@Override
public void initialize(InputSplit genericSplit, TaskAttemptContext taskAttemptContext)
throws IOException {
context = taskAttemptContext;
FileSplit fileSplit = (FileSplit) genericSplit;
lzoFile = fileSplit.getPath();
// The LzoSplitInputFormat is not splittable, so the split length is the whole file.
totalFileSize = fileSplit.getLength();
// Jump through some hoops to create the lzo codec.
Configuration conf = CompatibilityUtil.getConfiguration(context);
CompressionCodecFactory factory = new CompressionCodecFactory(conf);
CompressionCodec codec = factory.getCodec(lzoFile);
((Configurable) codec).setConf(conf);
LzopDecompressor lzopDecompressor = (LzopDecompressor) codec.createDecompressor();
FileSystem fs = lzoFile.getFileSystem(conf);
rawInputStream = fs.open(lzoFile);
// Creating the LzopInputStream here just reads the lzo header for us, nothing more.
// We do the rest of our input off of the raw stream is.
codec.createInputStream(rawInputStream, lzopDecompressor);
// This must be called AFTER createInputStream is called, because createInputStream
// is what reads the header, which has the checksum information. Otherwise getChecksumsCount
// erroneously returns zero, and all block offsets will be wrong.
numCompressedChecksums = lzopDecompressor.getCompressedChecksumsCount();
numDecompressedChecksums = lzopDecompressor.getDecompressedChecksumsCount();
}
@Override
public void initialize(InputSplit split, TaskAttemptContext context) throws IOException {
// Obtain path to input list of input images and open input stream
FileSplit fileSplit = (FileSplit) split;
Path path = fileSplit.getPath();
FileSystem fileSystem = path.getFileSystem(context.getConfiguration());
FSDataInputStream fileIn = fileSystem.open(path);
// Note the start and length fields in the FileSplit object are being used to
// convey a range of lines in the input list of image URLs
startLine = fileSplit.getStart();
numLines = fileSplit.getLength();
linesRead = 0; // total lines read by this particular record reader instance
linesPerRecord = 100; // can be modified to change key/value pair size (may improve efficiency)
// If it exists, get the relevant compression codec for the FileSplit
CompressionCodecFactory codecFactory = new CompressionCodecFactory(context.getConfiguration());
CompressionCodec codec = codecFactory.getCodec(path);
// If the codec was found, use it to create an decompressed input stream.
// Otherwise, assume input stream is already decompressed
if (codec != null) {
reader = new BufferedReader(new InputStreamReader(codec.createInputStream(fileIn)));
} else {
reader = new BufferedReader(new InputStreamReader(fileIn));
}
}
private void verifyCompressedFile(Path f, int expectedNumLines) throws IOException {
Configuration conf = new Configuration();
conf.set("fs.default.name", "file:///");
FileSystem fs = FileSystem.get(conf);
InputStream is = fs.open(f);
CompressionCodecFactory ccf = new CompressionCodecFactory(conf);
CompressionCodec codec = ccf.getCodec(f);
LOG.info("gzip check codec is " + codec);
Decompressor decompressor = CodecPool.getDecompressor(codec);
if (null == decompressor) {
LOG.info("Verifying gzip sanity with null decompressor");
} else {
LOG.info("Verifying gzip sanity with decompressor: " + decompressor.toString());
}
is = codec.createInputStream(is, decompressor);
BufferedReader r = new BufferedReader(new InputStreamReader(is));
int numLines = 0;
while (true) {
String ln = r.readLine();
if (ln == null) {
break;
}
numLines++;
}
r.close();
assertEquals("Did not read back correct number of lines", expectedNumLines, numLines);
LOG.info("gzip sanity check returned " + numLines + " lines; ok.");
}
/**
* Create a data file that gets exported to the db.
*
* @param fileNum the number of the file (for multi-file export)
* @param numRecords how many records to write to the file.
* @param gzip is true if the file should be gzipped.
