Hello,
We are experiencing an issue with our Solr 9.4.0 collection, which has a few
hundred shards and is deployed on Kubernetes using the Solr operator. We have
configured coordinators for our setup.
When we send a request through the `/select` request handler via the
coordinators, it is distributed as expected. The logs show activity from both
the coordinator that received the request and the replicas of that collection,
with the request ID (rid) based on the coordinator.
However, we use custom request handlers in our collection (configured in
`solrconfig.xml`). Whenever we send a request through one of these custom
handlers, the request is not federated by the coordinator. No log entry is
written in the coordinator pod, and the rid is based on one of the data
replicas instead.
This issue prevents us from benefiting fully from using coordinators, which is
important for our setup. However, we do not want to limit ourselves only to
`/select` and lose out on the customization options.
Are we doing something wrong? What can we do to fix this?
Upon investigation, we found the following code in `CoordinatorV2HttpSolrCall`
lines 43-49:
protected SolrCore getCoreByCollection(String collectionName, boolean
isPreferLeader) {
this.collectionName = collectionName;
SolrCore core = super.getCoreByCollection(collectionName, isPreferLeader);
if (core != null) return core;
if (!path.endsWith("/select")) return null;
return CoordinatorHttpSolrCall.getCore(factory, this, collectionName,
isPreferLeader);
}
We suspect that this is the reason why custom request handlers are not being
distributed properly.
We tested this by changing one of our custom request handler names from
`/costume` to `/costume/select`, and to our dismay, it was distributed
properly. While this is a workaround, it is not a practical solution for us.
Renaming everything and replacing it throughout every client in our
organization seems arduous and frankly, a bit unreasonable.
We would appreciate any advice or suggestions on how to address this issue.
Thank you in advance for your help.
Best regards,
Ella
