org.apache.flink.runtime.checkpoint

Class SubtaskStateStats

java.lang.Object

org.apache.flink.runtime.checkpoint.SubtaskStateStats

All Implemented Interfaces:

Serializable

public class SubtaskStateStats
extends Object
implements Serializable

Statistics for a single subtask that is part of a checkpoint.

Collects data that is spread over different close places: CheckpointMetaData, SubtaskState, and PendingCheckpoint.

This is the smallest immutable unit of the stats.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
long	getAckTimestamp() Returns the timestamp when the acknowledgement of this subtask was received at the coordinator.
long	getAlignmentBuffered() Returns the number of bytes buffered during stream alignment (for exactly-once only).
long	getAlignmentDuration() Returns the duration of the stream alignment (for exactly-once only).
long	getAsyncCheckpointDuration() Returns the duration of the asynchronous part of the checkpoint.
long	getEndToEndDuration(long triggerTimestamp) Computes the duration since the given trigger timestamp.
long	getStateSize() Returns the size of the checkpointed state at this subtask.
int	getSubtaskIndex() Returns the subtask index.
long	getSyncCheckpointDuration() Returns the duration of the synchronous part of the checkpoint.

Methods inherited from class java.lang.Object

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

Method Detail

getSubtaskIndex

public int getSubtaskIndex()

Returns the subtask index.

Returns:

Subtask index.

getStateSize

public long getStateSize()

Returns the size of the checkpointed state at this subtask.

Returns:

Checkpoint state size of the sub task.

getAckTimestamp

public long getAckTimestamp()

Returns the timestamp when the acknowledgement of this subtask was received at the coordinator.

Returns:

ACK timestamp at the coordinator.

getEndToEndDuration

public long getEndToEndDuration(long triggerTimestamp)

Computes the duration since the given trigger timestamp.

If the trigger timestamp is greater than the ACK timestamp, this returns 0.

Parameters:

triggerTimestamp - Trigger timestamp of the checkpoint.

Returns:

Duration since the given trigger timestamp.

getSyncCheckpointDuration

public long getSyncCheckpointDuration()

Returns the duration of the synchronous part of the checkpoint.

Can return -1 if the runtime did not report this.

Returns:

Duration of the synchronous part of the checkpoint or -1.

getAsyncCheckpointDuration

public long getAsyncCheckpointDuration()

Returns the duration of the asynchronous part of the checkpoint.

Can return -1 if the runtime did not report this.

Returns:

Duration of the asynchronous part of the checkpoint or -1.

getAlignmentBuffered

public long getAlignmentBuffered()

Returns the number of bytes buffered during stream alignment (for exactly-once only).

Can return -1 if the runtime did not report this.

Returns:

Number of bytes buffered during stream alignment or -1.

getAlignmentDuration

public long getAlignmentDuration()

Returns the duration of the stream alignment (for exactly-once only).

Can return -1 if the runtime did not report this.

Returns:

Duration of the stream alignment or -1.