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https://issues.apache.org/jira/browse/BEAM-5791?focusedWorklogId=157235&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-157235
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ASF GitHub Bot logged work on BEAM-5791:
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Author: ASF GitHub Bot
Created on: 22/Oct/18 21:58
Start Date: 22/Oct/18 21:58
Worklog Time Spent: 10m
Work Description: lukecwik commented on issue #6752: [BEAM-5791]
Implement time-based pushback in the dataflow harness data plane.
URL: https://github.com/apache/beam/pull/6752#issuecomment-432000417
R: @lukecwik
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Issue Time Tracking
-------------------
Worklog Id: (was: 157235)
Time Spent: 1h 20m (was: 1h 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: 1h 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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