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From "Curtis Schneider (JIRA)" <>
Subject [jira] [Commented] (SOLR-5405) Cloud graph view not usable by color-blind users - request small tweak
Date Thu, 27 Apr 2017 17:52:04 GMT


Curtis Schneider commented on SOLR-5405:

Hello all,

I'm a Solr user with mild to moderate color blindness, both red-green and blue-yellow.  I
can't trust my vision to make use of the Cloud Graph admin page in Solr, I end up asking a
co-worker to point out anything that isn't green or using Chrome's Inspect Element tool to
read the class names for each of the nodes.  @Nathan: I have not noticed anywhere else in
the Admin UI that this is a problem, for me.

A few notes:

The text for each of the nodes is very fine.  There simply aren't enough pixels for me to
be able to determine what color is being displayed.

The color palette used is low in contrast.  As a fallback I can sometimes use contrast in
shades when ability to discern color fails.  I am unable to do this with the color palette
used for the Cloud Graph page.

What works for one color blind user may not work for another color blind user.  Depending
on severity and type of color blindness, a color palette that works for some may be of no
benefit to others.

A potential solution:
Color is a valuable tool to quickly display information to users but it doesn't work for everyone.
 Adding a second dimension to the key would benefit all users, not just the color blind. 
A common solution is to use shapes.  Shape representations for "Active", "Recovering", "Down",
"Recovery Failed", and "Gone" could be filled by Square, Diamond, Triangle, Circle, and "X".
 This would still allow use of dark fill to identify Leaders.

Adding the text representation of the state after each node IP is another option but may clutter
the display in larger Solr clusters.

Thanks in advance for any time put toward a resolution,

> Cloud graph view not usable by color-blind users - request small tweak
> ----------------------------------------------------------------------
>                 Key: SOLR-5405
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: Admin UI
>    Affects Versions: 4.5
>            Reporter: Nathan Neulinger
>            Assignee: Stefan Matheis (steffkes)
>              Labels: accessibility
> Currently, the cloud view status is impossible to see easily on the graph screen if you
are color blind. (On of my coworkers.)
> Would it be possible to put " (X)" after the IP of the node where X is [LARDFG] for the

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