*/
private void createTextFile(
int fileNum, int numRecords, boolean gzip, ColumnGenerator... extraCols) throws IOException {
int startId = fileNum * numRecords;
String ext = ".txt";
if (gzip) {
ext = ext + ".gz";
}
Path tablePath = getTablePath();
Path filePath = new Path(tablePath, "part" + fileNum + ext);
Configuration conf = new Configuration();
conf.set("fs.default.name", "file:///");
FileSystem fs = FileSystem.get(conf);
fs.mkdirs(tablePath);
OutputStream os = fs.create(filePath);
if (gzip) {
CompressionCodecFactory ccf = new CompressionCodecFactory(conf);
CompressionCodec codec = ccf.getCodec(filePath);
os = codec.createOutputStream(os);
}
BufferedWriter w = new BufferedWriter(new OutputStreamWriter(os));
for (int i = 0; i < numRecords; i++) {
w.write(getRecordLine(startId + i, extraCols));
}
w.close();
os.close();
if (gzip) {
verifyCompressedFile(filePath, numRecords);
}
}
public QseqRecordReader(Configuration conf, FileSplit split) throws IOException {
setConf(conf);
file = split.getPath();
start = split.getStart();
end = start + split.getLength();
FileSystem fs = file.getFileSystem(conf);
FSDataInputStream fileIn = fs.open(file);
CompressionCodecFactory codecFactory = new CompressionCodecFactory(conf);
CompressionCodec codec = codecFactory.getCodec(file);
if (codec == null) // no codec. Uncompressed file.
{
positionAtFirstRecord(fileIn);
inputStream = fileIn;
} else { // compressed file
if (start != 0)
throw new RuntimeException(
"Start position for compressed file is not 0! (found " + start + ")");
inputStream = codec.createInputStream(fileIn);
end = Long.MAX_VALUE; // read until the end of the file
}
lineReader = new LineReader(inputStream);
}
public static void decompressFile(
final FileSystem fs, final String inFile, final String outFile, boolean deletePrevious)
throws IOException {
final Path inPath = new Path(inFile);
final Path outPath = new Path(outFile);
final CompressionCodecFactory factory = new CompressionCodecFactory(new Configuration());
final CompressionCodec codec = factory.getCodec(inPath);
final OutputStream out = fs.create(outPath);
final InputStream in = codec.createInputStream(fs.open(inPath));
IOUtils.copyBytes(in, out, 8192);
IOUtils.closeStream(in);
IOUtils.closeStream(out);
if (deletePrevious) fs.delete(new Path(inFile), true);
}
/**
* Returns an {@link InputStream} to the specified file.
*
* <p>Note: It is the caller's responsibility to close the returned {@link InputStream}.
*
* @param path The path to the file to open.
* @return An {@link InputStream} for the specified file.
* @throws FileBasedHelperException if there is a problem opening the {@link InputStream} for the
* specified file.
*/
@Override
public InputStream getFileStream(String path) throws FileBasedHelperException {
try {
Path p = new Path(path);
InputStream in = this.getFileSystem().open(p);
// Account for compressed files (e.g. gzip).
// https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/input/WholeTextFileRecordReader.scala
CompressionCodecFactory factory = new CompressionCodecFactory(this.getFileSystem().getConf());
CompressionCodec codec = factory.getCodec(p);
return (codec == null) ? in : codec.createInputStream(in);
} catch (IOException e) {
throw new FileBasedHelperException(
"Cannot open file " + path + " due to " + e.getMessage(), e);
}
}
public MutilCharRecordReader(FileSplit inputSplit, Configuration job) throws IOException {
maxLineLength = job.getInt("mapred.mutilCharRecordReader.maxlength", Integer.MAX_VALUE);
start = inputSplit.getStart();
end = start + inputSplit.getLength();
final Path file = inputSplit.getPath();
compressionCodecs = new CompressionCodecFactory(job);
final CompressionCodec codec = compressionCodecs.getCodec(file);
// 打开文件系统
FileSystem fs = file.getFileSystem(job);
FSDataInputStream fileIn = fs.open(file);
boolean skipFirstLine = false;
if (codec != null) {
lineReader = new LineReader(codec.createInputStream(fileIn), job);
end = Long.MAX_VALUE;
} else {
if (start != 0) {
skipFirstLine = true;
--start;
fileIn.seek(start);
}
lineReader = new LineReader(fileIn, job);
}
if (skipFirstLine) {
start +=
lineReader.readLine(new Text(), 0, (int) Math.min((long) Integer.MAX_VALUE, end - start));
}
this.pos = start;
}
public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException {
FileSplit split = (FileSplit) genericSplit;
Configuration job = context.getConfiguration();
m_Sb.setLength(0);
m_Start = split.getStart();
m_End = m_Start + split.getLength();
final Path file = split.getPath();
compressionCodecs = new CompressionCodecFactory(job);
final CompressionCodec codec = compressionCodecs.getCodec(file);
// open the file and seek to the m_Start of the split
FileSystem fs = file.getFileSystem(job);
// getFileStatus fileStatus = fs.getFileStatus(split.getPath());
//noinspection deprecation
@SuppressWarnings(value = "deprecated")
long length = fs.getLength(file);
FSDataInputStream fileIn = fs.open(split.getPath());
if (m_Start > 0) fileIn.seek(m_Start);
if (codec != null) {
CompressionInputStream inputStream = codec.createInputStream(fileIn);
m_Input = new BufferedReader(new InputStreamReader(inputStream));
m_End = length;
} else {
m_Input = new BufferedReader(new InputStreamReader(fileIn));
}
m_Current = m_Start;
m_Key = split.getPath().getName();
}
/**
* A little test program.
