@InterfaceAudience.Public @InterfaceStability.Stable public interface RecordReader<K,V> extends Closeable
RecordReader reads <key, value> pairs from an 
 InputSplit.
   
 RecordReader, typically, converts the byte-oriented view of 
 the input, provided by the InputSplit, and presents a 
 record-oriented view for the Mapper and Reducer tasks for
 processing. It thus assumes the responsibility of processing record 
 boundaries and presenting the tasks with keys and values.
InputSplit, 
InputFormat| Modifier and Type | Method and Description | 
|---|---|
| void | close()Close this  InputSplitto future operations. | 
| K | createKey()Create an object of the appropriate type to be used as a key. | 
| V | createValue()Create an object of the appropriate type to be used as a value. | 
| long | getPos()Returns the current position in the input. | 
| float | getProgress()How much of the input has the  RecordReaderconsumed i.e. | 
| boolean | next(K key,
    V value)Reads the next key/value pair from the input for processing. | 
boolean next(K key, V value) throws IOException
key - the key to read data intovalue - the value to read data intoIOExceptionK createKey()
V createValue()
long getPos()
     throws IOException
IOExceptionvoid close()
    throws IOException
InputSplit to future operations.close in interface AutoCloseableclose in interface CloseableIOExceptionfloat getProgress()
           throws IOException
RecordReader consumed i.e.
 has been processed by?0.0 to 1.0.IOExceptionCopyright © 2023 Apache Software Foundation. All rights reserved.