MapPartitionIterator (Flink : Runtime 2.1.0 API)

java.lang.Object
- org.apache.flink.streaming.api.operators.MapPartitionIterator<IN>

All Implemented Interfaces:

Iterator<IN>
```
@Internal
public class MapPartitionIterator<IN>
extends Object
implements Iterator<IN>
```
The MapPartitionIterator is an iterator used in the MapPartitionOperator.The task main thread will add records to it. It will set itself as the input parameter of MapPartitionFunction and execute the function.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static int DEFAULT_MAX_CACHE_NUM
  Max number of caches.
- Constructor Summary
  
  Constructors
  Constructor Description
  
  MapPartitionIterator(Consumer<Iterator<IN>> udf)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void addRecord(IN record)
  
  void close()
  
  boolean hasNext()
  
  IN next()
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  - Methods inherited from interface java.util.Iterator
    forEachRemaining, remove

- Field Detail
  - DEFAULT_MAX_CACHE_NUM
```
public static final int DEFAULT_MAX_CACHE_NUM
```
    Max number of caches.
    The constant defines the maximum number of caches that can be created. Its value is set to 100, which is considered sufficient for most parallel jobs. Each cache is a record and occupies a minimal amount of memory so the value is not excessively large.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - MapPartitionIterator
```
public MapPartitionIterator(Consumer<Iterator<IN>> udf)
```
- Method Detail
  - hasNext
```
public boolean hasNext()
```
    Specified by:
    
    hasNext in interface Iterator<IN>
  - next
```
public IN next()
```
    Specified by:
    
    next in interface Iterator<IN>
  - addRecord
```
public void addRecord(IN record)
```
  - close
```
public void close()
```