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https://issues.apache.org/jira/browse/BEAM-5791?focusedWorklogId=156354&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-156354
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ASF GitHub Bot logged work on BEAM-5791:
----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Oct/18 14:54
Start Date: 19/Oct/18 14:54
Worklog Time Spent: 10m
Work Description: robertwb opened a new pull request #6752: [BEAM-5791]
Implement time-based pushback in the dataflow harness data plane.
URL: https://github.com/apache/beam/pull/6752
If the SDK provides metrics on element consumption, we record this rate to
throttle (if needed) the rate at which we write elements to the buffer.
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Post-Commit Tests Status (on master branch)
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Lang | SDK | Apex | Dataflow | Flink | Gearpump | Samza | Spark
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Go | [](https://builds.apache.org/job/beam_PostCommit_Go_GradleBuild/lastCompletedBuild/)
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Java | [](https://builds.apache.org/job/beam_PostCommit_Java_GradleBuild/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Apex_Gradle/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Gradle/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Gradle/lastCompletedBuild/)
[](https://builds.apache.org/job/beam_PostCommit_Java_PVR_Flink/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Gearpump_Gradle/lastCompletedBuild/)
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Python | [](https://builds.apache.org/job/beam_PostCommit_Python_Verify/lastCompletedBuild/)
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</br> [](https://builds.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Python_VR_Flink/lastCompletedBuild/)
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Issue Time Tracking
-------------------
Worklog Id: (was: 156354)
Time Spent: 20m (was: 10m)
> Bound the amount of data on the data plane by time.
> ---------------------------------------------------
>
> Key: BEAM-5791
> URL: https://issues.apache.org/jira/browse/BEAM-5791
> Project: Beam
> Issue Type: Improvement
> Components: runner-dataflow, sdk-java-harness, sdk-py-harness
> Reporter: Robert Bradshaw
> Assignee: Henning Rohde
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> This is especially important for Fn API reads, where each element represents
> a shard to read and may be very expensive, but many elements may be waiting
> in the Fn API buffer.
> The need for this will be mitigated with full SDF support for liquid sharding
> over the Fn API, but not eliminated unless the runner can "unread" elements
> it has already sent.
> This is especially important in for dataflow jobs that start out small but
> then detect that they need more workers (e.g. due to the initial inputs being
> an SDF).
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