writer.write("\n");
}
} finally {
writer.close();
}
// try splitting the file in a variety of sizes
TextInputFormat format = new TextInputFormat();
format.configure(job);
LongWritable key = new LongWritable();
Text value = new Text();
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);
if (length == 0) {
assertEquals("Files of length 0 are not returned from FileInputFormat.getSplits().",
1, splits.length);
assertEquals("Empty file length == 0", 0, splits[0].getLength());
}
// check each split
BitSet bits = new BitSet(length);
for (int j = 0; j < splits.length; j++) {
LOG.debug("split["+j+"]= " + splits[j]);
RecordReader<LongWritable, Text> reader =
format.getRecordReader(splits[j], job, reporter);
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 static 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));
}
public void testMaxLineLength() throws Exception {
LineReader in = makeStream("a\nbb\n\nccc\rdddd\r\neeeee");
Text out = new Text();
in.readLine(out, 1);
assertEquals("line1 length", 1, out.getLength());
in.readLine(out, 1);
assertEquals("line2 length", 1, out.getLength());
in.readLine(out, 1);
assertEquals("line3 length", 0, out.getLength());
in.readLine(out, 3);
assertEquals("line4 length", 3, out.getLength());
in.readLine(out, 10);
assertEquals("line5 length", 4, out.getLength());
in.readLine(out, 8);
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(TextInputFormat format,
InputSplit split,
JobConf job) throws IOException {
List<Text> result = new ArrayList<Text>();
RecordReader<LongWritable, Text> reader =
format.getRecordReader(split, job, voidReporter);
LongWritable key = reader.createKey();
Text value = reader.createValue();
while (reader.next(key, value)) {
result.add(value);
value = (Text) reader.createValue();
}
reader.close();
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,
"the quick\nbrown\nfox jumped\nover\n the lazy\n dog\n");
writeFile(localFs, new Path(workDir, "part2.txt.gz"), gzip,
"this is a test\nof gzip\n");
FileInputFormat.setInputPaths(job, workDir);
TextInputFormat format = new TextInputFormat();
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());
}
/**
* Test using the gzip codec and an empty input file
*/
public static void testGzipEmpty() throws IOException {
JobConf job = new JobConf();
CompressionCodec gzip = new GzipCodec();
ReflectionUtils.setConf(gzip, job);
localFs.delete(workDir, true);
writeFile(localFs, new Path(workDir, "empty.gz"), gzip, "");
FileInputFormat.setInputPaths(job, workDir);
TextInputFormat format = new TextInputFormat();
format.configure(job);
InputSplit[] splits = format.getSplits(job, 100);
assertEquals("Compressed files of length 0 are not returned from FileInputFormat.getSplits().",
1, splits.length);
List<Text> results = readSplit(format, splits[0], job);
assertEquals("Compressed empty file length == 0", 0, results.size());
}
private static String unquote(String in) {
StringBuffer result = new StringBuffer();
for(int i=0; i < in.length(); ++i) {
char ch = in.charAt(i);
if (ch == '\\') {
ch = in.charAt(++i);
switch (ch) {
case 'n':
result.append('\n');
break;
case 'r':
result.append('\r');
break;
default:
result.append(ch);
break;
}
} else {
result.append(ch);
}
}
return result.toString();
}
/**
* Parse the command line arguments into lines and display the result.
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
for(String arg: args) {
System.out.println("Working on " + arg);
LineReader reader = makeStream(unquote(arg));
Text line = new Text();
int size = reader.readLine(line);
while (size > 0) {
System.out.println("Got: " + line.toString());
size = reader.readLine(line);
}
reader.close();
}
}
}