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https://issues.apache.org/jira/browse/BEAM-12118?focusedWorklogId=583854&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-583854
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ASF GitHub Bot logged work on BEAM-12118:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Apr/21 21:43
Start Date: 15/Apr/21 21:43
Worklog Time Spent: 10m
Work Description: amaliujia merged pull request #14480:
URL: https://github.com/apache/beam/pull/14480
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Issue Time Tracking
-------------------
Worklog Id: (was: 583854)
Time Spent: 7h 10m (was: 7h)
> QueuingBeamFnDataClient adds polling latency to completing bundle processing
> ----------------------------------------------------------------------------
>
> Key: BEAM-12118
> URL: https://issues.apache.org/jira/browse/BEAM-12118
> Project: Beam
> Issue Type: Bug
> Components: java-fn-execution
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
> Time Spent: 7h 10m
> Remaining Estimate: 0h
>
> Currently the inboundDataClients are registered with recieve, and they add
> data to a queue. There is no explicit indication from the clients that they
> are no longer going to add values to the queue.
> Within QueueingBeamFnDataClient.drainAndBlock the queue is therefore polled
> and if nothing is present all clients are polled to see if they are complete.
> This design makes for unfortunate tradeoffs on poll timeout:
> - cpu wasted with small timeout
> - additional latency in noticing we have completed with larger timeout
> With the existing InboundDataClient interface, we could have a separate
> thread call awaitCompletion on all of the clients and then shutdown the queue
> (adding a poison pill perhaps)
> Or we could modify InboundDataClient interface to allow registering iterest
> in when the client is done producing elements. The existing clients all seem
> based upon futures which allow that.
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