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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8360) Implement task-local state recovery
Date Wed, 31 Jan 2018 16:43:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347147#comment-16347147

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/state/StateSnapshotContextSynchronousImpl.java
    @@ -130,7 +136,7 @@ public OperatorStateCheckpointOutputStream getRawOperatorStateOutput()
throws Ex
     	private <T extends StreamStateHandle> void closeAndUnregisterStream(
    -		NonClosingCheckpointOutputStream<T> stream) throws IOException {
    +		NonClosingCheckpointOutputStream<? extends T> stream) throws IOException {
    --- End diff --
    Should be sufficient to have `NonClosingCheckpointOutputStream<? extends StreamStateHandle>`

> 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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