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https://issues.apache.org/jira/browse/SOLR-6312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14093983#comment-14093983
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Steve Davids commented on SOLR-6312:
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Yes, I understand that all updates will always go to the leader, the CPU
intensive task in this entire process is running extraction logic using XPaths
in the update processor chain before any requests are distributed to the
leader/replicas. When the request is distributed to the leader, the leader
doesn't need to start the update processor from scratch, instead it continues
where the other machine left off in the processing pipeline at the
DistributedUpdateProcessor. So if I am able to load balance requests to all
replicas the CPU intensive tasks (early update processors) will be shared by
multiple machines not just the leader and should result in increased throughput.
> CloudSolrServer doesn't honor updatesToLeaders constructor argument
> -------------------------------------------------------------------
>
> Key: SOLR-6312
> URL: https://issues.apache.org/jira/browse/SOLR-6312
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.9
> Reporter: Steve Davids
> Fix For: 4.10
>
>
> The CloudSolrServer doesn't use the updatesToLeaders property - all SolrJ
> requests are being sent to the shard leaders.
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