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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9514) Create wrapper with TTL logic for value state
Date Mon, 25 Jun 2018 09:27:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522079#comment-16522079
] 

ASF GitHub Bot commented on FLINK-9514:
---------------------------------------

Github user sihuazhou commented on the issue:

    https://github.com/apache/flink/pull/6186
  
    @StefanRRichter Thanks for you reply! I think that makes sense, there is still a workaround
for the user to go. `+1` to implement the current approach firstly.


> Create wrapper with TTL logic for value state
> ---------------------------------------------
>
>                 Key: FLINK-9514
>                 URL: https://issues.apache.org/jira/browse/FLINK-9514
>             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
>
>
> TTL state decorator uses original state with packed TTL and add TTL logic using time
provider:
> {code:java}
> TtlValueState<V> implements ValueState<V> {
>   ValueState<TtlValue<V>> underlyingState;
>   InternalTimeService timeProvider;
>   V value() {
>     TtlValue<V> valueWithTtl = underlyingState.get();
>     // ttl logic here (e.g. update timestamp)
>     return valueWithTtl.getValue();
>   }
>   void update() { ... underlyingState.update(valueWithTtl) ...  }
> }
> {code}
> TTL decorators are apply to state produced by normal state binder in its TTL wrapper
from FLINK-9513



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