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August 16, 2021 06:09
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import java.io.IOException; | |
import java.net.URI; | |
import org.apache.hadoop.conf.Configuration; | |
import org.apache.hadoop.fs.FileSystem; | |
import org.apache.hadoop.fs.Path; | |
import org.apache.hadoop.io.IOUtils; | |
import org.apache.hadoop.io.IntWritable; | |
import org.apache.hadoop.io.SequenceFile; | |
import org.apache.hadoop.io.Text; | |
//White, Tom (2012-05-10). Hadoop: The Definitive Guide (Kindle Locations 5375-5384). OReilly Media - A. Kindle Edition. | |
public class SequenceFileWriteDemo { | |
private static final String[] DATA = { "One, two, buckle my shoe", "Three, four, shut the door", "Five, six, pick up sticks", "Seven, eight, lay them straight", "Nine, ten, a big fat hen" }; | |
public static void main( String[] args) throws IOException { | |
String uri = args[ 0]; | |
Configuration conf = new Configuration(); | |
FileSystem fs = FileSystem.get(URI.create( uri), conf); | |
Path path = new Path( uri); | |
IntWritable key = new IntWritable(); | |
Text value = new Text(); | |
SequenceFile.Writer writer = null; | |
try { | |
writer = SequenceFile.createWriter( fs, conf, path, key.getClass(), value.getClass()); | |
for (int i = 0; i < 100; i ++) { | |
key.set( 100 - i); | |
value.set( DATA[ i % DATA.length]); | |
System.out.printf("[% s]\t% s\t% s\n", writer.getLength(), key, value); | |
writer.append( key, value); } | |
} finally | |
{ IOUtils.closeStream( writer); | |
} | |
} | |
} |
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