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https://issues.apache.org/jira/browse/SOLR-9378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719447#comment-17719447
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Chris M. Hostetter commented on SOLR-9378:
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SOLR-13595 would also be trivially fixed by this change(since ShardsAugmenter 
would no longer depend on the {{shard.url}} param

> Avoid sending the shard.url parameter in shard requests
> -------------------------------------------------------
>
>                 Key: SOLR-9378
>                 URL: https://issues.apache.org/jira/browse/SOLR-9378
>             Project: Solr
>          Issue Type: Improvement
>          Components: search, SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Priority: Minor
>             Fix For: 6.2, 7.0
>
>
> The shard.url parameter contains a list of all replicas for a shard. One of 
> those is chosen by the HttpShardHandler to execute the request. So, it is 
> used only within the context of processing request on a distributor node as a 
> special storage for a list of replicas urls between the prep and execution 
> phase of HttpShardHandler. There is no real need to send this parameter down 
> to the chosen shard.
> However, Hoss pointed out to me that removing this would break 
> ShardAugmenterFactory so we need to figure out if/how we can do this. 
> Personally, I don't think it is at all useful to write down ​*all*​ replicas 
> with the document without telling which replica really served the query.



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