Saisai Shao created SPARK-17604:

             Summary: Support purging aged file entry for FileStreamSource 
metadata log
                 Key: SPARK-17604
             Project: Spark
          Issue Type: Improvement
          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.

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