org.apache.flink.runtime.checkpoint.channel

类 ChannelStateWriterImpl

java.lang.Object

org.apache.flink.runtime.checkpoint.channel.ChannelStateWriterImpl

所有已实现的接口:

Closeable, AutoCloseable, ChannelStateWriter

@Internal
 @ThreadSafe
public class ChannelStateWriterImpl
extends Object
implements ChannelStateWriter

ChannelStateWriter implemented using CheckpointStateOutputStreams. Internally, it has by default

• one stream per checkpoint; having multiple streams would mean more files written and more connections opened (and more latency on restore)
• one thread; having multiple threads means more connections, couples with the implementation and increases complexity

Thread-safety: this class is thread-safe when used with a thread-safe executor (e.g. default ChannelStateWriteRequestExecutorImpl.

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.runtime.checkpoint.channel.ChannelStateWriter

ChannelStateWriter.ChannelStateWriteResult, ChannelStateWriter.NoOpChannelStateWriter

字段概要

从接口继承的字段 org.apache.flink.runtime.checkpoint.channel.ChannelStateWriter

NO_OP, SEQUENCE_NUMBER_RESTORED, SEQUENCE_NUMBER_UNKNOWN

构造器概要

构造器

构造器和说明
ChannelStateWriterImpl(String taskName, int subtaskIndex, CheckpointStorageWorkerView streamFactoryResolver) Creates a ChannelStateWriterImpl with DEFAULT_MAX_CHECKPOINTS as maxCheckpoints.

方法概要

限定符和类型	方法和说明
void	abort(long checkpointId, Throwable cause, boolean cleanup) Aborts the checkpoint and fails pending result for this checkpoint.
void	addInputData(long checkpointId, InputChannelInfo info, int startSeqNum, org.apache.flink.util.CloseableIterator<Buffer> iterator) Add in-flight buffers from the InputChannel.
void	addOutputData(long checkpointId, ResultSubpartitionInfo info, int startSeqNum, Buffer... data) Add in-flight buffers from the ResultSubpartition.
void	close()
void	finishInput(long checkpointId) Finalize write of channel state data for the given checkpoint id.
void	finishOutput(long checkpointId) Finalize write of channel state data for the given checkpoint id.
ChannelStateWriter.ChannelStateWriteResult	getAndRemoveWriteResult(long checkpointId) Must be called after ChannelStateWriter.start(long, CheckpointOptions) once.
void	open()
void	start(long checkpointId, CheckpointOptions checkpointOptions) Initiate write of channel state for the given checkpoint id.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ChannelStateWriterImpl

public ChannelStateWriterImpl(String taskName,
                              int subtaskIndex,
                              CheckpointStorageWorkerView streamFactoryResolver)

Creates a ChannelStateWriterImpl with DEFAULT_MAX_CHECKPOINTS as maxCheckpoints.

方法详细资料

start

public void start(long checkpointId,
                  CheckpointOptions checkpointOptions)

从接口复制的说明: ChannelStateWriter

Initiate write of channel state for the given checkpoint id.

指定者:

start 在接口中 ChannelStateWriter

addInputData

public void addInputData(long checkpointId,
                         InputChannelInfo info,
                         int startSeqNum,
                         org.apache.flink.util.CloseableIterator<Buffer> iterator)

从接口复制的说明: ChannelStateWriter

Add in-flight buffers from the InputChannel. Must be called after ChannelStateWriter.start(long, org.apache.flink.runtime.checkpoint.CheckpointOptions) (long)} and before ChannelStateWriter.finishInput(long). Buffers are recycled after they are written or exception occurs.

指定者:

addInputData 在接口中 ChannelStateWriter

startSeqNum - sequence number of the 1st passed buffer. It is intended to use for incremental snapshots. If no data is passed it is ignored.

iterator - zero or more data buffers ordered by their sequence numbers

另请参阅:

ChannelStateWriter.SEQUENCE_NUMBER_RESTORED, ChannelStateWriter.SEQUENCE_NUMBER_UNKNOWN

addOutputData

public void addOutputData(long checkpointId,
                          ResultSubpartitionInfo info,
                          int startSeqNum,
                          Buffer... data)

从接口复制的说明: ChannelStateWriter

Add in-flight buffers from the ResultSubpartition. Must be called after ChannelStateWriter.start(long, org.apache.flink.runtime.checkpoint.CheckpointOptions) and before ChannelStateWriter.finishOutput(long). Buffers are recycled after they are written or exception occurs.

指定者:

addOutputData 在接口中 ChannelStateWriter

startSeqNum - sequence number of the 1st passed buffer. It is intended to use for incremental snapshots. If no data is passed it is ignored.

data - zero or more data buffers ordered by their sequence numbers

另请参阅:

ChannelStateWriter.SEQUENCE_NUMBER_RESTORED, ChannelStateWriter.SEQUENCE_NUMBER_UNKNOWN

finishInput

public void finishInput(long checkpointId)

从接口复制的说明: ChannelStateWriter

Finalize write of channel state data for the given checkpoint id. Must be called after ChannelStateWriter.start(long, CheckpointOptions) and all of the input data of the given checkpoint added. When both ChannelStateWriter.finishInput(long) and ChannelStateWriter.finishOutput(long) were called the results can be (eventually) obtained using ChannelStateWriter.getAndRemoveWriteResult(long)

指定者:

finishInput 在接口中 ChannelStateWriter

finishOutput

public void finishOutput(long checkpointId)

从接口复制的说明: ChannelStateWriter

Finalize write of channel state data for the given checkpoint id. Must be called after ChannelStateWriter.start(long, CheckpointOptions) and all of the output data of the given checkpoint added. When both ChannelStateWriter.finishInput(long) and ChannelStateWriter.finishOutput(long) were called the results can be (eventually) obtained using ChannelStateWriter.getAndRemoveWriteResult(long)

指定者:

finishOutput 在接口中 ChannelStateWriter

abort

public void abort(long checkpointId,
                  Throwable cause,
                  boolean cleanup)

从接口复制的说明: ChannelStateWriter

Aborts the checkpoint and fails pending result for this checkpoint.

指定者:

abort 在接口中 ChannelStateWriter

cleanup - true if ChannelStateWriter.getAndRemoveWriteResult(long) is not supposed to be called afterwards.

getAndRemoveWriteResult

public ChannelStateWriter.ChannelStateWriteResult getAndRemoveWriteResult(long checkpointId)

从接口复制的说明: ChannelStateWriter

Must be called after ChannelStateWriter.start(long, CheckpointOptions) once.

指定者:

getAndRemoveWriteResult 在接口中 ChannelStateWriter

open

public void open()

close

public void close()
           throws IOException

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

抛出:

IOException