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Posted to commits@beam.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/07/03 21:30:00 UTC
[jira] [Work logged] (BEAM-4727) Reduce metrics overhead
[ https://issues.apache.org/jira/browse/BEAM-4727?focusedWorklogId=118843&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-118843 ]
ASF GitHub Bot logged work on BEAM-4727:
----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Jul/18 21:29
Start Date: 03/Jul/18 21:29
Worklog Time Spent: 10m
Work Description: lostluck opened a new pull request #5884: [BEAM-4727] Re-use metric context throughout bundle
URL: https://github.com/apache/beam/pull/5884
There's overhead in re-allocating a context for every element, and since the Go SDK doesn't modify contexts at present, except to assign identifiers for metrics collection, avoiding the re-allocation costs this way seems reasonable.
Builds off of #5882
Before:
BenchmarkParDo_EmitSumFn-12 1000000 1202 ns/op 529 B/op
After:
BenchmarkParDo_EmitSumFn-12 1000000 1030 ns/op 481 B/op 3 allocs/op
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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/) | --- | --- | --- | --- | --- | ---
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_ValidatesRunner_Gearpump_Gradle/lastCompletedBuild/) | [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza_Gradle/lastCompletedBuild/) | [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark_Gradle/lastCompletedBuild/)
Python | [](https://builds.apache.org/job/beam_PostCommit_Python_Verify/lastCompletedBuild/) | --- | [](https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/) </br> [](https://builds.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/) | --- | --- | --- | ---
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Issue Time Tracking
-------------------
Worklog Id: (was: 118843)
Time Spent: 10m
Remaining Estimate: 0h
> Reduce metrics overhead
> -----------------------
>
> Key: BEAM-4727
> URL: https://issues.apache.org/jira/browse/BEAM-4727
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-go
> Reporter: Robert Burke
> Assignee: Robert Burke
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> There are a few opportunities to avoid metrics overhead.
> First when setting state in the context, we allocate a new one for the stored value, per element. This generates a fair amount of objects for the garbage collector too. If we retain and re-use contexts within a bundle, we would have the opportunity to save on these costs.
> Also, it's possible that we have overhead on the metric updating paths. We can possibly do better than the general sync.Map, and avoid the type assertion cost for extracting values of known types from the maps.
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