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https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365591#comment-16365591
]
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_r168479714
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/TaskLocalStateStore.java
---
@@ -55,25 +54,24 @@
/** */
private final Map<Long, TaskStateSnapshot>
storedTaskStateByCheckpointID;
- /** This is the base directory for all local state of the subtask that
owns this {@link TaskLocalStateStore}. */
- private final File subtaskLocalStateBaseDirectory;
+ /** The root directories for all local state of this {@link
TaskLocalStateStore}. */
+ private final File[] localStateRootDirectories;
public TaskLocalStateStore(
JobID jobID,
JobVertexID jobVertexID,
int subtaskIndex,
- File localStateRootDir) {
+ File[] localStateRootDirectories) {
this.jobID = jobID;
this.jobVertexID = jobVertexID;
this.subtaskIndex = subtaskIndex;
this.storedTaskStateByCheckpointID = new HashMap<>();
- this.subtaskLocalStateBaseDirectory =
- new File(localStateRootDir, createSubtaskPath(jobID,
jobVertexID, subtaskIndex));
+ this.localStateRootDirectories = localStateRootDirectories;
--- End diff --
`checkNotNull` missing.
> 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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