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https://issues.apache.org/jira/browse/SOLR-15758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17437371#comment-17437371
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Christine Poerschke commented on SOLR-15758:
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If one increases {{numRecordsToKeep}} above the {{100}} default then
intuitively it would seem logical that {{numDeletesToKeep}} and
{{numDeletesByQueryToKeep}} might need to increase too, though I don't (yet)
have a fully conclusive narrative as to why (other than that the default
{{numRecordsToKeep}} matches hard-coded {{numDeletesByQueryToKeep}} value) and
when/how exactly non-increasing could manifest in issues.
> in UpdateLog allow numDeletes[ByQuery]ToKeep customisation
> ----------------------------------------------------------
>
> Key: SOLR-15758
> URL: https://issues.apache.org/jira/browse/SOLR-15758
> Project: Solr
> Issue Type: Task
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Minor
>
> {{numRecordsToKeep}} and {{maxNumLogsToKeep}} are customisable since
> SOLR-6359 and default to {{100}} and {{10}} respectively:
> [https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.10.1/solr/core/src/java/org/apache/solr/update/UpdateLog.java#L343-L344]
> {{numDeletesToKeep}} and {{numDeletesByQueryToKeep}} are currently hard-coded
> to {{1000}} and {{100}} respectively:
> [https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.10.1/solr/core/src/java/org/apache/solr/update/UpdateLog.java#L204-L205]
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