org.apache.flink.runtime.state

类 OperatorStreamStateHandle

java.lang.Object

org.apache.flink.runtime.state.OperatorStreamStateHandle

所有已实现的接口:

Serializable, OperatorStateHandle, StateObject, StreamStateHandle

public class OperatorStreamStateHandle
extends Object
implements OperatorStateHandle

State handle for partitionable operator state. Besides being a StreamStateHandle, this also provides a map that contains the offsets to the partitions of named states in the stream.

另请参阅:

序列化表格

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.runtime.state.OperatorStateHandle

OperatorStateHandle.Mode, OperatorStateHandle.StateMetaInfo

构造器概要

构造器

构造器和说明
OperatorStreamStateHandle(Map<String,OperatorStateHandle.StateMetaInfo> stateNameToPartitionOffsets, StreamStateHandle delegateStateHandle)

方法概要

限定符和类型	方法和说明
Optional<byte[]>	asBytesIfInMemory()
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	getDelegateStateHandle() Returns the underlying stream state handle that points to the state data.
Map<String,OperatorStateHandle.StateMetaInfo>	getStateNameToPartitionOffsets() Returns a map of meta data for all contained states by their name.
long	getStateSize() Returns the size of the state in bytes.
int	hashCode()
org.apache.flink.core.fs.FSDataInputStream	openInputStream() Returns an input stream to read the operator state information.
String	toString()

从类继承的方法 java.lang.Object

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

构造器详细资料

OperatorStreamStateHandle

public OperatorStreamStateHandle(Map<String,OperatorStateHandle.StateMetaInfo> stateNameToPartitionOffsets,
                                 StreamStateHandle delegateStateHandle)

方法详细资料

getStateNameToPartitionOffsets

public Map<String,OperatorStateHandle.StateMetaInfo> getStateNameToPartitionOffsets()

从接口复制的说明: OperatorStateHandle

Returns a map of meta data for all contained states by their name.

指定者:

getStateNameToPartitionOffsets 在接口中 OperatorStateHandle

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.

openInputStream

public org.apache.flink.core.fs.FSDataInputStream openInputStream()
                                                           throws IOException

从接口复制的说明: OperatorStateHandle

Returns an input stream to read the operator state information.

指定者:

openInputStream 在接口中 OperatorStateHandle

指定者:

openInputStream 在接口中 StreamStateHandle

抛出:

IOException

asBytesIfInMemory

public Optional<byte[]> asBytesIfInMemory()

指定者:

asBytesIfInMemory 在接口中 StreamStateHandle

返回:

Content of this handle as bytes array if it is already in memory.

getDelegateStateHandle

public StreamStateHandle getDelegateStateHandle()

从接口复制的说明: OperatorStateHandle

Returns the underlying stream state handle that points to the state data.

指定者:

getDelegateStateHandle 在接口中 OperatorStateHandle

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