[jira] [Created] (SOLR-9391) LBHttpSolrClient.request can return incorrect Rsp.server string

["Christine Poerschke (JIRA)" <ji...@apache.org>]

Christine Poerschke created SOLR-9391:
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             Summary: LBHttpSolrClient.request can return incorrect Rsp.server string
                 Key: SOLR-9391
                 URL: https://issues.apache.org/jira/browse/SOLR-9391
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Christine Poerschke
            Assignee: Christine Poerschke
            Priority: Minor
         Attachments: SOLR-9391.patch

Problem:
* [LBHttpSolrClient.request|https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/impl/LBHttpSolrClient.java#L361-L366] assigns to {{rsp.server}} at line 361 and then at line 366 makes a {{doRequest(client, req, rsp, isUpdate, false, null);}} method call.
* If the original {{doRequest}} call(s) did not succeed then later at [line 382|https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/impl/LBHttpSolrClient.java#L382] additional {{doRequest}} calls may happen. These calls could use a different server but currently {{rsp.server}} remains unchanged and thus [LBHttpSolrClient.request|https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/impl/LBHttpSolrClient.java#L331] could return an incorrect {{Rsp.server}} string value.

Proposed fix: 
* Change the [doRequest method|https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/impl/LBHttpSolrClient.java#L409-L413] so that it assigns {{Rsp.server}} alongside the existing {{Rsp.rsp}} assignment.
* Note that since the [HttpSolrClient constructor|https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/impl/HttpSolrClient.java#L190-L199] trims of any trailing {{/}} from the {{baseUrl}} then the proposed fix potentially minutely changes the {{Rsp.getServer()}} return value.
** {{Rsp.getServer()}} is called by [HttpShardHandler.submit|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/handler/component/HttpShardHandler.java#L200] as {{srsp.setShardAddress(rsp.getServer());}}
** I have not fully checked where/how {{getShardAddress()}} is then subsequently used but would very much hope that the removal of a trailing {{/}} would not cause any issues.



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