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Posted to issues@beam.apache.org by "Sunil Pedapudi (JIRA)" <ji...@apache.org> on 2019/03/13 05:05:00 UTC
[jira] [Updated] (BEAM-6819) Remote sources provide insufficient
metadata about relative sizes of splits
[ https://issues.apache.org/jira/browse/BEAM-6819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sunil Pedapudi updated BEAM-6819:
---------------------------------
Component/s: (was: runner-dataflow)
> Remote sources provide insufficient metadata about relative sizes of splits
> ---------------------------------------------------------------------------
>
> Key: BEAM-6819
> URL: https://issues.apache.org/jira/browse/BEAM-6819
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Sunil Pedapudi
> Priority: Minor
>
> In the current split protocol, SourceMetadata is reported for the initial parent source. Subsequent splits drop the SourceMetadata. Without this additional information, downstream systems make simplifying assumptions that result in decorrelation between input fraction and the actual fraction of input represented by a task.
> This decorrelation of input fraction has cascading negative effects for any system relying on trends in input fraction (eg., Cloud Dataflow's autotuning).
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