本文整理汇总了Java中org.apache.hadoop.io.RandomDatum类的典型用法代码示例。如果您正苦于以下问题：Java RandomDatum类的具体用法？Java RandomDatum怎么用？Java RandomDatum使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
RandomDatum类属于org.apache.hadoop.io包，在下文中一共展示了RandomDatum类的5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: setUp
import org.apache.hadoop.io.RandomDatum; //导入依赖的package包/类
@Before
public void setUp() throws IOException {
// Generate data
final int seed = new Random().nextInt();
final DataOutputBuffer dataBuf = new DataOutputBuffer();
final RandomDatum.Generator generator = new RandomDatum.Generator(seed);
for(int i = 0; i < count; ++i) {
generator.next();
final RandomDatum key = generator.getKey();
final RandomDatum value = generator.getValue();
key.write(dataBuf);
value.write(dataBuf);
}
LOG.info("Generated " + count + " records");
data = dataBuf.getData();
dataLen = dataBuf.getLength();
}
示例2: testSequenceFileSync
import org.apache.hadoop.io.RandomDatum; //导入依赖的package包/类
/** Test hsync via SequenceFiles */
@Test
public void testSequenceFileSync() throws Exception {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
final FileSystem fs = cluster.getFileSystem();
final Path p = new Path("/testSequenceFileSync/foo");
final int len = 1 << 16;
FSDataOutputStream out = fs.create(p, FsPermission.getDefault(),
EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE, CreateFlag.SYNC_BLOCK),
4096, (short) 1, len, null);
Writer w = SequenceFile.createWriter(new Configuration(),
Writer.stream(out),
Writer.keyClass(RandomDatum.class),
Writer.valueClass(RandomDatum.class),
Writer.compression(CompressionType.NONE, new DefaultCodec()));
w.hflush();
checkSyncMetric(cluster, 0);
w.hsync();
checkSyncMetric(cluster, 1);
int seed = new Random().nextInt();
RandomDatum.Generator generator = new RandomDatum.Generator(seed);
generator.next();
w.append(generator.getKey(), generator.getValue());
w.hsync();
checkSyncMetric(cluster, 2);
w.close();
checkSyncMetric(cluster, 2);
out.close();
checkSyncMetric(cluster, 3);
cluster.shutdown();
}
示例3: testSequenceFileSync
import org.apache.hadoop.io.RandomDatum; //导入依赖的package包/类
/**
* Test hsync via SequenceFiles
*/
@Test
public void testSequenceFileSync() throws Exception {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
final FileSystem fs = cluster.getFileSystem();
final Path p = new Path("/testSequenceFileSync/foo");
final int len = 1 << 16;
FSDataOutputStream out = fs.create(p, FsPermission.getDefault(), EnumSet
.of(CreateFlag.CREATE, CreateFlag.OVERWRITE, CreateFlag.SYNC_BLOCK),
4096, (short) 1, len, null);
Writer w = SequenceFile
.createWriter(new Configuration(), Writer.stream(out),
Writer.keyClass(RandomDatum.class),
Writer.valueClass(RandomDatum.class),
Writer.compression(CompressionType.NONE, new DefaultCodec()));
w.hflush();
checkSyncMetric(cluster, 0);
w.hsync();
checkSyncMetric(cluster, 1);
int seed = new Random().nextInt();
RandomDatum.Generator generator = new RandomDatum.Generator(seed);
generator.next();
w.append(generator.getKey(), generator.getValue());
w.hsync();
checkSyncMetric(cluster, 2);
w.close();
checkSyncMetric(cluster, 2);
out.close();
checkSyncMetric(cluster, 3);
cluster.shutdown();
}
示例4: codecTest
import org.apache.hadoop.io.RandomDatum; //导入依赖的package包/类
private static void codecTest(Configuration conf, int seed, int count,
String codecClass)
throws IOException {
// Create the codec
CompressionCodec codec = null;
try {
codec = (CompressionCodec)
ReflectionUtils.newInstance(conf.getClassByName(codecClass), conf);
} catch (ClassNotFoundException cnfe) {
throw new IOException("Illegal codec!");
}
LOG.info("Created a Codec object of type: " + codecClass);
// Generate data
DataOutputBuffer data = new DataOutputBuffer();
RandomDatum.Generator generator = new RandomDatum.Generator(seed);
