[jira] [Created] (SOLR-12767) Deprecate min_rf

["Tomás Fernández Löbbe (JIRA)" <ji...@apache.org>]

Tomás Fernández Löbbe created SOLR-12767:
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             Summary: Deprecate min_rf
                 Key: SOLR-12767
                 URL: https://issues.apache.org/jira/browse/SOLR-12767
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Tomás Fernández Löbbe


Currently the {{min_rf}} parameter does two things.
1. It tells Solr that the user wants to keep track of the achieved replication factor
2. (undocumented AFAICT) It prevents Solr from putting replicas in recovery if the achieved replication factor is lower than the {{min_rf}} specified

#2 is intentional and I believe the reason behind it is to prevent replicas to go into recovery in cases of short hiccups (since the assumption is that the user is going to retry the request anyway). This is dangerous because if the user doesn’t retry (or retries a number of times but keeps failing) the replicas will be permanently inconsistent. Also, since we now retry updates from leaders to replicas, this behavior has less value, since short temporary blips should be recovered by those retries anyway. 

I think we should remove the behavior described in #2, #1 is still valuable, but there isn’t much point of making the parameter an integer, the user is just telling Solr that they want the achieved replication factor, so it could be a boolean, but I’m thinking we probably don’t even want to expose the parameter, and just always keep track of it, and include it in the response. It’s not costly to calculate, so why keep two separate code paths?



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