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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 Fri, 22 Jun 2018 15:11:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16520477#comment-16520477
] 

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

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

    https://github.com/apache/flink/pull/6186#discussion_r197476710
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/ttl/TtlStateVisibility.java
---
    @@ -0,0 +1,29 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.flink.runtime.state.ttl;
    +
    +/**
    + * This option configures whether to return expired user value or not.
    + */
    +public enum TtlStateVisibility {
    +	/** Return still available expired user value (not yet cleaned up). */
    +	Relaxed,
    --- End diff --
    
    Would explain this different in the comment. It means that expired state can be returned
if it is not yet cleaned up.


> 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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