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https://issues.apache.org/jira/browse/SPARK-11308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Renjie Liu updated SPARK-11308:
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Priority: Major (was: Minor)
> Change spark streaming's job scheduler logic to ensuer guaranteed order of
> batch processing
> -------------------------------------------------------------------------------------------
>
> Key: SPARK-11308
> URL: https://issues.apache.org/jira/browse/SPARK-11308
> Project: Spark
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 1.5.1
> Reporter: Renjie Liu
>
> In current implementation, spark streaming uses a thread pool to run jobs
> generated in each time interval and orders are not guaranteed, i.e., if jobs
> generated in time 1 takes time longer than the batch duration, jobs 2 will
> begin to execute and the finish order is not guaranteed. This implementation
> is not quite useful in practice since it may cost much more storage. For
> example, when we do a word count in spark streaming, to be accurate we need
> to store records for each batch rather than just word count in database to be
> idempotent. But if the processing order of each batch is guaranteed, we just
> need to store the last update time with word count in database to be
> idempotent. Just simply set the thread pool size to 1 may cause the system to
> be inefficient when there are more than one output streams. This feature can
> be implemented by giving each output stream a thread and jobs of each output
> stream are executed in order.
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