org.apache.flink.runtime.checkpoint

Class DefaultCompletedCheckpointStoreUtils

java.lang.Object

org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStoreUtils

public class DefaultCompletedCheckpointStoreUtils
extends Object

Helper methods related to DefaultCompletedCheckpointStore.

Method Summary

Modifier and Type	Method and Description
static int	getMaximumNumberOfRetainedCheckpoints(org.apache.flink.configuration.Configuration config, org.slf4j.Logger logger) Extracts maximum number of retained checkpoints configuration from the passed Configuration.
static <R extends ResourceVersion<R>> Collection<CompletedCheckpoint>	retrieveCompletedCheckpoints(StateHandleStore<CompletedCheckpoint,R> checkpointStateHandleStore, CheckpointStoreUtil completedCheckpointStoreUtil) Fetch all completed checkpoints from an external store.

Methods inherited from class java.lang.Object

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

Method Detail

getMaximumNumberOfRetainedCheckpoints

public static int getMaximumNumberOfRetainedCheckpoints(org.apache.flink.configuration.Configuration config,
                                                        org.slf4j.Logger logger)

Extracts maximum number of retained checkpoints configuration from the passed Configuration. The default value is used as a fallback if the passed value is a value larger than 0.

Parameters:

config - The configuration that is accessed.

logger - The Logger used for exposing the warning if the configured value is invalid.

Returns:

The maximum number of retained checkpoints based on the passed Configuration.

retrieveCompletedCheckpoints

public static <R extends ResourceVersion<R>> Collection<CompletedCheckpoint> retrieveCompletedCheckpoints(StateHandleStore<CompletedCheckpoint,R> checkpointStateHandleStore,
                                                                                                          CheckpointStoreUtil completedCheckpointStoreUtil)
                                                                                                   throws Exception

Fetch all completed checkpoints from an external store. This method is intended for retrieving an initial state of DefaultCompletedCheckpointStore.

Type Parameters:

R - Type of ResourceVersion

Parameters:

checkpointStateHandleStore - Completed checkpoints in external store.

completedCheckpointStoreUtil - Utilities for completed checkpoint store.

Returns:

Immutable collection of completed checkpoints.

Throws:

Exception - If we're not able to fetch checkpoints for some reason.