Reynold Xin commented on SPARK-15698:

This one is important for streaming running 24/7 for map-only ETL.

> Ability to remove old metadata for structure streaming MetadataLog
> ------------------------------------------------------------------
>                 Key: SPARK-15698
>                 URL: https://issues.apache.org/jira/browse/SPARK-15698
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL, Streaming
>            Reporter: Saisai Shao
>            Priority: Minor
> Current MetadataLog lacks the ability to remove old checkpoint file, we'd 
> better add this functionality to the MetadataLog and honor it in the place 
> where MetadataLog is used, that will reduce unnecessary small files in the 
> long running scenarios.

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