1)Input处的数据压缩,需要在创建表的时候指定 2)map之后的数据压缩需要设置三个参数: hive.exec.compress.intermediate - true mapred.map.output.compress.codec – 选择编解码器 mapred.map.output.compress.codec - RECORD/BLOCK 3)reduce之后的数据压缩需要设置三个参数: hive.exec.compress.output - true map...
CompressionOutputStreamcreateOutputStream(OutputStream out, Compressor compressor)throwsIOException; Class<?extendsCompressor> getCompressorType(); CompressorcreateCompressor(); CompressionInputStreamcreateInputStream(InputStream in)throwsIOException; CompressionInputStreamcreateInputStream(InputStream in, Decompressor d...
CompressionCodecFactory factory = new CompressionCodecFactory(new Configuration()); CompressionCodec codec = factory.getCodec(new Path(filename)); CompressionInputStream fis = codec.createInputStream(new FileInputStream(new File(filename))); FileOutputStream fos = new FileOutputStream(new File(filena...
import org.apache.hadoop.io.compress.CompressionCodec; import org.apache.hadoop.io.compress.CompressionInputStream; import org.apache.hadoop.io.compress.CompressionOutputStream; import org.apache.hadoop.util.ReflectionUtils; import org.junit.Test; import java.io.*; import java.net.URI; import java.ne...
CompressionInputStream cis = codec.createInputStream(new FileInputStream(new File(filename))); // (2)获取输出流 FileOutputStream fos = new FileOutputStream(new File(filename + ".decoded")); // (3)流的对拷 IOUtils.copyBytes(cis, fos, 1024*1024*5, false); ...
packagecom.my.input;importjava.io.IOException;importorg.apache.hadoop.fs.Path;importorg.apache.hadoop.io.Text;importorg.apache.hadoop.io.compress.CompressionCodec;importorg.apache.hadoop.io.compress.CompressionCodecFactory;importorg.apache.hadoop.io.compress.SplittableCompressionCodec;importorg.apache.hadoop...
import org.apache.hadoop.io.compress.CompressionOutputStream;import org.apache.hadoop.util.Tool;import org.apache.hadoop.util.ToolRunner;public class WriteDemo_0010 extends Configured implements Tool{ @Override public int run(String[] args) throws Exception{ Configuration conf= getConf();String input=...
默认情况下,map的输出是不压缩的,但只要将mapred-site.xml文件的配置项mapred.compress.map.output设为true即可开启压缩功能。使用的压缩库由mapred-site.xml文件的配置项mapred.map.output.compression.codec。 指定,如下列出了Hadoop支持的常见压缩格式:
import org.apache.hadoop.io.compress.CompressionOutputStream; import org.apache.hadoop.util.Tool; import org.apache.hadoop.util.ToolRunner; public class WriteDemo_0010 extends Configured implements Tool{ @Override public int run(String[] args) throws Exception{ ...
(1)获取输入流 CompressionInputStream cis = codec.createInputStream(new FileInputStream(new File(filename))); // (2)获取输出流 FileOutputStream fos = new FileOutputStream(new File(filename + ".decoded")); // (3)流的对拷 IOUtils.copyBytes(cis, fos, 1024*1024*5, false); // (4)...