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https://issues.apache.org/jira/browse/SPARK-30900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim resolved SPARK-30900.
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Fix Version/s: 3.1.0
Resolution: Fixed
Issue resolved by pull request 27649
[https://github.com/apache/spark/pull/27649]
> FileStreamSource: Avoid reading compact metadata log twice if the query stops
> from compact batch and restarts
> -------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-30900
> URL: https://issues.apache.org/jira/browse/SPARK-30900
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 3.1.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Minor
> Fix For: 3.1.0
>
>
> When restarting the query, there is a case which the query starts from
> compaction batch, and the batch has source metadata file to read. One case is
> that the previous query succeeded to read from inputs, but not finalized the
> batch for various reasons.
> This case FileStreamSource will read the compact metadata file twice, one for
> retrieving all files to build seen file map, another one for retrieving
> entries in the batch. If the query processes huge number of inputs so far,
> compact metadata file becomes considerably bigger, so reading once more adds
> unnecessary latency on processing startup batch.
> This issue tracks the effort to address this case.
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