[jira] [Created] (SOLR-16089) DOWN replica causes missing data on Cloud>Nodes admin ui screen for unrelated nodes

["Chris M. Hostetter (Jira)" <ji...@apache.org>]

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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