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https://issues.apache.org/jira/browse/BEAM-6612?focusedWorklogId=206598&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-206598
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ASF GitHub Bot logged work on BEAM-6612:
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Author: ASF GitHub Bot
Created on: 01/Mar/19 19:12
Start Date: 01/Mar/19 19:12
Worklog Time Spent: 10m
Work Description: ajamato commented on issue #7895: [Do not merge]
[BEAM-6612] Improve java SDK performance by using a LinkedBlockingQueue
URL: https://github.com/apache/beam/pull/7895#issuecomment-468777667
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Issue Time Tracking
-------------------
Worklog Id: (was: 206598)
Time Spent: 1h 20m (was: 1h 10m)
> PerformanceRegression in QueueingBeamFnDataClient
> -------------------------------------------------
>
> Key: BEAM-6612
> URL: https://issues.apache.org/jira/browse/BEAM-6612
> Project: Beam
> Issue Type: New Feature
> Components: java-fn-execution
> Reporter: Alex Amato
> Assignee: Alex Amato
> Priority: Major
> Labels: triaged
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Remove QueueingBeamFnDataClient, which made process() calls all run on the
> same thread.
> [~lcwik] and I came up with this design thinking that it was required to
> process the bundle in parallel anyways, and we would have good performance.
> However after speaking to Ken, there is no requirement for a bundle or key to
> be processed in parallel. Elements are either iterables or single elements
> which defines the needs for processing a group of elements on the same thread.
> Simply performing this change will lead to the following issues:
> (1) MetricsContainerImpl and MetricsContainer are not thread safe, so when
> the process() functions enter the metric container context, they will be
> accessing an thread-unsafe collection in parallel
> (2) An ExecutionStateTracker will be needed in every thread, So we will need
> to
> create an instance and activate it in every GrpC thread which receives a new
> element.
> (Will this get sampled properly, since the trackers will be short lived).
> (3) The SimpleExecutionStates being used will need to be thread safe as well?
> I don't think so, because I don't think that the ExecutionStateSampler
> invokes them in parallel.
>
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