*
* @param args
*/
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration();
CompressionCodecFactory factory = new CompressionCodecFactory(conf);
boolean encode = false;
for (int i = 0; i < args.length; ++i) {
if ("-in".equals(args[i])) {
encode = true;
} else if ("-out".equals(args[i])) {
encode = false;
} else {
CompressionCodec codec = factory.getCodec(new Path(args[i]));
if (codec == null) {
System.out.println("Codec for " + args[i] + " not found.");
} else {
if (encode) {
CompressionOutputStream out =
codec.createOutputStream(new java.io.FileOutputStream(args[i]));
byte[] buffer = new byte[100];
String inFilename = removeSuffix(args[i], codec.getDefaultExtension());
java.io.InputStream in = new java.io.FileInputStream(inFilename);
int len = in.read(buffer);
while (len > 0) {
out.write(buffer, 0, len);
len = in.read(buffer);
}
in.close();
out.close();
} else {
CompressionInputStream in =
codec.createInputStream(new java.io.FileInputStream(args[i]));
byte[] buffer = new byte[100];
int len = in.read(buffer);
while (len > 0) {
System.out.write(buffer, 0, len);
len = in.read(buffer);
}
in.close();
}
}
}
}
}
public XMLRecordReader(FileSplit split, JobConf jobConf) throws IOException {
if (jobConf.get(START_TAG_KEY) == null || jobConf.get(END_TAG_KEY) == null)
throw new RuntimeException("Error! XML start and end tags unspecified!");
startTag = jobConf.get(START_TAG_KEY).getBytes("utf-8");
endTag = jobConf.get(END_TAG_KEY).getBytes("utf-8");
start = split.getStart();
Path file = split.getPath();
CompressionCodecFactory compressionCodecs = new CompressionCodecFactory(jobConf);
CompressionCodec codec = compressionCodecs.getCodec(file);
FileSystem fs = file.getFileSystem(jobConf);
if (codec != null) {
sLogger.info("Reading compressed file...");
// InputStream tempStream = codec.createInputStream(fileIn);
// fsin = new DataInputStream(tempStream);
fsin = new DataInputStream(codec.createInputStream(fs.open(file)));
end = Long.MAX_VALUE;
} else {
sLogger.info("Reading uncompressed file...");
FSDataInputStream fileIn = fs.open(file);
fileIn.seek(start);
fsin = fileIn;
end = start + split.getLength();
}
recordStartPos = start;
// Because input streams of gzipped files are not seekable
// (specifically, do not support getPos), we need to keep
// track of bytes consumed ourselves.
pos = start;
}
public RecordReader<Text, Text> getRecordReader(
InputSplit genericSplit, JobConf job, Reporter reporter) throws IOException {
reporter.setStatus(genericSplit.toString());
FileSplit split = (FileSplit) genericSplit;
final Path file = split.getPath();
FileSystem fs = file.getFileSystem(job);
FSDataInputStream fileIn = fs.open(split.getPath());
if (compressionCodecs != null && compressionCodecs.getCodec(file) != null)
throw new RuntimeException("Not handling compression!");
return new StreamXmlRecordReader(fileIn, split, reporter, job, FileSystem.get(job));
}
@Override
public void initialize(InputSplit genericSplit, TaskAttemptContext context)
throws IOException, InterruptedException {
FileSplit split = (FileSplit) genericSplit;
start_ = split.getStart();
end_ = start_ + split.getLength();
final Path file = split.getPath();
Configuration job = HadoopCompat.getConfiguration(context);
errorTracker = new InputErrorTracker(job);
LOG.info("input split: " + file + " " + start_ + ":" + end_);
FileSystem fs = file.getFileSystem(job);
CompressionCodecFactory compressionCodecs = new CompressionCodecFactory(job);
final CompressionCodec codec = compressionCodecs.getCodec(file);
if (codec == null) {
throw new IOException("No codec for file " + file + " found, cannot run");
}
// Open the file and seek to the start of the split.
