[jira] [Closed] (SOLR-10993) lots of empty highlight entries

["Alexandre Rafalovitch (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-10993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexandre Rafalovitch closed SOLR-10993.
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> lots of empty highlight entries
> -------------------------------
>
>                 Key: SOLR-10993
>                 URL: https://issues.apache.org/jira/browse/SOLR-10993
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: highlighter
>    Affects Versions: 6.6
>            Reporter: Christoph Hack
>            Priority: Major
>
> I have indexed documents with lots of different text fields representing different properties in Solr (version 6.6). Those text fields are indexed with storeOffsetsWithPositions=true and termVectors=true to speed up highlighting using the UnifiedHighlighter.
> During a search, i would like to highlight those properties and I have set hl.fl to wildcard match all properties. Everything is working fine, except that the responses are huge.
> Every document only has a small set of properties (let's say 10 in total, with 1-2 matching ones), but Solr returns in the highlighting section, a dictionary with every possible property (about 10k) for every item. Nearly all of the entries are empty, but decoding the keys of the map takes a considerable amount of time.
> In fact, the time spent decoding this unnecessary entries is enormous. Solr takes about 174ms for the search + encoding (i expect that the timing could be much better) and decoding the response in Go (using the default JSON package from the standard library) takes 695ms.
> I guess the offending line is somewhere around:
> https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/highlight/UnifiedSolrHighlighter.java#L175
> Why is Solr generating map entries for missing values in the first place?
> The question had been posted on stackoverflow before:
> https://stackoverflow.com/questions/44846220/solr-huge-and-slow-highlighting-response-with-mostly-empty-fields



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