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https://issues.apache.org/jira/browse/FLINK-4558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-4558:
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Labels: auto-deprioritized-major auto-deprioritized-minor (was:
auto-deprioritized-major stale-minor)
Priority: Not a Priority (was: Minor)
This issue was labeled "stale-minor" 7 days ago and has not received any
updates so it is being deprioritized. If this ticket is actually Minor, please
raise the priority and ask a committer to assign you the issue or revive the
public discussion.
> Add support for synchronizing streams
> -------------------------------------
>
> Key: FLINK-4558
> URL: https://issues.apache.org/jira/browse/FLINK-4558
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Affects Versions: 1.1.0
> Reporter: Elias Levy
> Priority: Not a Priority
> Labels: auto-deprioritized-major, auto-deprioritized-minor
>
> As mentioned on the [mailing
> list|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/synchronizing-two-streams-td6830.html],
> there are use cases that require synchronizing two streams on via their
> times and where it is not practical to buffer all messages from one streams
> while waiting for the other to synchronize. Flink should add functionality
> to enable such use cases.
> This could be implemented by modifying TwoInputStreamOperator so that calls
> to processElement1 and processElement2 could return a value indicating that
> the element can't yet be processed, having the framework then pause
> processing for some time, potentially using exponential back off with a hard
> maximum, and then allowing the back pressure system to do its work and pause
> the stream.
> Alternatively, an API could be added to explicitly pause/unpause a stream.
> For ease of use either of these mechanism should be used to create a
> SynchronizedTwoInputStreamOperator that end users can utilize by passing a
> configurable time delta to use as a synchronization threshold.
>
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