本文整理汇总了Java中org.apache.hadoop.mapred.IFileInputStream类的典型用法代码示例。如果您正苦于以下问题：Java IFileInputStream类的具体用法？Java IFileInputStream怎么用？Java IFileInputStream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。
IFileInputStream类属于org.apache.hadoop.mapred包，在下文中一共展示了IFileInputStream类的9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: doShuffle
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
@Override
protected void doShuffle(MapHost host, IFileInputStream iFin,
long compressedLength, long decompressedLength,
ShuffleClientMetrics metrics,
Reporter reporter) throws IOException {
InputStream input = iFin;
// Are map-outputs compressed?
if (codec != null) {
decompressor.reset();
input = codec.createInputStream(input, decompressor);
}
try {
IOUtils.readFully(input, memory, 0, memory.length);
metrics.inputBytes(memory.length);
reporter.progress();
LOG.info("Read " + memory.length + " bytes from map-output for " +
getMapId());
/**
* We've gotten the amount of data we were expecting. Verify the
* decompressor has nothing more to offer. This action also forces the
* decompressor to read any trailing bytes that weren't critical
* for decompression, which is necessary to keep the stream
* in sync.
*/
if (input.read() >= 0 ) {
throw new IOException("Unexpected extra bytes from input stream for " +
getMapId());
}
} finally {
CodecPool.returnDecompressor(decompressor);
}
}
示例2: shuffle
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
@Override
public void shuffle(MapHost host, InputStream input,
long compressedLength, long decompressedLength,
ShuffleClientMetrics metrics,
Reporter reporter) throws IOException {
doShuffle(host, new IFileInputStream(input, compressedLength, conf),
compressedLength, decompressedLength, metrics, reporter);
}
示例3: shuffleToMemory
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
private void shuffleToMemory(MapHost host, MapOutput<K,V> mapOutput,
InputStream input,
int decompressedLength,
int compressedLength) throws IOException {
IFileInputStream checksumIn =
new IFileInputStream(input, compressedLength);
input = checksumIn;
// Are map-outputs compressed?
if (codec != null) {
decompressor.reset();
input = codec.createInputStream(input, decompressor);
}
// Copy map-output into an in-memory buffer
byte[] shuffleData = mapOutput.getMemory();
try {
IOUtils.readFully(input, shuffleData, 0, shuffleData.length);
metrics.inputBytes(shuffleData.length);
reporter.progress();
LOG.info("Read " + shuffleData.length + " bytes from map-output for " +
mapOutput.getMapId());
} catch (IOException ioe) {
// Close the streams
IOUtils.cleanup(LOG, input);
// Re-throw
throw ioe;
}
}
示例4: shuffle
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
@Override
public void shuffle(MapHost host, InputStream input,
long compressedLength, long decompressedLength,
ShuffleClientMetrics metrics,
Reporter reporter) throws IOException {
IFileInputStream checksumIn =
new IFileInputStream(input, compressedLength, conf);
input = checksumIn;
// Are map-outputs compressed?
if (codec != null) {
decompressor.reset();
input = codec.createInputStream(input, decompressor);
}
try {
IOUtils.readFully(input, memory, 0, memory.length);
metrics.inputBytes(memory.length);
reporter.progress();
LOG.info("Read " + memory.length + " bytes from map-output for " +
getMapId());
/**
* We've gotten the amount of data we were expecting. Verify the
* decompressor has nothing more to offer. This action also forces the
* decompressor to read any trailing bytes that weren't critical
* for decompression, which is necessary to keep the stream
* in sync.