fileIn_ = fs.open(split.getPath());
// Creates input stream and also reads the file header.
createInputReader(codec.createInputStream(fileIn_), job);
if (start_ != 0) {
fileIn_.seek(start_);
skipToNextSyncPoint(false);
start_ = fileIn_.getPos();
LOG.info("Start is now " + start_);
} else {
skipToNextSyncPoint(true);
}
pos_ = start_;
}
public static void main(String[] args)
throws IOException, InterruptedException, ClassNotFoundException {
Path inputPath = new Path(args[0]);
Path outputDir = new Path(args[1]);
// Create configuration
Configuration conf = new Configuration(true);
// Create job
@SuppressWarnings("deprecation")
Job job = new Job(conf, "CountryIncomeConf");
job.setJarByClass(CountryIncomeConf.class);
// Decompressing .gz file Ex. foo.csv.gz to foo.csv
String uri = args[0];
FileSystem fs = FileSystem.get(URI.create(uri), conf);
CompressionCodecFactory factory = new CompressionCodecFactory(conf);
CompressionCodec codec = factory.getCodec(inputPath);
if (codec == null) {
System.err.println("No codec found for " + uri);
System.exit(1);
}
String outputUri = CompressionCodecFactory.removeSuffix(uri, codec.getDefaultExtension());
InputStream in = null;
OutputStream out = null;
try {
in = codec.createInputStream(fs.open(inputPath));
out = fs.create(new Path(outputUri));
IOUtils.copyBytes(in, out, conf);
} finally {
IOUtils.closeStream(in);
IOUtils.closeStream(out);
}
// Setup MapReduce
job.setMapperClass(CountryIncomeMapper.class);
job.setReducerClass(CountryIncomeReducer.class);
job.setNumReduceTasks(1);
// Specify key / value
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
// Input
// FileInputFormat.addInputPath(job, inputPath);
FileInputFormat.addInputPaths(job, outputUri);
job.setInputFormatClass(TextInputFormat.class);
// Output
FileOutputFormat.setOutputPath(job, outputDir);
job.setOutputFormatClass(TextOutputFormat.class);
// Delete output if exists
FileSystem hdfs = FileSystem.get(conf);
if (hdfs.exists(outputDir)) hdfs.delete(outputDir, true);
// Execute job
int code = job.waitForCompletion(true) ? 0 : 1;
// Counter finding and displaying
Counters counters = job.getCounters();
// Displaying counters
System.out.printf(
"Missing Fields: %d, Error Count: %d\n",
counters.findCounter(COUNTERS.MISSING_FIELDS_RECORD_COUNT).getValue(),
counters.findCounter(COUNTERS.NULL_OR_EMPTY).getValue());
System.exit(code);
}
public void runBenchmark() throws IOException {
System.out.println();
System.out.println();
System.out.println();
System.out.println();
/*
* org.apache.hadoop.io.compress.BZip2Codec,
* org.apache.hadoop.io.compress.DefaultCodec
* org.apache.hadoop.io.compress.DeflateCodec
* org.apache.hadoop.io.compress.GzipCodec
* org.apache.hadoop.io.compress.Lz4Codec
* org.apache.hadoop.io.compress.SnappyCodec
*/
Configuration conf = new Configuration();
List<Class<? extends CompressionCodec>> codecList = codecFactory.getCodecClasses(conf);
Set<Class<? extends CompressionCodec>> codecSet =
new HashSet<Class<? extends CompressionCodec>>();
codecSet.add(null); // no compression case
codecSet.addAll(codecList);
EnumSet<KV_TRAIT> traitSet = EnumSet.of(KV_TRAIT.KV, KV_TRAIT.MULTI_KV);
for (KV_TRAIT trait : traitSet) {
boolean rle = false;
for (Class<? extends CompressionCodec> codec : codecSet) {
try {
String fileName =
"result_"
+ trait
+ "_"
+ ((codec == null) ? "no_compression" : codec.getSimpleName())
+ "_no_rle.out";
CompressionCodec compCodec =
(codec == null) ? null : codecFactory.getCodecByClassName(codec.getName());
Path file = new Path(".", fileName);
WriterOptions writeOptions = new WriterOptions();
conf.set("ifile.trait", trait.toString());
