org.apache.flink.runtime.state

类 AbstractChannelStateHandle<Info>

java.lang.Object

org.apache.flink.runtime.state.AbstractChannelStateHandle<Info>

类型参数:

Info - type of channel info (e.g. InputChannelInfo).

所有已实现的接口:

Serializable, StateObject

直接已知子类:

InputChannelStateHandle, ResultSubpartitionStateHandle

@Internal
public abstract class AbstractChannelStateHandle<Info>
extends Object
implements StateObject

Abstract channel state handle.

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	AbstractChannelStateHandle.StateContentMetaInfo Describes the underlying content.

方法概要

限定符和类型	方法和说明
static Set<StreamStateHandle>	collectUniqueDelegates(Collection<? extends AbstractChannelStateHandle<?>>... collections)
void	discardState() Discards the state referred to and solemnly owned by this handle, to free up resources in the persistent storage.
boolean	equals(Object o)
StreamStateHandle	getDelegate()
Info	getInfo()
List<Long>	getOffsets()
long	getStateSize() Returns the size of the state in bytes.
int	getSubtaskIndex()
int	hashCode()
String	toString()

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

方法详细资料

collectUniqueDelegates

public static Set<StreamStateHandle> collectUniqueDelegates(Collection<? extends AbstractChannelStateHandle<?>>... collections)

discardState

public void discardState()
                  throws Exception

从接口复制的说明: StateObject

Discards the state referred to and solemnly owned by this handle, to free up resources in the persistent storage. This method is called when the state represented by this object will not be used any more.

指定者:

discardState 在接口中 StateObject

抛出:

Exception

getStateSize

public long getStateSize()

从接口复制的说明: StateObject

Returns the size of the state in bytes. If the size is not known, this method should return 0.

The values produced by this method are only used for informational purposes and for metrics/monitoring. If this method returns wrong values, the checkpoints and recovery will still behave correctly. However, efficiency may be impacted (wrong space pre-allocation) and functionality that depends on metrics (like monitoring) will be impacted.

Note for implementors: This method should not perform any I/O operations while obtaining the state size (hence it does not declare throwing an IOException). Instead, the state size should be stored in the state object, or should be computable from the state stored in this object. The reason is that this method is called frequently by several parts of the checkpointing and issuing I/O requests from this method accumulates a heavy I/O load on the storage system at higher scale.

指定者:

getStateSize 在接口中 StateObject

返回:

Size of the state in bytes.

getOffsets

public List<Long> getOffsets()

getDelegate

public StreamStateHandle getDelegate()

getInfo

public Info getInfo()

getSubtaskIndex

public int getSubtaskIndex()

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

toString

public String toString()

覆盖:

toString 在类中 Object