Chris M. Hostetter created SOLR-16089:
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Summary: DOWN replica causes missing data on Cloud>Nodes admin ui
screen for unrelated nodes
Key: SOLR-16089
URL: https://issues.apache.org/jira/browse/SOLR-16089
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: Admin UI
Reporter: Chris M. Hostetter
If a node is {{{}/live_nodes{}}}, but a replica hosted on that node is {{DOWN}}
( or missing from the Metrics API response section for that node for any other
reason) this breaks a brittle assumption in the {{cloud.js}} logic that
generates the data structure used to power the {{/solr/#/~cloud?view=nodes}}
The current assumption is that _any_ replica found in the {{CLUSTERSTATUS}}
response, hosted on a live_node, will be found in the Metrics API response --
when this is not true, the javascript throws a {{TypeError}} while looping over
the metrics API response, leaving the datastructure it was building incomplete.
This means that, depending on _where_ in the (effectively) random order that
the metrics API returns node details, all or some of the nodes visible on the
resulting admin UI screen will be missing data from the metrics API (most
notably in the Disk Usage column) depending on whether they came "after" the
node hosting the problematic replica.
There is nothing obvious in the UI to indicate that a particular node/replica
is having a problem -- making it particularly hard to identify why columns like
Disk Usage are "blank"
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