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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8360) Implement task-local state recovery
Date Thu, 15 Feb 2018 15:34:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365742#comment-16365742

ASF GitHub Bot commented on FLINK-8360:

Github user tillrohrmann commented on a diff in the pull request:

    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/TaskStateSnapshot.java
    @@ -75,7 +79,10 @@ public OperatorSubtaskState getSubtaskStateByOperatorID(OperatorID
operatorID) {
     	 * Maps the given operator id to the given subtask state. Returns the subtask state
of a previous mapping, if such
     	 * a mapping existed or null otherwise.
    -	public OperatorSubtaskState putSubtaskStateByOperatorID(OperatorID operatorID, OperatorSubtaskState
state) {
    +	public OperatorSubtaskState putSubtaskStateByOperatorID(
    --- End diff --
    `@Nullable` 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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