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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3109) Join two streams with two different buffer time
Date Fri, 29 Jan 2016 17:20:39 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123809#comment-15123809
] 

ASF GitHub Bot commented on FLINK-3109:
---------------------------------------

Github user aljoscha commented on the pull request:

    https://github.com/apache/flink/pull/1527#issuecomment-176869415
  
    Hi @wangyangjun,
    sorry for the long wait but I think we can get this PR in after some modifications. I'd
like to change the API a bit to separate it from the other Join implementation since that
class is already quite crowded. What I would propose is to add a method `timeJoin()` on DataStream
and a new class `TimeJoinedStreams` that is similar to `JoinedStreams` but specific to the
two-buffer time join.
    
    Could you also please add support for the Scala API, we try to keep the two APIs in sync.
If you need help with that, please let me know.


> Join two streams with two different buffer time
> -----------------------------------------------
>
>                 Key: FLINK-3109
>                 URL: https://issues.apache.org/jira/browse/FLINK-3109
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>    Affects Versions: 0.10.1
>            Reporter: Wang Yangjun
>              Labels: easyfix, patch
>             Fix For: 0.10.2
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> Current Flink streaming only supports join two streams on the same window. How to solve
this problem?
> For example, there are two streams. One is advertisements showed to users. The tuple
in which could be described as (id, showed timestamp). The other one is click stream -- (id,
clicked timestamp). We want get a joined stream, which includes all the advertisement that
is clicked by user in 20 minutes after showed.
> It is possible that after an advertisement is shown, some user click it immediately.
It is possible that "click" message arrives server earlier than "show" message because of
Internet delay. We assume that the maximum delay is one minute.
> Then the need is that we should alway keep a buffer(20 mins) of "show" stream and another
buffer(1 min) of "click" stream.
> It would be grate that there is such an API like.
> showStream.join(clickStream)
>             .where(keySelector)
>             .buffer(Time.of(20, TimeUnit.MINUTES))
>             .equalTo(keySelector)
>             .buffer(Time.of(1, TimeUnit.MINUTES))
>             .apply(JoinFunction)
> http://stackoverflow.com/questions/33849462/how-to-avoid-repeated-tuples-in-flink-slide-window-join/34024149#34024149



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