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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9513) Wrap state binder with TTL logic
Date Mon, 02 Jul 2018 12:23:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16529800#comment-16529800
] 

ASF GitHub Bot commented on FLINK-9513:
---------------------------------------

Github user StefanRRichter commented on the issue:

    https://github.com/apache/flink/pull/6196
  
    I had a few more comments, in particular some improvements for the new serializer. I think
when those are addressed this is good to merge.


> Wrap state binder with TTL logic
> --------------------------------
>
>                 Key: FLINK-9513
>                 URL: https://issues.apache.org/jira/browse/FLINK-9513
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.6.0
>            Reporter: Andrey Zagrebin
>            Assignee: Andrey Zagrebin
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.6.0
>
>
> The main idea is to wrap user state value with a class holding the value and the expiration
timestamp (maybe meta data in future) and use the new object as a value in the existing implementations:
> {code:java}
> class TtlValue<V> {
>   V value;
>   long expirationTimestamp;
> }
> {code}
> The original state binder factory is wrapped with TtlStateBinder if TTL is enabled:
> {code:java}
> state = ttlConfig.updateType == DISABLED ?
>  bind(binder) : bind(new TtlStateBinder(binder, timerService));
> {code}
> TtlStateBinder decorates the states produced by the original binder with TTL logic wrappers
and adds TtlValue serialisation logic:
> {code:java}
> TtlStateBinder {
>     StateBinder binder;
>     ProcessingTimeProvier timeProvider; // System.currentTimeMillis()
>     <V> TtlValueState<V> createValueState(valueDesc) {
>          serializer = new TtlValueSerializer(valueDesc.getSerializer);
>          ttlValueDesc = new ValueDesc(serializer, ...);
>          // or implement custom TypeInfo
>          originalStateWithTtl = binder.createValueState(valueDesc);
>          return new TtlValueState(originalStateWithTtl, timeProvider);
>     }
>       // List, Map, ...
> }
> {code}
> TTL serializer should add expiration timestamp



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