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https://issues.apache.org/jira/browse/SOLR-13875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16961138#comment-16961138
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Erick Erickson commented on SOLR-13875:
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Probably both can be closed by the same fix, let's just make it explicit.
> Check why LBSolrClient thinks it has to sort on _docid_
> -------------------------------------------------------
>
> Key: SOLR-13875
> URL: https://issues.apache.org/jira/browse/SOLR-13875
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Erick Erickson
> Priority: Major
>
> Related to SOLR-13874. LBSolrClient issues a query that sorts on \_docid\_.
> This can take over 12 seconds on a 1B doc replica. Is the sorting necessary
> at all? If it's removed, what are the effects on performance? Of we change
> SOLR-13874, we can close this.
> Frankly I suspect that no matter what, there have to be over 1B comparisons
> done and that's what's taking the time, but I wanted to call this out
> explicitly.
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