SynchronousChainedCombineDriver (Flink : Runtime 2.1.1 API)

java.lang.Object
- org.apache.flink.runtime.operators.chaining.ChainedDriver<IN,OUT>
- - org.apache.flink.runtime.operators.chaining.SynchronousChainedCombineDriver<IN,OUT>

Type Parameters:

IN - The data type consumed by the combiner.

OUT - The data type produced by the combiner.

All Implemented Interfaces:

org.apache.flink.util.Collector<IN>
```
public class SynchronousChainedCombineDriver<IN,OUT>
extends ChainedDriver<IN,OUT>
```
The chained variant of the combine driver which is also implemented in GroupReduceCombineDriver. In contrast to the GroupReduceCombineDriver, this driver's purpose is only to combine the values received in the chain. It is used by the GroupReduce and the CombineGroup transformation.

See Also:

GroupReduceCombineDriver

Field Summary
- Fields inherited from class org.apache.flink.runtime.operators.chaining.ChainedDriver
  config, executionConfig, metrics, numRecordsIn, numRecordsOut, objectReuseEnabled, outputCollector, taskName, userCodeClassLoader

Constructor Summary

Constructors
Constructor Description

SynchronousChainedCombineDriver()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`cancelTask()`
`void`	`close()`
`void`	`closeTask()`
`void`	`collect(IN record)`
`org.apache.flink.api.common.functions.Function`	`getStub()`
`String`	`getTaskName()`
`void`	`openTask()`
`void`	`setup(AbstractInvokable parent)`

Methods inherited from class org.apache.flink.runtime.operators.chaining.ChainedDriver
getIOMetrics, getOutputCollector, getTaskConfig, getUdfRuntimeContext, setOutputCollector, setup

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

- Constructor Detail
  - SynchronousChainedCombineDriver
```
public SynchronousChainedCombineDriver()
```
- Method Detail
  - setup
```
public void setup(AbstractInvokable parent)
```
    Specified by:
    
    setup in class ChainedDriver<IN,OUT>
  - openTask
```
public void openTask()
              throws Exception
```
    Specified by:
    
    openTask in class ChainedDriver<IN,OUT>
    
    Throws:
    
    Exception
  - closeTask
```
public void closeTask()
               throws Exception
```
    Specified by:
    
    closeTask in class ChainedDriver<IN,OUT>
    
    Throws:
    
    Exception
  - cancelTask
```
public void cancelTask()
```
    Specified by:
    
    cancelTask in class ChainedDriver<IN,OUT>
  - getStub
```
public org.apache.flink.api.common.functions.Function getStub()
```
    Specified by:
    
    getStub in class ChainedDriver<IN,OUT>
  - getTaskName
```
public String getTaskName()
```
    Specified by:
    
    getTaskName in class ChainedDriver<IN,OUT>
  - collect
```
public void collect(IN record)
```
    Specified by:
    
    collect in interface org.apache.flink.util.Collector<IN>
    
    Specified by:
    
    collect in class ChainedDriver<IN,OUT>
  - close
```
public void close()
```