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https://issues.apache.org/jira/browse/SOLR-14865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17196285#comment-17196285
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Christine Poerschke commented on SOLR-14865:
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{quote}... the {{indexConfig}} section can be inspected but when doing so the
{{metrics}} content does not appear to be correctly reflected ...
{quote}
I've been looking into this some more today and it appears that the
{{<majorMergeDocs>16</majorMergeDocs>}} is actually not being correctly read
i.e. the {{// :NOTE: Unexpected Node names are ignored}} scenario at
[https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.6.2/solr/core/src/java/org/apache/solr/util/DOMUtil.java#L179]
applies and {{<long name="majorMergeDocs">16</long>}} is the required usage
(though {{<int name="majorMergeDocs">16</int>}} would also work).
Have added an additional edit to the
[https://github.com/apache/lucene-solr/pull/1870] pull request.
[~ab], would you have a chance perhaps to double-check my analysis here? Thanks!
> clarify index merge metrics configuration documentation
> -------------------------------------------------------
>
> Key: SOLR-14865
> URL: https://issues.apache.org/jira/browse/SOLR-14865
> Project: Solr
> Issue Type: Task
> Components: metrics
> Reporter: Christine Poerschke
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The documentation – e.g.
> [https://lucene.apache.org/solr/guide/8_6/metrics-reporting.html#index-merge-metrics]
> – currently mentions that _"Basic metrics are always collected"_ but
> experimentally and from a quick look at the code – e.g.
> [https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.6.2/solr/core/src/java/org/apache/solr/update/SolrIndexWriter.java#L146]
> – it appears that a {{metrics}} element needs to be configured and that it
> needs to have either a {{merge}} or a {{mergeDetails}} element configured as
> true.
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