[jira] [Created] (SPARK-10541) Allow ApplicationHistoryProviders to provide their own text when there aren't any complete apps

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created SPARK-10541:
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             Summary: Allow ApplicationHistoryProviders to provide their own text when there aren't any complete apps
                 Key: SPARK-10541
                 URL: https://issues.apache.org/jira/browse/SPARK-10541
             Project: Spark
          Issue Type: Improvement
          Components: Web UI
    Affects Versions: 1.5.0
            Reporter: Steve Loughran
            Priority: Minor


The current History Server text when there are no complete apps is hard coded for the FS provider and talks about log directories. As it is static text, it doesn't get any recent information from that FS provider itself, such as the directory it is looking at.

For other ApplicationHistoryProviders, there will be different reasons
for the list being empty, including, in the timeline implementation: failure to talk to the server, authentication failure, or simply no events being present.
Even {{FsHistoryProvider}} could help users by actually printing what the log directory was.

If a method {{emptyListingText()}} `was supported, each implementation could provide a live explanation of the current state




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