[jira] [Created] (SPARK-20656) Incremental parsing of event logs in SHS

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

Marcelo Vanzin created SPARK-20656:
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             Summary: Incremental parsing of event logs in SHS
                 Key: SPARK-20656
                 URL: https://issues.apache.org/jira/browse/SPARK-20656
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.3.0
            Reporter: Marcelo Vanzin


This feature is mentioned in the spec attached to SPARK-18085 but there's not a lot of discussion about it.

It would be good to implement incremental parsing of event logs in the SHS. With the new work, UI data is stored on disk, so it should be possible to save enough metadata about the event log and the state of the listeners to allow one to resume parsing the log of a live application at the point where it stopped in the previous iteration. 

This would considerably speed up parsing on updates, and could be done speculatively so that UIs for new applications are available in the SHS almost immediately.

I'm filing this as a separate enhancement because I don't want to block SPARK-18085 on this.



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