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https://issues.apache.org/jira/browse/SOLR-6816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14233720#comment-14233720
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Mark Miller commented on SOLR-6816:
-----------------------------------

bq. then sent in mini-batches to replicas

I think we may have discussed this before. I think it's because we don't poll 
on the queue for any amount of time - due to it's cost on single update per 
request stuff. It would be ideal if we could tell if we were in a batch or not, 
and if it is a batch, perhaps we still poll 50 or 100ms.

> Review SolrCloud Indexing Performance.
> --------------------------------------
>
>                 Key: SOLR-6816
>                 URL: https://issues.apache.org/jira/browse/SOLR-6816
>             Project: Solr
>          Issue Type: Task
>          Components: SolrCloud
>            Reporter: Mark Miller
>            Priority: Critical
>         Attachments: SolrBench.pdf
>
>
> We have never really focused on indexing performance, just correctness and 
> low hanging fruit. We need to vet the performance and try to address any 
> holes.
> Note: A common report is that adding any replication is very slow.



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