[jira] [Commented] (SPARK-17604) Support purging aged file entry for FileStreamSource metadata log

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-17604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15515232#comment-15515232 ] 

Apache Spark commented on SPARK-17604:
--------------------------------------

User 'jerryshao' has created a pull request for this issue:
https://github.com/apache/spark/pull/15210

> Support purging aged file entry for FileStreamSource metadata log
> -----------------------------------------------------------------
>
>                 Key: SPARK-17604
>                 URL: https://issues.apache.org/jira/browse/SPARK-17604
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL, Streaming
>            Reporter: Saisai Shao
>            Priority: Minor
>
> Currently with SPARK-15698, FileStreamSource metadata log will be compacted periodically (10 batches by default), this means compacted batch file will contain whole file entries been processed. With the time passed, the compacted batch file will be accumulated to a relative large file. 
> With SPARK-17165, now {{FileStreamSource}} doesn't track the aged file entry, but in the log we still keep the full records,  this is not necessary and quite time-consuming during recovery. So here propose to also add file entry purging ability to {{FileStreamSource}} metadata log.
> This is pending on SPARK-15698.



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