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Posted to issues@beam.apache.org by "Kyle Winkelman (JIRA)" <ji...@apache.org> on 2019/01/31 18:09:00 UTC
[jira] [Reopened] (BEAM-4783) Add bundleSize parameter to control
splitting of Spark sources (useful for Dynamic Allocation)
[ https://issues.apache.org/jira/browse/BEAM-4783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kyle Winkelman reopened BEAM-4783:
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I don't believe that #6884 fixed this correctly. Take a look at my new PR #7690.
> Add bundleSize parameter to control splitting of Spark sources (useful for Dynamic Allocation)
> ----------------------------------------------------------------------------------------------
>
> Key: BEAM-4783
> URL: https://issues.apache.org/jira/browse/BEAM-4783
> Project: Beam
> Issue Type: Improvement
> Components: runner-spark
> Affects Versions: 2.8.0
> Reporter: Kyle Winkelman
> Assignee: Kyle Winkelman
> Priority: Major
> Fix For: 2.8.0, 2.9.0
>
> Time Spent: 7h 10m
> Remaining Estimate: 0h
>
> When the spark-runner is used along with the configuration spark.dynamicAllocation.enabled=true the SourceRDD does not detect this. It then falls back to the value calculated in this description:
> // when running on YARN/SparkDeploy it's the result of max(totalCores, 2).
> // when running on Mesos it's 8.
> // when running local it's the total number of cores (local = 1, local[N] = N,
> // local[*] = estimation of the machine's cores).
> // ** the configuration "spark.default.parallelism" takes precedence over all of the above **
> So in most cases this default is quite small. This is an issue when using a very large input file as it will only get split in half.
> I believe that when Dynamic Allocation is enable the SourceRDD should use the DEFAULT_BUNDLE_SIZE and possibly expose a SparkPipelineOptions that allows you to change this DEFAULT_BUNDLE_SIZE.
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