David Smiley created SOLR-18131:
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Summary: SolrCloud should return HTTP header(s) of certain ZK node
versions
Key: SOLR-18131
URL: https://issues.apache.org/jira/browse/SOLR-18131
Project: Solr
Issue Type: Sub-task
Reporter: David Smiley
(see parent issue) Solr should return an HTTP header of some ZK Stat version
numbers of pertinent ZK nodes. Relates to ClusterState tracking. This enables
a client to invalidate a cache of related information (perhaps CloudSolrClient
/ HttpClusterStateProvider) or similar for custom clients not using SolrJ.
It could be JSON to hold multiple, or we use multiple headers. Need to decide
on suitable name(s).
All SolrCloud interaction can use this:
live_nodes: ZK cversion (initial 'c' is for children)
Interactions involving one (typical) or more collections can incorporate:
collectionName: ZK version
Interactions involving alias resolution can incorporate:
aliases: ZK version
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