writeOptions.setConf(conf).setFilePath(fs, file).setCodec(compCodec).setRLE(false);
createIFile(writeOptions, trait);
Result rs = new Result(fileName, writeOptions, fs.getFileStatus(file).getLen());
System.out.println(rs);
// with RLE
fileName =
"result_"
+ trait
+ "_"
+ ((codec == null) ? "no_compression" : codec.getSimpleName())
+ "_rle.out";
writeOptions.setRLE(true);
createIFile(writeOptions, trait);
rs = new Result(fileName, writeOptions, fs.getFileStatus(file).getLen());
System.out.println(rs);
} catch (Throwable t) {
t.printStackTrace();
// proceed to the next benchmark. Quite possible that codec jars aren't available
}
}
}
}
public static void testFinding() {
CompressionCodecFactory factory = new CompressionCodecFactory(new Configuration());
CompressionCodec codec = factory.getCodec(new Path("/tmp/foo.bar"));
assertEquals("default factory foo codec", null, codec);
codec = factory.getCodecByClassName(BarCodec.class.getCanonicalName());
assertEquals("default factory foo codec", null, codec);
codec = factory.getCodec(new Path("/tmp/foo.gz"));
checkCodec("default factory for .gz", GzipCodec.class, codec);
codec = factory.getCodecByClassName(GzipCodec.class.getCanonicalName());
checkCodec("default factory for gzip codec", GzipCodec.class, codec);
codec = factory.getCodecByName("gzip");
checkCodec("default factory for gzip codec", GzipCodec.class, codec);
codec = factory.getCodecByName("GZIP");
checkCodec("default factory for gzip codec", GzipCodec.class, codec);
codec = factory.getCodecByName("GZIPCodec");
checkCodec("default factory for gzip codec", GzipCodec.class, codec);
codec = factory.getCodecByName("gzipcodec");
checkCodec("default factory for gzip codec", GzipCodec.class, codec);
Class klass = factory.getCodecClassByName("gzipcodec");
assertEquals(GzipCodec.class, klass);
codec = factory.getCodec(new Path("/tmp/foo.bz2"));
checkCodec("default factory for .bz2", BZip2Codec.class, codec);
codec = factory.getCodecByClassName(BZip2Codec.class.getCanonicalName());
checkCodec("default factory for bzip2 codec", BZip2Codec.class, codec);
codec = factory.getCodecByName("bzip2");
checkCodec("default factory for bzip2 codec", BZip2Codec.class, codec);
codec = factory.getCodecByName("bzip2codec");
checkCodec("default factory for bzip2 codec", BZip2Codec.class, codec);
codec = factory.getCodecByName("BZIP2");
checkCodec("default factory for bzip2 codec", BZip2Codec.class, codec);
codec = factory.getCodecByName("BZIP2CODEC");
checkCodec("default factory for bzip2 codec", BZip2Codec.class, codec);
codec = factory.getCodecByClassName(DeflateCodec.class.getCanonicalName());
checkCodec("default factory for deflate codec", DeflateCodec.class, codec);
codec = factory.getCodecByName("deflate");
checkCodec("default factory for deflate codec", DeflateCodec.class, codec);
codec = factory.getCodecByName("deflatecodec");
checkCodec("default factory for deflate codec", DeflateCodec.class, codec);
codec = factory.getCodecByName("DEFLATE");
checkCodec("default factory for deflate codec", DeflateCodec.class, codec);
codec = factory.getCodecByName("DEFLATECODEC");
checkCodec("default factory for deflate codec", DeflateCodec.class, codec);
factory = setClasses(new Class[0]);
// gz, bz2, snappy, lz4 are picked up by service loader, but bar isn't
codec = factory.getCodec(new Path("/tmp/foo.bar"));
assertEquals("empty factory bar codec", null, codec);
codec = factory.getCodecByClassName(BarCodec.class.getCanonicalName());
assertEquals("empty factory bar codec", null, codec);
codec = factory.getCodec(new Path("/tmp/foo.gz"));
checkCodec("empty factory gz codec", GzipCodec.class, codec);
codec = factory.getCodecByClassName(GzipCodec.class.getCanonicalName());
