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https://issues.apache.org/jira/browse/SOLR-9592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15547449#comment-15547449
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Takahiro Ishikawa commented on SOLR-9592:
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bq. I supposed weakly agree
Thank you. I'll keep it(getLeafReader) renamed :)
{quote}
Right. Sometimes you need both a global view and a segment view to do it right.
See something like FacetFieldProcessorByArrayDV, where we use both top level
and segment level.
{quote}
Yes, I got what you are saying. If I have a time, I'll go into detail for
MultiDocValues problem.
Now all my work is done. Is there any other comments?
> decorateDocValues cause serious performance issue because of using
> slowCompositeReaderWrapper
> ---------------------------------------------------------------------------------------------
>
> Key: SOLR-9592
> URL: https://issues.apache.org/jira/browse/SOLR-9592
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Response Writers, search
> Affects Versions: 6.0, 6.1, 6.2
> Reporter: Takahiro Ishikawa
> Labels: performance
> Fix For: 6.3, master (7.0)
>
> Attachments: SOLR-9592.patch, SOLR-9592.patch, SOLR-9592_6x.patch
>
>
> I have serious performance issue using AtomicUpdate (and RealtimeGet) with
> non stored docValues.
> Because decorateDocValues try to merge each leafLeader on the fly via
> slowCompositeReaderWrapper and it’s extremely slow (> 10sec).
> Simply access docValues via nonCompositeReader could resolve this
> issue.(patch)
> AtomicUpdate performance(or RealtimeGet performance)
> * Environment
> ** solr version : 6.0.0
> ** schema ~ 100 fields(90% docValues, some of those are multi valued)
> ** index : 5,000,000
> * Performance
> ** original : > 10sec per query
> ** patched : at least 100msec per query
> This patch will also enhance search performance, because DocStreamer also
> fetch docValues via decorateDocValues.
> Though it depends on each environment, I could take 20% search performance
> gain.
> (This patch originally written for solr 6.0.0, and now rewritten for master)
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