*/
if (input.read() >= 0 ) {
throw new IOException("Unexpected extra bytes from input stream for " +
getMapId());
}
} catch (IOException ioe) {
// Close the streams
IOUtils.cleanup(LOG, input);
// Re-throw
throw ioe;
} finally {
CodecPool.returnDecompressor(decompressor);
}
}
示例5: doShuffle
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
@Override
protected void doShuffle(MapHost host, IFileInputStream input,
long compressedLength, long decompressedLength,
ShuffleClientMetrics metrics,
Reporter reporter) throws IOException {
// Copy data to local-disk
long bytesLeft = compressedLength;
try {
final int BYTES_TO_READ = 64 * 1024;
byte[] buf = new byte[BYTES_TO_READ];
while (bytesLeft > 0) {
int n = input.readWithChecksum(buf, 0,
(int) Math.min(bytesLeft, BYTES_TO_READ));
if (n < 0) {
throw new IOException("read past end of stream reading " +
getMapId());
}
disk.write(buf, 0, n);
bytesLeft -= n;
metrics.inputBytes(n);
reporter.progress();
}
LOG.info("Read " + (compressedLength - bytesLeft) +
" bytes from map-output for " + getMapId());
disk.close();
} catch (IOException ioe) {
// Close the streams
IOUtils.cleanup(LOG, disk);
// Re-throw
throw ioe;
}
// Sanity check
if (bytesLeft != 0) {
throw new IOException("Incomplete map output received for " +
getMapId() + " from " +
host.getHostName() + " (" +
bytesLeft + " bytes missing of " +
compressedLength + ")");
}
this.compressedSize = compressedLength;
}
示例6: doShuffle
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
protected abstract void doShuffle(
MapHost host, IFileInputStream iFileInputStream,
long compressedLength, long decompressedLength,
ShuffleClientMetrics metrics, Reporter reporter) throws IOException;
示例7: testCorruptedIFile
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
@Test
public void testCorruptedIFile() throws Exception {
final int fetcher = 7;
Path onDiskMapOutputPath = new Path(name.getMethodName() + "/foo");
Path shuffledToDisk =
OnDiskMapOutput.getTempPath(onDiskMapOutputPath, fetcher);
fs = FileSystem.getLocal(job).getRaw();
IFileWrappedMapOutput<Text,Text> odmo =
new OnDiskMapOutput<Text,Text>(map1ID, mm, 100L, job, fetcher, true,
fs, onDiskMapOutputPath);
String mapData = "MAPDATA12345678901234567890";
ShuffleHeader header = new ShuffleHeader(map1ID.toString(), 14, 10, 1);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bout);
IFileOutputStream ios = new IFileOutputStream(dos);
header.write(dos);
int headerSize = dos.size();
try {
ios.write(mapData.getBytes());
} finally {
ios.close();
}
int dataSize = bout.size() - headerSize;
// Ensure that the OnDiskMapOutput shuffler can successfully read the data.
MapHost host = new MapHost("TestHost", "http://test/url");
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
try {
// Read past the shuffle header.
bin.read(new byte[headerSize], 0, headerSize);
odmo.shuffle(host, bin, dataSize, dataSize, metrics, Reporter.NULL);
} finally {
bin.close();
}
// Now corrupt the IFile data.
byte[] corrupted = bout.toByteArray();
corrupted[headerSize + (dataSize / 2)] = 0x0;
try {
bin = new ByteArrayInputStream(corrupted);
// Read past the shuffle header.
bin.read(new byte[headerSize], 0, headerSize);
odmo.shuffle(host, bin, dataSize, dataSize, metrics, Reporter.NULL);
fail("OnDiskMapOutput.shuffle didn't detect the corrupted map partition file");
} catch(ChecksumException e) {
LOG.info("The expected checksum exception was thrown.", e);
} finally {
bin.close();
}
// Ensure that the shuffled file can be read.
IFileInputStream iFin = new IFileInputStream(fs.open(shuffledToDisk), dataSize, job);
try {
iFin.read(new byte[dataSize], 0, dataSize);
} finally {
iFin.close();
}
}
示例8: testCorruptedIFile
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
@Test
public void testCorruptedIFile() throws Exception {
final int fetcher = 7;
Path onDiskMapOutputPath = new Path(name.getMethodName() + "/foo");
Path shuffledToDisk =
OnDiskMapOutput.getTempPath(onDiskMapOutputPath, fetcher);
fs = FileSystem.getLocal(job).getRaw();
MapOutputFile mof = mock(MapOutputFile.class);
OnDiskMapOutput<Text,Text> odmo = new OnDiskMapOutput<Text,Text>(map1ID,
id, mm, 100L, job, mof, fetcher, true, fs, onDiskMapOutputPath);
String mapData = "MAPDATA12345678901234567890";
ShuffleHeader header = new ShuffleHeader(map1ID.toString(), 14, 10, 1);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bout);
IFileOutputStream ios = new IFileOutputStream(dos);
header.write(dos);
int headerSize = dos.size();
try {
ios.write(mapData.getBytes());
} finally {
ios.close();
}
int dataSize = bout.size() - headerSize;
// Ensure that the OnDiskMapOutput shuffler can successfully read the data.
