org.apache.hadoop.hive.ql.io
Class RCFile.KeyBuffer

java.lang.Object
  org.apache.hadoop.hive.ql.io.RCFile.KeyBuffer

All Implemented Interfaces:

Comparable, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable

Enclosing class:

RCFile

public static class RCFile.KeyBuffer
extends Object
implements org.apache.hadoop.io.WritableComparable

KeyBuffer is the key of each record in RCFile. Its on-disk layout is as below:

• record length in bytes,it is the sum of bytes used to store the key part and the value part.
• Key length in bytes, it is how many bytes used by the key part.
• number_of_rows_in_this_record(vint),
• column_1_ondisk_length(vint),
• column_1_row_1_value_plain_length,
• column_1_row_2_value_plain_length,
• ....
• column_2_ondisk_length(vint),
• column_2_row_1_value_plain_length,
• column_2_row_2_value_plain_length,
• .... .
• {the end of the key part}

Constructor Summary

RCFile.KeyBuffer()
Deprecated.

Method Summary

int	compareTo(Object arg0)
int	getColumnNumber()
int	getSize() get number of bytes to store the keyBuffer.
void	readFields(DataInput in)
void	write(DataOutput out)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RCFile.KeyBuffer

@Deprecated
public RCFile.KeyBuffer()

Deprecated.

Method Detail

getColumnNumber

public int getColumnNumber()

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

getSize

public int getSize()
            throws IOException

get number of bytes to store the keyBuffer.

Returns:

number of bytes used to store this KeyBuffer on disk

Throws:

IOException

compareTo

public int compareTo(Object arg0)

Specified by:

compareTo in interface Comparable