org.apache.flink.runtime.state.filemerging

类 SegmentFileStateHandle

java.lang.Object

org.apache.flink.runtime.state.filemerging.SegmentFileStateHandle

所有已实现的接口:

Serializable, StateObject, StreamStateHandle

直接已知子类:

EmptySegmentFileStateHandle

public class SegmentFileStateHandle
extends Object
implements StreamStateHandle

FileStateHandle for state that was written to a file segment. A SegmentFileStateHandle represents a LogicalFile, which has already been written to a segment in a physical file.

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.StateObject

StateObject.StateObjectLocation, StateObject.StateObjectSizeStatsCollector

字段概要

字段

限定符和类型	字段和说明
protected long	stateSize The size of the state in the file.

构造器概要

构造器

构造器和说明
SegmentFileStateHandle(org.apache.flink.core.fs.Path filePath, long startPos, long stateSize, CheckpointedStateScope scope, LogicalFile.LogicalFileId fileId) Creates a new segment file state for the given file path.

方法概要

限定符和类型	方法和说明
Optional<byte[]>	asBytesIfInMemory()
void	collectSizeStats(StateObject.StateObjectSizeStatsCollector collector) Collects statistics about state size and location from the state object.
void	discardState() This method should be empty, so that JM is not in charge of the lifecycle of files in a file-merging checkpoint.
boolean	equals(Object o)
org.apache.flink.core.fs.Path	getFilePath() Gets the path where this handle's state is stored.
LogicalFile.LogicalFileId	getLogicalFileId()
CheckpointedStateScope	getScope()
long	getStartPos()
long	getStateSize() Returns the size of the state in bytes.
PhysicalStateHandleID	getStreamStateHandleID()
int	hashCode()
org.apache.flink.core.fs.FSDataInputStream	openInputStream() Returns an FSDataInputStream that can be used to read back the data that was previously written to the stream.
String	toString()

从类继承的方法 java.lang.Object

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

字段详细资料

stateSize

protected final long stateSize

The size of the state in the file.

构造器详细资料

SegmentFileStateHandle

public SegmentFileStateHandle(org.apache.flink.core.fs.Path filePath,
                              long startPos,
                              long stateSize,
                              CheckpointedStateScope scope,
                              LogicalFile.LogicalFileId fileId)

Creates a new segment file state for the given file path.

参数:

filePath - The path to the file that stores the state.

startPos - Start position of the segment in the physical file.

stateSize - Size of the segment.

scope - The state's scope, whether it is exclusive or shared.

fileId - The corresponding logical file id.

方法详细资料

discardState

public void discardState()

This method should be empty, so that JM is not in charge of the lifecycle of files in a file-merging checkpoint.

指定者:

discardState 在接口中 StateObject

getFilePath

public org.apache.flink.core.fs.Path getFilePath()

Gets the path where this handle's state is stored.

返回:

The path where this handle's state is stored.

openInputStream

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

从接口复制的说明: StreamStateHandle

Returns an FSDataInputStream that can be used to read back the data that was previously written to the stream.

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.

getStreamStateHandleID

public PhysicalStateHandleID getStreamStateHandleID()

指定者:

getStreamStateHandleID 在接口中 StreamStateHandle

返回:

a unique identifier of this handle.

getStartPos

public long getStartPos()

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.

collectSizeStats

public void collectSizeStats(StateObject.StateObjectSizeStatsCollector collector)

从接口复制的说明: StateObject

Collects statistics about state size and location from the state object.

指定者:

collectSizeStats 在接口中 StateObject

参数:

collector - the statistics collector.

getScope

public CheckpointedStateScope getScope()

getLogicalFileId

public LogicalFile.LogicalFileId getLogicalFileId()

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