MapHost host = new MapHost("TestHost", "http://test/url");
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
try {
// Read past the shuffle header.
bin.read(new byte[headerSize], 0, headerSize);
odmo.shuffle(host, bin, dataSize, dataSize, metrics, Reporter.NULL);
} finally {
bin.close();
}
// Now corrupt the IFile data.
byte[] corrupted = bout.toByteArray();
corrupted[headerSize + (dataSize / 2)] = 0x0;
try {
bin = new ByteArrayInputStream(corrupted);
// Read past the shuffle header.
bin.read(new byte[headerSize], 0, headerSize);
odmo.shuffle(host, bin, dataSize, dataSize, metrics, Reporter.NULL);
fail("OnDiskMapOutput.shuffle didn't detect the corrupted map partition file");
} catch(ChecksumException e) {
LOG.info("The expected checksum exception was thrown.", e);
} finally {
bin.close();
}
// Ensure that the shuffled file can be read.
IFileInputStream iFin = new IFileInputStream(fs.open(shuffledToDisk), dataSize, job);
try {
iFin.read(new byte[dataSize], 0, dataSize);
} finally {
iFin.close();
}
}
示例9: shuffle
import org.apache.hadoop.mapred.IFileInputStream; //导入依赖的package包/类
@Override
public void shuffle(MapHost host, InputStream input, long compressedLength,
long decompressedLength, ShuffleClientMetrics metrics,
Reporter reporter) throws IOException {
String mapHostName = host.getHostName().split(":")[0];
String app_path = conf.get(MRConfig.LOCAL_DIR);
LOG.debug("original app_path " + app_path);
String[] app_path_parts = app_path.split("/");
app_path_parts[app_path_parts.length-5] = mapHostName;
StringBuilder builder = new StringBuilder();
for(String s : app_path_parts) {
builder.append(s);
builder.append("/");
}
app_path = builder.toString();
String src = app_path + "output/" + getMapId() + "/file.out";
File f = new File(src);
if (f.exists()) {
LOG.debug("shuffleToLink: the src " + src + " EXIST!");
}
//LOG.debug("src file size: "+f.length());
//input = new FileInputStream(src);
//input.skip(offset);
RandomAccessFile raf = new RandomAccessFile(f, "r");
input = Channels.newInputStream(raf.getChannel().position(offset));
IFileInputStream checksumIn = new IFileInputStream(input,
compressedLength, conf);
input = checksumIn;
// Are map-outputs compressed?
if (codec != null) {
decompressor.reset();
input = codec.createInputStream(input, decompressor);
}
try {
LOG.debug("offset: " + offset);
LOG.debug("memory.length: " + memory.length);
LOG.debug("compressedLength: " + compressedLength);
LOG.debug("decompressedLength: " + decompressedLength);
// TO-DO: would offset and length be OK to be int?
IOUtils.readFully(input, memory, 0, memory.length);
metrics.inputBytes((int) memory.length);
reporter.progress();
LOG.info("Read " + memory.length + " bytes from map-output for "
+ getMapId());
/**
* We've gotten the amount of data we were expecting. Verify the
* decompressor has nothing more to offer. This action also forces
* the decompressor to read any trailing bytes that weren't critical
* for decompression, which is necessary to keep the stream in sync.
*/
//if (input.read() >= 0) {
// throw new IOException(
// "Unexpected extra bytes from input stream for "
// + getMapId());
//}
input.close();
raf.close();
} catch (IOException ioe) {
// Close the streams
IOUtils.cleanup(LOG, input);
// Re-throw
throw ioe;
} finally {
CodecPool.returnDecompressor(decompressor);
}
}