Stas Levin created BEAM-2074:
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Summary: SourceDStream's rate control mechanism may not work
Key: BEAM-2074
URL: https://issues.apache.org/jira/browse/BEAM-2074
Project: Beam
Issue Type: Bug
Components: runner-spark
Reporter: Stas Levin
Assignee: Stas Levin
If the {{boundMaxRecords}} for {{SourceDStream}} is not set (as a result of
users choosing not to specify
{{SparkPipelineOptions.setMaxRecordsPerBatch()}}), {{SourceDStream}} is
designed to use {{rateControlledMaxRecords()}} to determine the max number of
records it should be reading.
However, at the moment {{SourceDStream}} only consults
{{rateControlledMaxRecords()}} once, when it is created, thus following
instantiations of {{MicrobatchSource}} will be using the now-set-in-stone
{{boundMaxRecords}} value without consulting with
{{rateControlledMaxRecords()}}, making the rate controlling mechanism
sub-optimal.
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