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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 stale-minor (was:
auto-deprioritized-major)
I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help
the community manage its development. I see this issues has been marked as
Minor but is unassigned and neither itself nor its Sub-Tasks have been updated
for 180 days. I have gone ahead and marked it "stale-minor". If this ticket is
still Minor, please either assign yourself or give an update. Afterwards,
please remove the label or in 7 days the issue will be deprioritized.
> 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: Minor
> Labels: auto-deprioritized-major, stale-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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