[jira] [Created] (SOLR-12868) Request forwarding for v2 API is broken

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

Shalin Shekhar Mangar created SOLR-12868:
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             Summary: Request forwarding for v2 API is broken
                 Key: SOLR-12868
                 URL: https://issues.apache.org/jira/browse/SOLR-12868
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud, v2 API
            Reporter: Shalin Shekhar Mangar
             Fix For: 7.6, master (8.0)


I was working with Noble Paul to investigate test failures seen in SOLR-12806 where we found this issue. Due to a bug, replicas of a collection weren't spread evenly so there were some nodes which did not have any replicas at all. In such cases, when a v2 API call hits an empty node, it is not forwarded to the right path on the remote node causing test failures.

e.g. a call to {{/c/collection/_introspect}} is forwarded as {{http://127.0.0.1:63326/solr/collection1/_introspect?method=POST&wt=javabin&version=2&command=XXXX}} and {{/c/collection1/abccdef}} is forwarded as {{http://127.0.0.1:63326/solr/collection1/abccdef}}

In summary, a remote query for v2 API from an empty node is converted to a v1 style call which may not be a valid path. We should forward v2 API calls as-is without changing the paths.



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