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https://issues.apache.org/jira/browse/SOLR-8012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14732188#comment-14732188
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Shalin Shekhar Mangar commented on SOLR-8012:
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I believe Chirag is suggesting that only the field mapping portion of the fl
parameter not be sent over the network to each shard and handled entirely on
the merger node. The actual field names to be fetched would still be sent to
each shard.
> Field mapping portion of "fl" should be handled in the merger node
> ------------------------------------------------------------------
>
> Key: SOLR-8012
> URL: https://issues.apache.org/jira/browse/SOLR-8012
> Project: Solr
> Issue Type: Improvement
> Components: search, SearchComponents - other, SolrCloud
> Affects Versions: 5.1
> Reporter: Chirag Gupta
> Labels: starter
>
> Today "fl" is used for
> a) filtering the fields and
> b) mapping the field names to alternate names.
> we should optimize the network traffic by not passing the field mappings to
> all the nodes and run on the node which is fanning-out and merging the
> request.
> This impacts the network in the cases where there are 100s of shards to send
> and the field mapping list is huge
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