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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9489) Checkpoint timers as part of managed keyed state instead of raw keyed state
Date Sun, 15 Jul 2018 20:47:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16544672#comment-16544672
] 

ASF GitHub Bot commented on FLINK-9489:
---------------------------------------

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

    https://github.com/apache/flink/pull/6333#discussion_r202552483
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/KeyExtractorFunction.java
---
    @@ -28,9 +28,22 @@
     @FunctionalInterface
     public interface KeyExtractorFunction<T> {
     
    +	KeyExtractorFunction<? extends Keyed<?>> FOR_KEYED_OBJECTS = new KeyExtractorFunction<Keyed<?>>()
{
    +		@Nonnull
    +		@Override
    +		public Object extractKeyFromElement(@Nonnull Keyed<?> element) {
    +			return element.getKey();
    +		}
    +	};
    --- End diff --
    
    Could we move this extractor into its own `KeyedKeyExtractorFunction` singleton?


> Checkpoint timers as part of managed keyed state instead of raw keyed state
> ---------------------------------------------------------------------------
>
>                 Key: FLINK-9489
>                 URL: https://issues.apache.org/jira/browse/FLINK-9489
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.6.0
>
>
> Timer state should now become part of the keyed state backend snapshot, i.e., stored
inside the managed keyed state. This means that we have to connect our preparation for asynchronous
checkpoints with the backend, so that the timers are written as part of the state for each
key-group. This means that we will also free up the raw keyed state an might expose it to
user functions in the future.



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