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https://issues.apache.org/jira/browse/SOLR-9447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15447712#comment-15447712
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David Smiley commented on SOLR-9447:
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+1. Say why was it cloning it twice?
> Do not clone SolrInputDocument if update processor chain does not contain
> custom processors
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-9447
> URL: https://issues.apache.org/jira/browse/SOLR-9447
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Shalin Shekhar Mangar
> Fix For: master (7.0), 6.3
>
> Attachments: SOLR-9447.patch
>
>
> In SOLR-3215 we started cloning documents before adding them locally and send
> the cloned copy to replicas. This was done because processors after
> DistributedUpdateProcessor can affect the docs before they are sent to the
> replicas.
> However, we can avoid the deep copy if we know for sure that the processors
> after DUP are one of (LogUpdateProcessor, RunUpdateProcessor,
> TolerantUpdateProcessor) which definitely do not modify the document. This
> ensures that the common case is optimized.
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