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https://issues.apache.org/jira/browse/SOLR-10114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861377#comment-15861377
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Mano Kovacs commented on SOLR-10114:
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[~yo...@apache.org], confirmed by running parallel insert/updates and deletes
of documents with child documents. Replication gets out of sync eventually.
> child documents lack _version_, susceptible to reordered delete-by-query
> -------------------------------------------------------------------------
>
> Key: SOLR-10114
> URL: https://issues.apache.org/jira/browse/SOLR-10114
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Yonik Seeley
>
> It looks like when a block of documents is indexed, child documents get no
> \_version\_ field. This means (among other potential issues) that a
> delete-by-query that is reordered will cause matching child documents to be
> deleted. DBQ normally prevents deleting newer docs by including a
> restriction on \_version\_, which doesn't work for anything lacking that
> field. Re-ordered delete-by-term of any child docs would also be affected
> (although it should be a much rarer issue.)
> The leading candidate for a fix is to use the exact same \_version\_ for all
> child docs.
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