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https://issues.apache.org/jira/browse/SPARK-6951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14935359#comment-14935359
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Thomas Graves commented on SPARK-6951:
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I'm still seeing history server startup really slow in 1.5.1... SPARK-5522 may
have helped although I don't see it showing list of application names in the
UI without the data from those so not sure if that pr did what description says.
It would be really nice is it could get metadata without having to parse the
entire log.
> History server slow startup if the event log directory is large
> ---------------------------------------------------------------
>
> Key: SPARK-6951
> URL: https://issues.apache.org/jira/browse/SPARK-6951
> Project: Spark
> Issue Type: Bug
> Components: Web UI
> Affects Versions: 1.3.0
> Reporter: Matt Cheah
>
> I started my history server, then navigated to the web UI where I expected to
> be able to view some completed applications, but the webpage was not
> available. It turned out that the History Server was not finished parsing all
> of the event logs in the event log directory that I had specified. I had
> accumulated a lot of event logs from months of running Spark, so it would
> have taken a very long time for the History Server to crunch through them
> all. I purged the event log directory and started from scratch, and the UI
> loaded immediately.
> We should have a pagination strategy or parse the directory lazily to avoid
> needing to wait after starting the history server.
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