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https://issues.apache.org/jira/browse/SOLR-16989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17769220#comment-17769220
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ASF subversion and git services commented on SOLR-16989:
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Commit dafbe800c2f74086b53269f5b5a62988abadb717 in solr's branch
refs/heads/main from Michael Gibney
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=dafbe800c2f ]
SOLR-16989: Optimize and consolidate reuse of DocValues iterators for value
retrieval (#1938)
> Optimize and consolidate reuse of DocValues iterators for value retrieval
> -------------------------------------------------------------------------
>
> Key: SOLR-16989
> URL: https://issues.apache.org/jira/browse/SOLR-16989
> Project: Solr
> Issue Type: Improvement
> Affects Versions: main (10.0)
> Reporter: Michael Gibney
> Assignee: Michael Gibney
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> DocValues are used for the purpose of arbitrary-order value retrieval mainly
> in two places:
> # {{ExportWriter}} (for the export handler)
> # {{SolrDocumentFetcher}} (for {{useDocValuesAsStored}})
> {{ExportWriter}} holds a simple optimization to reuse docValues iterators
> where possible (i.e., where docId doesn't decrease), but there is no such
> optimization for {{SolrDocumentFetcher}}: for every possible docValues return
> field, for every doc, a new docValues iterator is pulled (and GC'd). This is
> especially pathological in the case of many sparse fields, because the hit is
> incurred regardless of whether the return fields are actually present in any
> returned docs.
> This issue proposes unifying the docValues iterator caching for both these
> contexts, with the most immediate practical effect being improved latency of
> field retrieval for {{useDocValuesAsStored}}.
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