io.aos.hdfs.MapFileFixer.java Source code

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Here is the source code for io.aos.hdfs.MapFileFixer.java

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package io.aos.hdfs;

// cc MapFileFixer Re-creates the index for a MapFile
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.MapFile;
import org.apache.hadoop.io.SequenceFile;

// vv MapFileFixer
public class MapFileFixer {

    public static void main(String... args) throws Exception {
        String mapUri = args[0];

        Configuration conf = new Configuration();

        FileSystem fs = FileSystem.get(URI.create(mapUri), conf);
        Path map = new Path(mapUri);
        Path mapData = new Path(map, MapFile.DATA_FILE_NAME);

        // Get key and value types from data sequence file
        SequenceFile.Reader reader = new SequenceFile.Reader(fs, mapData, conf);
        Class keyClass = reader.getKeyClass();
        Class valueClass = reader.getValueClass();
        reader.close();

        // Create the map file index file
        long entries = MapFile.fix(fs, map, keyClass, valueClass, false, conf);
        System.out.printf("Created MapFile %s with %d entries\n", map, entries);
    }
}
// ^^ MapFileFixer