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https://issues.apache.org/jira/browse/SOLR-12388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16487561#comment-16487561
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Steve Rowe commented on SOLR-12388:
-----------------------------------

bq. I think Steve refers to cluster changes that can happen and a node might 
have missed out on hearing about.

Right.  Solr already handles these conditions, as mentioned in the description, 
via the {{zkConnected}} header.  This issue just enables callers to get a 
failure response instead of having to conditionally handle responses based on 
the value of the {{zkConnected}} header.


> Enable a strict ZooKeeper-connected search request mode, in which search 
> requests will fail when the coordinating node can't communicate with ZooKeeper
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-12388
>                 URL: https://issues.apache.org/jira/browse/SOLR-12388
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Steve Rowe
>            Assignee: Steve Rowe
>            Priority: Minor
>         Attachments: SOLR-12388.patch
>
>
> Right now, a Solr node will return the results of a search request even if it 
> cannot communicate with ZooKeeper at the time it receives the request. This 
> may result in stale or incorrect results if there have been major changes to 
> the collection structure that the node has not been informed of via 
> ZooKeeper.  When this happens, as long as all known shards respond, the 
> response will succeed, and a {{zkConnected}} header set to {{false}} is 
> included in the search response.
> There should be an option to instead fail requests under these conditions, to 
> prevent stale or incorrect results.



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