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https://issues.apache.org/jira/browse/SOLR-6816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14233732#comment-14233732
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Timothy Potter commented on SOLR-6816:
--------------------------------------

bq. Did you see any improvements with any of those changes though?

I did see some improvements, but now I'm fighting with the opposite problem, 
namely, with pollQueueTime > 0, the docs get buffered (in the runner) a little 
too long now because the queue always has another request on it, so now I'm 
experimenting with a maxPending concept, which attempts to flush the buffer out 
to the replica if docs have been piling up for too long in the runner.

> 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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