Keith Laban created SOLR-8666:
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Summary: Add header to SearchHandler to indicate whether solr is
connection to zk
Key: SOLR-8666
URL: https://issues.apache.org/jira/browse/SOLR-8666
Project: Solr
Issue Type: Improvement
Reporter: Keith Laban
Currently solr update requests error out if a zookeeper check fails, however
SearchHandler does not do these checks. As a result, if a request is sent to a
node which should be part of a SolrCloud but is not connected to zookeeper and
thinks that its Active, it's possible the response is composed of stale data.
The purpose of this header is to allow the client to decide whether or not the
result data should be considered valid.
This patch also returns the {{zkConnected}} header in the ping handler to allow
external health checks to use this information.
See [SOLR-8599] for an example of when this situation can arise.
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