Taisuke Miyazaki created SOLR-14918:
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Summary: add "failIfEmptyCores" option for HealthCheckHandler
Key: SOLR-14918
URL: https://issues.apache.org/jira/browse/SOLR-14918
Project: Solr
Issue Type: New Feature
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 8.6
Reporter: Taisuke Miyazaki
h2. Background
We are hosting Solr on AWS EC2.
We have set up Solr to start in systemd and create a core at startup. (The
replica type is "pull".)
I manage those EC2 instances in the AWS AutoScaling Group and use TargetGroup
to access Solr via the Application Load Balancer.
For health checks in TargetGroup, we use the requireHealthyCores option using
/api/node/health (henceforth called HealthCheckHandler).
In most cases this is not a problem.
However, this can cause additional problems with a rare core creation failure
issue at startup.
If you use the requireHealthyCores option for HealtchCheckHandler, the status
will be OK if the core is not there in the first place, so the health check
will be OK even though the core is not present (an unusual condition).
h2. Proposal
Therefore, we propose to add an option to set the status to Fail if the core
does not exist. That way, we can make the health check fail even if the core
was not created for some reason.
We believe this option should only work if the requireHealthyCores option is
true.
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