本文整理汇总了Java中org.apache.hadoop.mapred.lib.CombineTextInputFormat类的典型用法代码示例。如果您正苦于以下问题：Java CombineTextInputFormat类的具体用法？Java CombineTextInputFormat怎么用？Java CombineTextInputFormat使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
CombineTextInputFormat类属于org.apache.hadoop.mapred.lib包，在下文中一共展示了CombineTextInputFormat类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: testGzip
import org.apache.hadoop.mapred.lib.CombineTextInputFormat; //导入依赖的package包/类
/**
* Test using the gzip codec for reading
*/
@Test(timeout=10000)
public void testGzip() throws IOException {
JobConf job = new JobConf(defaultConf);
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);
CombineTextInputFormat format = new CombineTextInputFormat();
InputSplit[] splits = format.getSplits(job, 100);
assertEquals("compressed splits == 1", 1, splits.length);
List<Text> results = readSplit(format, splits[0], job);
assertEquals("splits[0] length", 8, results.size());
final String[] firstList =
{"the quick", "brown", "fox jumped", "over", " the lazy", " dog"};
final String[] secondList = {"this is a test", "of gzip"};
String first = results.get(0).toString();
if (first.equals(firstList[0])) {
testResults(results, firstList, secondList);
} else if (first.equals(secondList[0])) {
testResults(results, secondList, firstList);
} else {
fail("unexpected first token!");
}
}
示例2: testFormat
import org.apache.hadoop.mapred.lib.CombineTextInputFormat; //导入依赖的package包/类
@Test(timeout=10000)
public void testFormat() throws Exception {
JobConf job = new JobConf(defaultConf);
Random random = new Random();
long seed = random.nextLong();
LOG.info("seed = "+seed);
random.setSeed(seed);
localFs.delete(workDir, true);
FileInputFormat.setInputPaths(job, workDir);
final int length = 10000;
final int numFiles = 10;
createFiles(length, numFiles, random);
// create a combined split for the files
CombineTextInputFormat format = new CombineTextInputFormat();
LongWritable key = new LongWritable();
Text value = new Text();
for (int i = 0; i < 3; i++) {
int numSplits = random.nextInt(length/20)+1;
LOG.info("splitting: requesting = " + numSplits);
InputSplit[] splits = format.getSplits(job, numSplits);
LOG.info("splitting: got = " + splits.length);
// we should have a single split as the length is comfortably smaller than
// the block size
assertEquals("We got more than one splits!", 1, splits.length);
InputSplit split = splits[0];
assertEquals("It should be CombineFileSplit",
CombineFileSplit.class, split.getClass());
// check the split
BitSet bits = new BitSet(length);
LOG.debug("split= " + split);
RecordReader<LongWritable, Text> reader =
format.getRecordReader(split, job, voidReporter);
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 +
" at position "+reader.getPos());
}
assertFalse("Key in multiple partitions.", bits.get(v));
bits.set(v);
count++;
}
LOG.info("splits="+split+" count=" + count);
} finally {
reader.close();
}
assertEquals("Some keys in no partition.", length, bits.cardinality());
}
}