for(int i=0; i < count; ++i) {
generator.next();
RandomDatum key = generator.getKey();
RandomDatum value = generator.getValue();
key.write(data);
value.write(data);
}
DataInputBuffer originalData = new DataInputBuffer();
DataInputStream originalIn = new DataInputStream(new BufferedInputStream(originalData));
originalData.reset(data.getData(), 0, data.getLength());
LOG.info("Generated " + count + " records");
// Compress data
DataOutputBuffer compressedDataBuffer = new DataOutputBuffer();
CompressionOutputStream deflateFilter =
codec.createOutputStream(compressedDataBuffer);
DataOutputStream deflateOut =
new DataOutputStream(new BufferedOutputStream(deflateFilter));
deflateOut.write(data.getData(), 0, data.getLength());
deflateOut.flush();
deflateFilter.finish();
LOG.info("Finished compressing data");
// De-compress data
DataInputBuffer deCompressedDataBuffer = new DataInputBuffer();
deCompressedDataBuffer.reset(compressedDataBuffer.getData(), 0,
compressedDataBuffer.getLength());
CompressionInputStream inflateFilter =
codec.createInputStream(deCompressedDataBuffer);
DataInputStream inflateIn =
new DataInputStream(new BufferedInputStream(inflateFilter));
// Check
for(int i=0; i < count; ++i) {
RandomDatum k1 = new RandomDatum();
RandomDatum v1 = new RandomDatum();
k1.readFields(originalIn);
v1.readFields(originalIn);
RandomDatum k2 = new RandomDatum();
RandomDatum v2 = new RandomDatum();
k2.readFields(inflateIn);
v2.readFields(inflateIn);
}
LOG.info("SUCCESS! Completed checking " + count + " records");
}
示例5: codecTest
import org.apache.hadoop.io.RandomDatum; //导入依赖的package包/类
private static void codecTest(Configuration conf, int seed, int count,
String codecClass)
throws IOException {
// Create the codec
CompressionCodec codec = null;
try {
codec = (CompressionCodec)
ReflectionUtils.newInstance(conf.getClassByName(codecClass), conf);
} catch (ClassNotFoundException cnfe) {
throw new IOException("Illegal codec!");
}
LOG.info("Created a Codec object of type: " + codecClass);
// Generate data
DataOutputBuffer data = new DataOutputBuffer();
RandomDatum.Generator generator = new RandomDatum.Generator(seed);
for(int i=0; i < count; ++i) {
generator.next();
RandomDatum key = generator.getKey();
RandomDatum value = generator.getValue();
key.write(data);
value.write(data);
}
DataInputBuffer originalData = new DataInputBuffer();
DataInputStream originalIn = new DataInputStream(new BufferedInputStream(originalData));
originalData.reset(data.getData(), 0, data.getLength());
LOG.info("Generated " + count + " records");
// Compress data
DataOutputBuffer compressedDataBuffer = new DataOutputBuffer();
CompressionOutputStream deflateFilter =
codec.createOutputStream(compressedDataBuffer);
DataOutputStream deflateOut =
new DataOutputStream(new BufferedOutputStream(deflateFilter));
deflateOut.write(data.getData(), 0, data.getLength());
deflateOut.flush();
deflateFilter.finish();
LOG.info("Finished compressing data");
// De-compress data
DataInputBuffer deCompressedDataBuffer = new DataInputBuffer();
deCompressedDataBuffer.reset(compressedDataBuffer.getData(), 0,
compressedDataBuffer.getLength());
CompressionInputStream inflateFilter =
codec.createInputStream(deCompressedDataBuffer);
DataInputStream inflateIn =
new DataInputStream(new BufferedInputStream(inflateFilter));
// Check
for(int i=0; i < count; ++i) {
RandomDatum k1 = new RandomDatum();
RandomDatum v1 = new RandomDatum();
k1.readFields(originalIn);
v1.readFields(originalIn);
RandomDatum k2 = new RandomDatum();
RandomDatum v2 = new RandomDatum();
k2.readFields(inflateIn);
v2.readFields(inflateIn);
assertTrue("original and compressed-then-decompressed-output not equal",
k1.equals(k2) && v1.equals(v2));
}
LOG.info("SUCCESS! Completed checking " + count + " records");
}