FileSplit (Hadoop 0.20.2-cdh3u0 API)
Date: 2011-03-25

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## org.apache.hadoop.mapred
Class FileSplit

    java.lang.Object
      org.apache.hadoop.mapreduce.InputSplit
          org.apache.hadoop.mapred.FileSplit

All Implemented Interfaces:
  Writable, InputSplit

    public class FileSplit

extends InputSplit
implements InputSplit

A section of an input file. Returned by `InputFormat.getSplits(JobConf, int)` and passed to `InputFormat.getRecordReader(InputSplit,JobConf,Reporter)`.

Constructor Summary
`FileSplit(Path file, long start, long length, JobConf conf)` Deprecated.
`FileSplit(Path file, long start, long length, String[] hosts)` Constructs a split with host information

Method Summary
`long` | `getLength()` The number of bytes in the file to process.
`String[]` | `getLocations()` Get the list of nodes by name where the data for the split would be local.
`Path` | `getPath()` The file containing this split's data.
`long` | `getStart()` The position of the first byte in the file to process.
`void` | `readFields(DataInput in)` Deserialize the fields of this object from `in`.
`String` | `toString()`
`void` | `write(DataOutput out)` Serialize the fields of this object to `out`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### FileSplit

    @Deprecated
    public FileSplit(Path file,
                                long start,
                                long length,
                                JobConf conf)

  Deprecated.

  Constructs a split.

  Parameters:
    `file` - the file name
    `start` - the position of the first byte in the file to process
    `length` - the number of bytes in the file to process

### FileSplit

    public FileSplit(Path file,
                     long start,
                     long length,
                     String[] hosts)

  Constructs a split with host information

  Parameters:
    `file` - the file name
    `start` - the position of the first byte in the file to process
    `length` - the number of bytes in the file to process
    `hosts` - the list of hosts containing the block, possibly null

Method Detail

### getPath

    public Path getPath()

  The file containing this split's data.

### getStart

    public long getStart()

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

### getLength

    public long getLength()

  The number of bytes in the file to process.

  Specified by:
    `getLength` in interface `InputSplit`
  Specified by:
    `getLength` in class `InputSplit`
  Returns:
    the number of bytes in the split

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### write

    public void write(DataOutput out)
               throws IOException

  Description copied from interface: `Writable`
  Serialize the fields of this object to `out`.

  Specified by:
    `write` in interface `Writable`
  Parameters:
    `out` - `DataOuput` to serialize this object into.
  Throws:
    `IOException`

### readFields

    public void readFields(DataInput in)
                    throws IOException

  Description copied from interface: `Writable`
  Deserialize the fields of this object from `in`.

  For efficiency, implementations should attempt to re-use storage in the existing object where possible.

  Specified by:
    `readFields` in interface `Writable`
  Parameters:
    `in` - `DataInput` to deseriablize this object from.
  Throws:
    `IOException`

### getLocations

    public String[] getLocations()
                          throws IOException

  Description copied from class: `InputSplit`
  Get the list of nodes by name where the data for the split would be local. The locations do not need to be serialized.

  Specified by:
    `getLocations` in interface `InputSplit`
  Specified by:
    `getLocations` in class `InputSplit`
  Returns:
    a new array of the node nodes.
  Throws:
    `IOException`

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