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https://issues.apache.org/jira/browse/SOLR-18194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SOLR-18194:
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Labels: pull-request-available (was: )
> Handle Updated Documents in UpgradeCoreIndex Child Doc Check
> ------------------------------------------------------------
>
> Key: SOLR-18194
> URL: https://issues.apache.org/jira/browse/SOLR-18194
> Project: Solr
> Issue Type: Improvement
> Reporter: Lucas Kot-Zaniewski
> Assignee: Lucas Kot-Zaniewski
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The child doc check in UpgradeCoreIndex compares the docCount with the terms
> size of the {{\_root\_}} field with the intention that if there are more
> Lucene documents than unique values (equivalent to the size of terms) then
> some Lucene documents share a {{\_root\_}}. Nominally this is true, however
> in case of document updates a single _Solr_ document can be written to the
> _same_ segment if they are in the _same_ commit window. In this case the
> (Lucene) docCount will exceed the terms size of {{\_root\_}} even though none
> of the documents have children. A better check would be to explicitly compare
> this with the count of Solr documents. Owing to the cycle-free relationship
> of {{\_root\_}} we know that if the count of distinct Solr documents equals
> the distinct values of {{\_root\_}} then we have no child docs. We can
> implement this by looking at the distinct values of Solr's unique key field.
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