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https://issues.apache.org/jira/browse/LUCENE-7397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396812#comment-15396812
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donghyun Kim commented on LUCENE-7397:
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I think it's better to reuse read termVector when each document x many
highlight field search.
eg)
1. each document indexed as many fields.
2. search for document.
3. I want get highlight fragments for many docs each.
for each doc that searched
for each field that I want to get highlight fragment
4. I may call [getBestFragments] method that takes IndexReader, docId.
5. execute [final Fields vectors = reader.getTermVectors(docId);]. and
I think It's possibly slow depends on size of termVector
we may read termvector once per doc highlight process outer elsewhere and pass
(Fields Object) as param I think.
overloading the method possibly can solve my problem.
my scenario is :
for each doc that searched
execute [final Fields vectors = reader.getTermVectors(docId);]. and I think
It's possibly slow depends on size of
for each field that I want to get highlight fragment
I may call [getBestFragments] method that takes IndexReader, docId,
(Fields vectors).
Any reason to reader.getTermVectors(docId) must located inside each
getBestFragment?
> Inefficient FVhighlighting when set many HighlightedField.
> ----------------------------------------------------------
>
> Key: LUCENE-7397
> URL: https://issues.apache.org/jira/browse/LUCENE-7397
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/highlighter
> Environment: CentOS release 6.4 (Final)
> quad core 1.87
> 8gb memory
> tested Elasticsearch - 1.5 with lucene 4.10.4
> But i see mirrored Master version in github
> https://github.com/apache/lucene-solr
> Reporter: donghyun Kim
> Priority: Minor
>
> when highlighting, search result
> org.apache.lucene.search.vectorhighlight.FastVectorHighlighter.java
> getBestFragment method ~ FieldTermStack.java read whole doc's termvector
> every highlighted field.
> It causes slow query when many highlight field
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