org.apache.flink.runtime.state

Interface ManagedSnapshotContext

All Known Subinterfaces:

FunctionSnapshotContext, StateSnapshotContext

All Known Implementing Classes:

StateSnapshotContextSynchronousImpl

@PublicEvolving
public interface ManagedSnapshotContext

This interface provides a context in which operators that use managed state (i.e. state that is managed by state backends) can perform a snapshot. As snapshots of the backends themselves are taken by the system, this interface mainly provides meta information about the checkpoint.

Method Summary

Modifier and Type	Method and Description
long	getCheckpointId() Returns the ID of the checkpoint for which the snapshot is taken.
long	getCheckpointTimestamp() Returns timestamp (wall clock time) when the master node triggered the checkpoint for which the state snapshot is taken.

Method Detail

getCheckpointId

long getCheckpointId()

Returns the ID of the checkpoint for which the snapshot is taken.

The checkpoint ID is guaranteed to be strictly monotonously increasing across checkpoints. For two completed checkpoints A and B, ID_B > ID_A means that checkpoint B subsumes checkpoint A, i.e., checkpoint B contains a later state than checkpoint A.

getCheckpointTimestamp

long getCheckpointTimestamp()

Returns timestamp (wall clock time) when the master node triggered the checkpoint for which the state snapshot is taken.