[jira] [Created] (SOLR-9357) ConcurrentUpdateSolrClient does not retry sending docs to followers

["Erick Erickson (JIRA)" <ji...@apache.org>]

Erick Erickson created SOLR-9357:
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             Summary: ConcurrentUpdateSolrClient does not retry sending docs to followers
                 Key: SOLR-9357
                 URL: https://issues.apache.org/jira/browse/SOLR-9357
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 6.x, 5.3
            Reporter: Erick Erickson


I'm a little out of my comfort zone, so posting this for discussion. If, for any reason, ConcurrentUpdateSolrClient doesn't get a response from a replica (say a network glitch or the like), it _seems_ to initiate a LIR on the replica. This is around line 243 in 5.3.2, and the corresponding code in 6x looks unchanged on a quick perusal.

This is fragile in the sense that a simple retry could avoid the replica going into recovery if the problem is transient.

I don't think this is issuing a retry higher in the stack, but we're seeing this behavior in the field so I'm posting this here for discussion, I've had a back-channel discussion already so a JIRA seems in order.

The other thing I'm not entirely sure of is whether retrying at this point in the process is something that will avoid versioning problems, although I believe the docs already have a version stamp so it should be OK.



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