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https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365579#comment-16365579
]
ASF GitHub Bot commented on FLINK-8360:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/5239#discussion_r168472392
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/heap/HeapKeyedStateBackend.java
---
@@ -507,17 +509,78 @@ public boolean supportsAsynchronousSnapshots() {
return localRecoveryConfig;
}
+ private interface SnapshotStrategySynchronicityBehavior<K> {
+
+ default void finalizeSnapshotBeforeReturnHook(Runnable
runnable) {
+
+ }
+
+ default void logOperationCompleted(CheckpointStreamFactory
streamFactory, long startTime) {
+
+ }
+
+ boolean isAsynchronous();
+
+ <N, V> StateTable<K, N, V>
newStateTable(RegisteredKeyedBackendStateMetaInfo<N, V> newMetaInfo);
--- End diff --
I think this method should be part of the `SnapshotStrategy` interface.
That way we would make the `SnapshotStrategySynchronicityBehavior` sub classes
independent of the `HeapKeyedStateBackend`.
> Implement task-local state recovery
> -----------------------------------
>
> Key: FLINK-8360
> URL: https://issues.apache.org/jira/browse/FLINK-8360
> Project: Flink
> Issue Type: New Feature
> Components: State Backends, Checkpointing
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Major
> Fix For: 1.5.0
>
>
> This issue tracks the development of recovery from task-local state. The main
> idea is to have a secondary, local copy of the checkpointed state, while
> there is still a primary copy in DFS that we report to the checkpoint
> coordinator.
> Recovery can attempt to restore from the secondary local copy, if available,
> to save network bandwidth. This requires that the assignment from tasks to
> slots is as sticky is possible.
> For starters, we will implement this feature for all managed keyed states and
> can easily enhance it to all other state types (e.g. operator state) later.
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