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https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372587#comment-16372587
]
ASF GitHub Bot commented on FLINK-8360:
---------------------------------------
Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/5239#discussion_r169896224
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/CheckpointStreamWithResultProvider.java
---
@@ -172,4 +167,30 @@ public CheckpointStreamWithResultProvider create(
return new
CheckpointStreamWithResultProvider.PrimaryStreamOnly(primaryOut);
}
}
+
+ /**
+ * Helper method that takes a {@link SnapshotResult<StreamStateHandle>}
and a {@link KeyGroupRangeOffsets} and
+ * creates a {@link SnapshotResult<KeyGroupsStateHandle>} by combining
the key groups offsets with all the
+ * present stream state handles.
+ */
+ static SnapshotResult<KeyedStateHandle>
toKeyedStateHandleSnapshotResult(
+ @Nullable SnapshotResult<StreamStateHandle> snapshotResult,
--- End diff --
Already changed in my updated branch.
> 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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