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https://issues.apache.org/jira/browse/SOLR-7333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389653#comment-14389653
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Timothy Potter commented on SOLR-7333:
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Here's the original comment I made about this issue:
https://issues.apache.org/jira/browse/SOLR-6816?focusedCommentId=14233700&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14233700
> Make the poll queue time configurable and use knowledge that a batch is being
> processed to poll efficiently
> -----------------------------------------------------------------------------------------------------------
>
> Key: SOLR-7333
> URL: https://issues.apache.org/jira/browse/SOLR-7333
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Timothy Potter
> Assignee: Timothy Potter
>
> {{StreamingSolrClients}} uses {{ConcurrentUpdateSolrServer}} to stream
> documents from leader to replica, by default it sets the {{pollQueueTime}}
> for CUSS to 0 so that we don't impose an unnecessary wait when processing
> single document updates or the last doc in a batch. However, the downside is
> that replicas receive many more update requests than leaders; I've seen up to
> 40x number of update requests between replica and leader.
> If we're processing a batch of docs, then ideally the poll queue time should
> be greater than 0 up until the last doc is pulled off the queue. If we're
> processing a single doc, then the poll queue time should always be 0 as we
> don't want the thread to wait unnecessarily for another doc that won't come.
> Rather than force indexing applications to provide this optional parameter in
> an update request, it would be better for server-side code that can detect
> whether an update request is a single document or batch of documents to
> override this value internally, i.e. it'll be 0 by default, but since
> {{JavaBinUpdateRequestCodec}} can determine when it's seen the last doc in a
> batch, it can override the pollQueueTime to something greater than 0.
> This means that current indexing clients will see a boost when doing batch
> updates without making any changes on their side.
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