Andrzej Bialecki created SOLR-12438:
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Summary: Improve status reporting of metrics history API
Key: SOLR-12438
URL: https://issues.apache.org/jira/browse/SOLR-12438
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: metrics
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
Fix For: 7.4, master (8.0)
In an offline conversation with [~janhoy] we identified the following areas of
improvement to the metrics history API in order to increase its
user-friendliness and provide more details about its status.
* there are three possible states for the API: inactive (when not in cloud
mode), in-memory only (when {{.system}} collection doesn’t exist), and
persisted when it’s both active and persisted in Solr. The
/admin/metrics/history endpoint should give some hint about this status, such
as "mode":"memory/index", "active": true|false. Or a separate action=status
just to poll status? Currently when the API is inactive it simply returns 404
Not Found.
* when in "memory" mode a call to /admin/metrics/history on a non-overseer node
should forward the request to the overseer, so that the client does not need to
care what mode it is in - kind of like how a query works in distributed mode.
* better documentation for the API behavior in each mode.
* perhaps if mode=memory, there could also be a "message":"Warning, metrics
history is not being persisted. Please create the .system collection to start
persisting history"
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