Example usage for org.apache.hadoop.mapreduce.lib.input FileSplit getStart

Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce.lib.input FileSplit getStart.

Prototype

public long getStart() 

Source Link

Document

The position of the first byte in the file to process.

Usage

From source file:BamRecordReader.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();
    split_length = split.getLength();/*from w  w  w.  j a v  a2  s.c  o m*/
    System.out.println("start: " + start);
    System.out.println("split_length: " + split_length);
    fileInfo = split.getPath();
    //String fileName = fileInfo.toString().split("-")[0];
    //Path file = new Path(fileName);
    //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);
    //fileIn = fs.open(file);
    //fileIn.seek(start);
    //this.pos = start;
}

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From source file:authordetect.input.SingleBookReader.java

/**
 * @param inputSplit//from  w  w  w  .  java2  s .co  m
 * @param context    the information about the task
 * @throws java.io.IOException
 * @throws InterruptedException
 */
@Override
public void initialize(InputSplit inputSplit, TaskAttemptContext context)
        throws IOException, InterruptedException {

    FileSplit split = (FileSplit) inputSplit;
    Configuration configuration = context.getConfiguration();

    // get the option from configuration:
    // 0 for group by author, 1 for group by book
    int option = configuration.getInt("GROUP_OPTION", 0);

    Path path = split.getPath();
    filename = path.getName();
    FileSystem fileSystem = path.getFileSystem(configuration);
    FSDataInputStream inputStream = fileSystem.open(path);
    lineReader = new LineReader(inputStream, configuration);

    //initial start point and end point
    start = split.getStart();
    end = start + split.getLength();

    inputStream.seek(start);
    if (start != 0) {
        start += lineReader.readLine(new Text(), 0, (int) Math.min(Integer.MAX_VALUE, end - start));
    }

    start += lineReader.readLine(currentLine);

    prepareToScanBook(option);
}

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From source file:brush.FastqRecordReader.java

License:Apache License

/**
 * Builds a new record reader given a config file and an input split.
 *
 * @param conf The Hadoop configuration object. Used for gaining access
 *   to the underlying file system./*from   w  ww .  j a v a2  s . c o  m*/
 * @param split The file split to read.
 */
protected FastqRecordReader(final Configuration conf, final FileSplit split) throws IOException {
    file = split.getPath();
    start = split.getStart();
    end = start + split.getLength();

    FileSystem fs = file.getFileSystem(conf);
    FSDataInputStream fileIn = fs.open(file);

    CompressionCodecFactory codecFactory = new CompressionCodecFactory(conf);
    CompressionCodec codec = codecFactory.getCodec(file);

    if (codec == null) { // no codec.  Uncompressed file.
        positionAtFirstRecord(fileIn);
        inputStream = fileIn;
    } else {
        // compressed file
        if (start != 0) {
            throw new RuntimeException("Start position for compressed file is not 0! (found " + start + ")");
        }

        inputStream = codec.createInputStream(fileIn);
        end = Long.MAX_VALUE; // read until the end of the file
    }

    lineReader = new LineReader(inputStream);
}

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From source file:ca.sparkera.adapters.mapreduce.MainframeVBRecordReader.java

License:Apache License

@Override
public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException {
    FileSplit split = (FileSplit) genericSplit;
    Configuration job = context.getConfiguration();
    final Path file = split.getPath();
    initialize(job, split.getStart(), split.getLength(), file);
}

---

From source file:cn.uc.hadoop.mapreduce.lib.input.FileNameLineRecordReader.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(MAX_LINE_LENGTH, Integer.MAX_VALUE);
    start = split.getStart();
    end = start + split.getLength();/*  www.j  a va2  s  .  co m*/
    final Path file = split.getPath();
    //ADD by qiujw key??
    key = new Text(file.getName());

    compressionCodecs = new CompressionCodecFactory(job);
    codec = compressionCodecs.getCodec(file);

    // open the file and seek to the start of the split
    final FileSystem fs = file.getFileSystem(job);
    fileIn = fs.open(file);
    if (isCompressedInput()) {
        decompressor = CodecPool.getDecompressor(codec);
        if (codec instanceof SplittableCompressionCodec) {
            final SplitCompressionInputStream cIn = ((SplittableCompressionCodec) codec).createInputStream(
                    fileIn, decompressor, start, end, SplittableCompressionCodec.READ_MODE.BYBLOCK);
            if (null == this.recordDelimiterBytes) {
                in = new LineReader(cIn, job);
            } else {
                in = new LineReader(cIn, job, this.recordDelimiterBytes);
            }

            start = cIn.getAdjustedStart();
            end = cIn.getAdjustedEnd();
            filePosition = cIn;
        } else {
            if (null == this.recordDelimiterBytes) {
                in = new LineReader(codec.createInputStream(fileIn, decompressor), job);
            } else {
                in = new LineReader(codec.createInputStream(fileIn, decompressor), job,
                        this.recordDelimiterBytes);
            }
            filePosition = fileIn;
        }
    } else {
        fileIn.seek(start);
        if (null == this.recordDelimiterBytes) {
            in = new LineReader(fileIn, job);
        } else {
            in = new LineReader(fileIn, job, this.recordDelimiterBytes);
        }

        filePosition = fileIn;
    }
    // If this is not the first split, we always throw away first record
    // because we always (except the last split) read one extra line in
    // next() method.
    if (start != 0) {
        start += in.readLine(new Text(), 0, maxBytesToConsume(start));
    }
    this.pos = start;
}

