Bram Van Dam created SOLR-13136:
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             Summary: Queries fail during shard creation [testcase included]
                 Key: SOLR-13136
                 URL: https://issues.apache.org/jira/browse/SOLR-13136
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 7.6
            Reporter: Bram Van Dam
         Attachments: TestSearchDuringShardCreation.java

Shard creation takes a certain amount of time. Queries launched between the 
start of shard creation and the full "upness" of the shard will fail: "Error 
from server at foo: no servers hosting shard: bar".

Ideally, shards should not be used in queries before their creation is fully 
completed. A new shard is empty anyway, so its upness couldn't even influence 
the query results in any way.

I'm attaching a testcase which reproduces the problem. Tested on two machines, 
but your mileage may vary assuming this is a concurrency issue.



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