checkCodec("empty factory gz codec", GzipCodec.class, codec);
codec = factory.getCodec(new Path("/tmp/foo.bz2"));
checkCodec("empty factory for .bz2", BZip2Codec.class, codec);
codec = factory.getCodecByClassName(BZip2Codec.class.getCanonicalName());
checkCodec("empty factory for bzip2 codec", BZip2Codec.class, codec);
codec = factory.getCodec(new Path("/tmp/foo.snappy"));
checkCodec("empty factory snappy codec", SnappyCodec.class, codec);
codec = factory.getCodecByClassName(SnappyCodec.class.getCanonicalName());
checkCodec("empty factory snappy codec", SnappyCodec.class, codec);
codec = factory.getCodec(new Path("/tmp/foo.lz4"));
checkCodec("empty factory lz4 codec", Lz4Codec.class, codec);
codec = factory.getCodecByClassName(Lz4Codec.class.getCanonicalName());
checkCodec("empty factory lz4 codec", Lz4Codec.class, codec);
factory = setClasses(new Class[] {BarCodec.class, FooCodec.class, FooBarCodec.class});
codec = factory.getCodec(new Path("/tmp/.foo.bar.gz"));
checkCodec("full factory gz codec", GzipCodec.class, codec);
codec = factory.getCodecByClassName(GzipCodec.class.getCanonicalName());
checkCodec("full codec gz codec", GzipCodec.class, codec);
codec = factory.getCodec(new Path("/tmp/foo.bz2"));
checkCodec("full factory for .bz2", BZip2Codec.class, codec);
codec = factory.getCodecByClassName(BZip2Codec.class.getCanonicalName());
checkCodec("full codec bzip2 codec", BZip2Codec.class, codec);
codec = factory.getCodec(new Path("/tmp/foo.bar"));
checkCodec("full factory bar codec", BarCodec.class, codec);
codec = factory.getCodecByClassName(BarCodec.class.getCanonicalName());
checkCodec("full factory bar codec", BarCodec.class, codec);
codec = factory.getCodecByName("bar");
checkCodec("full factory bar codec", BarCodec.class, codec);
codec = factory.getCodecByName("BAR");
checkCodec("full factory bar codec", BarCodec.class, codec);
codec = factory.getCodec(new Path("/tmp/foo/baz.foo.bar"));
checkCodec("full factory foo bar codec", FooBarCodec.class, codec);
codec = factory.getCodecByClassName(FooBarCodec.class.getCanonicalName());
checkCodec("full factory foo bar codec", FooBarCodec.class, codec);
codec = factory.getCodecByName("foobar");
checkCodec("full factory foo bar codec", FooBarCodec.class, codec);
codec = factory.getCodecByName("FOOBAR");
checkCodec("full factory foo bar codec", FooBarCodec.class, codec);
codec = factory.getCodec(new Path("/tmp/foo.foo"));
checkCodec("full factory foo codec", FooCodec.class, codec);
codec = factory.getCodecByClassName(FooCodec.class.getCanonicalName());
checkCodec("full factory foo codec", FooCodec.class, codec);
codec = factory.getCodecByName("foo");
checkCodec("full factory foo codec", FooCodec.class, codec);
codec = factory.getCodecByName("FOO");
checkCodec("full factory foo codec", FooCodec.class, codec);
factory = setClasses(new Class[] {NewGzipCodec.class});
codec = factory.getCodec(new Path("/tmp/foo.gz"));
checkCodec("overridden factory for .gz", NewGzipCodec.class, codec);
codec = factory.getCodecByClassName(NewGzipCodec.class.getCanonicalName());
checkCodec("overridden factory for gzip codec", NewGzipCodec.class, codec);
}
protected boolean isSplitable(FileSystem fs, Path file) {
if (compressionCodecs == null) return true;
return compressionCodecs.getCodec(file) == null;
}
/**
* Returns a factory for a given set of codecs
*
* @param classes the codec classes to include
* @return a new factory
*/
private static CompressionCodecFactory setClasses(Class[] classes) {
Configuration conf = new Configuration();
CompressionCodecFactory.setCodecClasses(conf, Arrays.asList(classes));
return new CompressionCodecFactory(conf);
}