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https://issues.apache.org/jira/browse/SOLR-6816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14249639#comment-14249639
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Per Steffensen commented on SOLR-6816:
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I believe today overwrite=false will not prevent neither document-version-check
on leader (it will in the Solr we use in my company, but not in Apache Solr)
nor bucket-version-check on non-leaders. As far as I can see
{{DistributedUpdateProcessor.versionAdd}} will do document-version-check if
versionsStored=true, leaderLogic=true and versionOnUpdate != 0. It will do
bucket-version-check if versionsStored=true and leaderLogic=false. This has
nothing to do with overwrite param. This version-check is not only for
add-commands but also for delete-commands.
The overwrite param controls only (in {{DirectUpdateHandler2}}) if you make
sure to delete an existing document with the same id, before you add the new
document. You do that by default, but if overwrite=false you just add the new
document, allowing duplicates (defined to be documents that have the same
id-value).
So as far as I read the code, document-version-check will only be performed on
leaders. Non-leaders will only do bucket-version-check, and I do not think that
is expensive?
As I said our version of Solr does not do document-version-check if
overwrite=false. I think you should introduce that as well. But besides that,
whats left to do in this area?
What did I not understand?
> 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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