Example usage for org.apache.hadoop.io.compress CompressionCodec createInputStream

Introduction

In this page you can find the example usage for org.apache.hadoop.io.compress CompressionCodec createInputStream.

Prototype

CompressionInputStream createInputStream(InputStream in) throws IOException;

Source Link

Document

Create a CompressionInputStream that will read from the given input stream.

Usage

From source file:StorageEngineClient.MyLineRecordReader.java

License:Open Source License

public MyLineRecordReader(Configuration job, FileSplit split) throws IOException {
    this.maxLineLength = job.getInt("mapred.linerecordreader.maxlength", Integer.MAX_VALUE);
    start = split.getStart();/*w w w . j av  a  2 s.c om*/
    end = start + split.getLength();
    final Path file = split.getPath();
    compressionCodecs = new CompressionCodecFactory(job);
    final CompressionCodec codec = compressionCodecs.getCodec(file);

    this.tempConf = job;
    this.tempSplit = split;

    FileSystem fs = file.getFileSystem(job);
    FSDataInputStream fileIn = fs.open(split.getPath());
    boolean skipFirstLine = false;
    if (codec != null) {
        in = new LineReader(codec.createInputStream(fileIn), job);
        end = Long.MAX_VALUE;
    } else {
        if (start != 0) {
            skipFirstLine = true;
            --start;
            fileIn.seek(start);
        }
        in = new LineReader(fileIn, job);
    }
    if (skipFirstLine) {
        start += in.readLine(new Text(), 0, (int) Math.min((long) Integer.MAX_VALUE, end - start));
    }
    this.pos = start;
}

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From source file:trec.MyLineRecordReader.java

License:Apache License

public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException {
    FileSplit split = (FileSplit) genericSplit;
    Configuration job = context.getConfiguration();
    this.maxLineLength = job.getInt("mapred.linerecordreader.maxlength", Integer.MAX_VALUE);
    start = split.getStart();/*from w  w w.j a  v a2 s.  c  o m*/
    end = start + split.getLength();
    final Path file = split.getPath();
    compressionCodecs = new CompressionCodecFactory(job);
    final CompressionCodec codec = compressionCodecs.getCodec(file);

    // open the file and seek to the start of the split
    FileSystem fs = file.getFileSystem(job);
    FSDataInputStream fileIn = fs.open(split.getPath());
    boolean skipFirstLine = false;
    if (codec != null) {
        in = new MyLineReader(codec.createInputStream(fileIn), job);
        end = Long.MAX_VALUE;
    } else {
        if (start != 0) {
            skipFirstLine = true;
            --start;
            fileIn.seek(start);
        }
        in = new MyLineReader(fileIn, job);
    }
    if (skipFirstLine) { // skip first line and re-establish "start".
        start += in.readLine(new Text(), 0, (int) Math.min((long) Integer.MAX_VALUE, end - start));
    }
    this.pos = start;
}

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From source file:trec.PRRecordReader.java

License:Apache License

public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException {
    FileSplit split = (FileSplit) genericSplit;
    Configuration job = context.getConfiguration();
    this.maxLineLength = job.getInt("mapred.linerecordreader.maxlength", Integer.MAX_VALUE);
    start = split.getStart();/*from  w  w w .  j a  v  a2s .  com*/
    end = start + split.getLength();
    final Path file = split.getPath();
    compressionCodecs = new CompressionCodecFactory(job);
    final CompressionCodec codec = compressionCodecs.getCodec(file);

    // open the file and seek to the start of the split
    FileSystem fs = file.getFileSystem(job);
    FSDataInputStream fileIn = fs.open(split.getPath());
    boolean skipFirstLine = false;
    if (codec != null) {
        in = new LineReader(codec.createInputStream(fileIn), job);
        end = Long.MAX_VALUE;
    } else {
        if (start != 0) {
            skipFirstLine = true;
            --start;
            fileIn.seek(start);
        }
        in = new LineReader(fileIn, job);
    }
    if (skipFirstLine) { // skip first line and re-establish "start".
        start += in.readLine(new Text(), 0, (int) Math.min((long) Integer.MAX_VALUE, end - start));
    }
    this.pos = start;
}

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From source file:trec.TrecRecordReader.java

License:Apache License

public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException {
    FileSplit split = (FileSplit) genericSplit;
    Configuration job = context.getConfiguration();
    start = split.getStart();/*w  ww.  j ava 2s . co  m*/
    end = start + split.getLength();
    final Path file = split.getPath();
    compressionCodecs = new CompressionCodecFactory(job);
    final CompressionCodec codec = compressionCodecs.getCodec(file);

    // open the file and seek to the start of the split
    FileSystem fs = file.getFileSystem(job);
    FSDataInputStream fileIn = fs.open(split.getPath());
    boolean skipFirstLine = false;
    if (codec != null) {
        in = new LineReader(codec.createInputStream(fileIn), job);
        end = Long.MAX_VALUE;
    } else {
        if (start != 0) {
            skipFirstLine = true;
            --start;
            fileIn.seek(start);
        }
        in = new LineReader(fileIn, job);
    }
    if (skipFirstLine) { // skip first line and re-establish "start".
        start += in.readLine(new Text(), 0, (int) Math.min((long) Integer.MAX_VALUE, end - start));
    }
    this.pos = start;
}

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From source file:uk.bl.wa.hadoop.mapred.ByteBlockRecordReader.java

License:Open Source License

/**
 * //from   www .java 2s. c  o m
 * @param inputSplit
 * @param conf
 * @throws IOException
 */
public ByteBlockRecordReader(InputSplit inputSplit, JobConf conf) throws IOException {
    if (inputSplit instanceof FileSplit) {
        FileSplit fs = (FileSplit) inputSplit;
        path = fs.getPath();
        FileSystem fSys = path.getFileSystem(conf);
        file_length = fSys.getContentSummary(path).getLength();
        fsdis = fSys.open(path);

        // Support auto-decompression of compressed files:
        boolean autoDecompress = conf.getBoolean("mapreduce.unsplittableinputfileformat.autodecompress", false);
        if (autoDecompress) {
            log.warn("Enabling auto-decompression of this file.");
            compressionCodecs = new CompressionCodecFactory(conf);
            final CompressionCodec codec = compressionCodecs.getCodec(path);
            if (codec != null) {
                fsdis = codec.createInputStream(fsdis);
            }
        } else {
            log.info("Auto-decompression is not enabled.");
        }
    } else {
        log.error("Only FileSplit supported!");
        throw new IOException("Need FileSplit input...");
    }
}

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