---

From source file:cn.uc.hadoop.mapreduce.lib.input.FilePathLineRecordReader.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(MAX_LINE_LENGTH, Integer.MAX_VALUE);
    start = split.getStart();
    end = start + split.getLength();// w  ww . j  a  v a 2  s .  co  m
    final Path file = split.getPath();
    //ADD by qiujw key?
    key = new Text(file.toString());

    compressionCodecs = new CompressionCodecFactory(job);
    codec = compressionCodecs.getCodec(file);

    // open the file and seek to the start of the split
    final FileSystem fs = file.getFileSystem(job);
    fileIn = fs.open(file);
    if (isCompressedInput()) {
        decompressor = CodecPool.getDecompressor(codec);
        if (codec instanceof SplittableCompressionCodec) {
            final SplitCompressionInputStream cIn = ((SplittableCompressionCodec) codec).createInputStream(
                    fileIn, decompressor, start, end, SplittableCompressionCodec.READ_MODE.BYBLOCK);
            if (null == this.recordDelimiterBytes) {
                in = new LineReader(cIn, job);
            } else {
                in = new LineReader(cIn, job, this.recordDelimiterBytes);
            }

            start = cIn.getAdjustedStart();
            end = cIn.getAdjustedEnd();
            filePosition = cIn;
        } else {
            if (null == this.recordDelimiterBytes) {
                in = new LineReader(codec.createInputStream(fileIn, decompressor), job);
            } else {
                in = new LineReader(codec.createInputStream(fileIn, decompressor), job,
                        this.recordDelimiterBytes);
            }
            filePosition = fileIn;
        }
    } else {
        fileIn.seek(start);
        if (null == this.recordDelimiterBytes) {
            in = new LineReader(fileIn, job);
        } else {
            in = new LineReader(fileIn, job, this.recordDelimiterBytes);
        }

        filePosition = fileIn;
    }
    // If this is not the first split, we always throw away first record
    // because we always (except the last split) read one extra line in
    // next() method.
    if (start != 0) {
        start += in.readLine(new Text(), 0, maxBytesToConsume(start));
    }
    this.pos = start;
}

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From source file:co.cask.hydrator.plugin.batch.CopybookRecordReader.java

License:Apache License

@Override
public void initialize(InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {
    // Get configuration
    Configuration conf = context.getConfiguration();
    int fileStructure = net.sf.JRecord.Common.Constants.IO_FIXED_LENGTH;
    Path path = new Path(conf.get(CopybookInputFormat.COPYBOOK_INPUTFORMAT_DATA_HDFS_PATH));
    FileSystem fs = FileSystem.get(path.toUri(), conf);
    // Create input stream for the COBOL copybook contents
    InputStream inputStream = IOUtils
            .toInputStream(conf.get(CopybookInputFormat.COPYBOOK_INPUTFORMAT_CBL_CONTENTS), "UTF-8");
    BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
    try {/*w  w w .  j a v  a 2  s.c  o  m*/
        externalRecord = CopybookIOUtils.getExternalRecord(bufferedInputStream);
        recordByteLength = CopybookIOUtils.getRecordLength(externalRecord, fileStructure);

        LineProvider lineProvider = LineIOProvider.getInstance().getLineProvider(fileStructure,
                CopybookIOUtils.FONT);
        reader = LineIOProvider.getInstance().getLineReader(fileStructure, lineProvider);
        LayoutDetail copybook = CopybookIOUtils.getLayoutDetail(externalRecord);

        org.apache.hadoop.mapreduce.lib.input.FileSplit fileSplit = (org.apache.hadoop.mapreduce.lib.input.FileSplit) split;

        start = fileSplit.getStart();
        end = start + fileSplit.getLength();

        BufferedInputStream fileIn = new BufferedInputStream(fs.open(fileSplit.getPath()));
        // Jump to the point in the split at which the first complete record of the split starts,
        // if not the first InputSplit
        if (start != 0) {
            position = start - (start % recordByteLength) + recordByteLength;
            fileIn.skip(position);
        }
        reader.open(fileIn, copybook);

    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

---

From source file:co.nubetech.hiho.dedup.DelimitedLineRecordReader.java

License:Apache License

/**
 * /*from w  w  w.j a  v a 2 s. com*/
 * @param delimiter
 * @param column
 * 
 * 
 */

@Override
public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException {
    FileSplit split = (FileSplit) genericSplit;
    Configuration job = context.getConfiguration();
    this.delimiter = job.get(DelimitedTextInputFormat.DELIMITER_CONF);
    this.column = job.getInt(DelimitedTextInputFormat.COLUMN_CONF, 0);
    this.maxLineLength = job.getInt("mapred.linerecordreader.maxlength", Integer.MAX_VALUE);
    start = split.getStart();
    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:com.asakusafw.runtime.stage.input.TemporaryInputFormat.java

License:Apache License

@Override
public RecordReader<NullWritable, T> createRecordReader(InputSplit split, TaskAttemptContext context)
        throws IOException, InterruptedException {
    FileSplit s = (FileSplit) split;
    assert s.getStart() % TemporaryFile.BLOCK_SIZE == 0;
    assert s.getStart() > 0 || s.getLength() > 0;
    return createRecordReader();
}

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From source file:com.asakusafw.runtime.stage.input.TemporaryInputFormatTest.java

License:Apache License

private FileSplit find(List<FileSplit> splits, long start) {
    for (FileSplit split : splits) {
        if (split.getStart() == start) {
            return split;
        }/* www .j  ava2 s .c o m*/
    }
    throw new AssertionError(start);
}

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