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https://issues.apache.org/jira/browse/SOLR-6035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13985704#comment-13985704
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Mark Miller commented on SOLR-6035:
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Interesting - that may explain some earlier reports.
> CloudSolrServer directUpdate routing should use getCoreUrl
> -----------------------------------------------------------
>
> Key: SOLR-6035
> URL: https://issues.apache.org/jira/browse/SOLR-6035
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Marvin Justice
> Priority: Minor
> Labels: performance
> Attachments: SOLR-6035.patch
>
>
> In a multisharded node environment we were seeing forward-to-leader hops when
> using CloudSolrServer directUpdate (with the hop being on the same node) .
> Consequently, there was no improvement in indexing performance over
> non-directUpdate.
> Changing buildUrlMap to use getCoreUrl eliminated the extra hop and now we
> see a dramatic improvement in performance.
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