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Posted to dev@lucene.apache.org by "Mikhail Khludnev (JIRA)" <ji...@apache.org> on 2018/01/24 06:21:00 UTC
[jira] [Commented] (SOLR-11891) BinaryResponseWriter fetches
unnecessary fields
[ https://issues.apache.org/jira/browse/SOLR-11891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16336996#comment-16336996 ]
Mikhail Khludnev commented on SOLR-11891:
-----------------------------------------
I believe that after [Document doc = docFetcher.doc(id, fnames);|[https://github.com/apache/lucene-solr/blob/df874432b9a17b547acb24a01d3491839e6a6b69/solr/core/src/java/org/apache/solr/response/DocsStreamer.java#L155]] Lucene's Document contains only the requested fields.
I'm not sure but this can be related somehow, when result [transformer] is used it may refer to any field, so it might impact fl filtering, also some remaining wildcard param {{fl=*}} might trigger full loading.
> BinaryResponseWriter fetches unnecessary fields
> -----------------------------------------------
>
> Key: SOLR-11891
> URL: https://issues.apache.org/jira/browse/SOLR-11891
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Response Writers
> Affects Versions: 5.4, 6.4.2, 6.6.2
> Reporter: wei wang
> Priority: Major
>
> We observe that solr query time increases significantly with the number of rows requested, even all we retrieve for each document is just fl=id,score. Debugged a bit and see that most of the increased time was spent in BinaryResponseWriter, converting lucene document into SolrDocument. Inside convertLuceneDocToSolrDoc():
> [https://github.com/apache/lucene-solr/blob/df874432b9a17b547acb24a01d3491839e6a6b69/solr/core/src/java/org/apache/solr/response/DocsStreamer.java#L182]
> I am a bit puzzled why we need to iterate through all the fields in the document. Why can’t we just iterate through the requested field list?
> [https://github.com/apache/lucene-solr/blob/df874432b9a17b547acb24a01d3491839e6a6b69/solr/core/src/java/org/apache/solr/response/DocsStreamer.java#L156]
> e.g. when pass in the field list as
> sdoc = convertLuceneDocToSolrDoc(doc, rctx.getSearcher().getSchema(), fnames)
> and just iterate through fnames, there is a significant performance boost in our case.
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