Sean Owen updated SPARK-17406:
    Assignee: cen yuhai

> Event Timeline will be very slow when there are too many executor events
> ------------------------------------------------------------------------
>                 Key: SPARK-17406
>                 URL: https://issues.apache.org/jira/browse/SPARK-17406
>             Project: Spark
>          Issue Type: Improvement
>          Components: Web UI
>    Affects Versions: 1.6.2, 2.0.0
>            Reporter: cen yuhai
>            Assignee: cen yuhai
>            Priority: Minor
>             Fix For: 2.1.0
>         Attachments: timeline1.png, timeline2.png
> The job page will be too slow to open when there are thousands of executor 
> events(added or removed). I found that in ExecutorsTab file, executorIdToData 
> will not remove elements, it will increase all the time. Before this pr, it 
> looks like timeline1.png. After this pr, it looks like timeline2.png(we can 
> set how many events will be displayed)

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