PipelinedApproximateSubpartition (Flink : Runtime 2.0-preview1 API)

java.lang.Object
- org.apache.flink.runtime.io.network.partition.ResultSubpartition
- - org.apache.flink.runtime.io.network.partition.PipelinedSubpartition
  - - org.apache.flink.runtime.io.network.partition.PipelinedApproximateSubpartition

All Implemented Interfaces:

ChannelStateHolder
```
public class PipelinedApproximateSubpartition
extends PipelinedSubpartition
```
A pipelined in-memory only subpartition, which allows to reconnect after failure. Only one view is allowed at a time to read teh subpartition.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.flink.runtime.io.network.partition.ResultSubpartition
  ResultSubpartition.BufferAndBacklog

Field Summary
- Fields inherited from class org.apache.flink.runtime.io.network.partition.ResultSubpartition
  ADD_BUFFER_ERROR_CODE, parent, subpartitionInfo

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`PipelinedSubpartitionView`	`createReadView(BufferAvailabilityListener availabilityListener)`	To simply the view releasing threading model, `releaseView()` is called only before creating a new view.
`boolean`	`isSupportChannelStateRecover()`

Methods inherited from class org.apache.flink.runtime.io.network.partition.PipelinedSubpartition
abortCheckpoint, acknowledgeAllDataProcessed, add, alignedBarrierTimeout, bufferSize, finish, flush, getAvailabilityAndBacklog, getBuffersInBacklogUnsafe, getChannelStateCheckpointId, getNumberOfQueuedBuffers, getTotalNumberOfBuffersUnsafe, getTotalNumberOfBytesUnsafe, isReleased, release, setChannelStateWriter, toString, unsynchronizedGetNumberOfQueuedBuffers

Methods inherited from class org.apache.flink.runtime.io.network.partition.ResultSubpartition
add, getSubPartitionIndex, getSubpartitionInfo, onConsumedSubpartition

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

- Method Detail
  - createReadView
```
public PipelinedSubpartitionView createReadView(BufferAvailabilityListener availabilityListener)
```
    To simply the view releasing threading model, releaseView() is called only before creating a new view.
    There is still one corner case when a downstream task fails continuously in a short period of time then multiple netty worker threads can createReadView at the same time. TODO: This problem will be solved in FLINK-19774
    
    Overrides:
    
    createReadView in class PipelinedSubpartition
  - isSupportChannelStateRecover
```
public boolean isSupportChannelStateRecover()
```
    Overrides:
    
    isSupportChannelStateRecover in class PipelinedSubpartition