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https://issues.apache.org/jira/browse/SOLR-12868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gerlowski resolved SOLR-12868.
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Resolution: Fixed
> Request forwarding for v2 API is broken
> ---------------------------------------
>
> Key: SOLR-12868
> URL: https://issues.apache.org/jira/browse/SOLR-12868
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud, v2 API
> Reporter: Shalin Shekhar Mangar
> Assignee: Noble Paul
> Priority: Major
> Fix For: 7.6
>
>
> 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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