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From Jan Høydahl (JIRA) <>
Subject [jira] [Updated] (SOLR-10147) Admin UI -> Cloud -> Graph: Impossible to see shard state
Date Mon, 20 Feb 2017 19:13:44 GMT


Jan Høydahl updated SOLR-10147:
    Attachment: color_and_style.png

I'm not sure it is even important to distinguish between various states of an inactive shard/replica?
We could use _italics_ or *bold*, or even -strikethrough- in order to not being dependent
on colors. BTW, it is bad practice to rely on colors only, ref color blind people or if you
print the page on a B/W printer :-)

So to try to improve on the existing colors as well, what if we create a scheme with combinations
of color and style, here is an attempt where we use bold to signify Leader, italic to mean
recovering, strike-through means down or inactive, while double strikethrough means Gone.
See screen shot:

> Admin UI -> Cloud -> Graph: Impossible to see shard state
> ---------------------------------------------------------
>                 Key: SOLR-10147
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Admin UI
>            Reporter: Jan Høydahl
>         Attachments: color_and_style.png, screenshot-1.png, SOLR-10147.patch, SOLR-10147.patch
> Currently in the Cloud -> Graph view there is a legend with color codes, but that
is for replicas only.
> We need a way to quickly see the state of the shard, in particular if it is active or
inactive. For testing, create a collection, then call SPLITSHARD on shard1, and you'll end
up with shards {{shard1}}, {{shard1_0}} and {{shard1_1}}. It is not possible to see which
one is active or inactive.
> Also, the replicas belonging to the inactive shard are still marked with green "Active",
while in reality they are "Inactive".
> The simplest would be to add a new state "Inactive" with color e.g. blue, which would
be used on both shard and replica level. But since an inactive replica could also be "Gone"
or "Down", there should be some way to indicate both at the same time...

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