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https://issues.apache.org/jira/browse/IMPALA-13233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17866801#comment-17866801
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Surya Hebbar commented on IMPALA-13233:
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To improve this representation, the phases of each fragment's instances are now
being shown parallelly on the query timeline, making it easier to identify the
start and end of all instance's phases.
Outlines are drawn at the top and bottom of each plan node, according to the
timestamp of the instances' final closing phase.
The attribute 'stroke-dasharray' has been used to add separators between the
perimeters of each instance's phases, instead of an additional SVG line element
each time.
> Represent phases of each instance separately on the webUI's query timeline
> --------------------------------------------------------------------------
>
> Key: IMPALA-13233
> URL: https://issues.apache.org/jira/browse/IMPALA-13233
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Surya Hebbar
> Assignee: Surya Hebbar
> Priority: Major
>
> Currently, in the query timeline, each instance's phases are represented
> together in a single bar with dividers to show when each phase has finished.
> This results in several problems as follows.
> * If phases of multiple instances end at the same time, it is often hard or
> impossible to distinguish.
> * Huge profiles with a large number of instances produce mostly black lines,
> which would not be desired by the user.
> * In the case of multiple instances, each phase overlaps the next, hence
> blocking the user from realizing that other instances have started with the
> next phase.
> * The correlation between representation and the actual values is less.
> So, it would be preferable to represent each instance's phases separately.
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