[jira] [Updated] (SOLR-9974) Use Suffix Arrays for fast search with leading asterisks

["Yakov Sirotkin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-9974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yakov Sirotkin updated SOLR-9974:
---------------------------------
    Attachment: suffix-array.patch

> Use Suffix Arrays for fast search with leading asterisks
> --------------------------------------------------------
>
>                 Key: SOLR-9974
>                 URL: https://issues.apache.org/jira/browse/SOLR-9974
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Yakov Sirotkin
>         Attachments: suffix-array.patch
>
>
> If query term starts with asterisks FST checks all words in the dictionary so request processing speed falls down. This problem can be solved with Suffix Array approach. Luckily, Suffix Array can be constructed after Lucene start from existing index. Unfortunately, Suffix Arrays requires a lot of RAM so we can use it only when special flag is set:
> -Dsolr.suffixArray.enable=true
> It is possible to  speed up Suffix Array initialization using several threads, so we can control number of threads with 
> -Dsolr.suffixArray.initialization_treads_count=5
> This system property can be omitted, the default value is 5.  
> Attached patch is the suggested implementation for SuffixArray support, it works for all terms starting with asterisks with at least 3 consequent non-wildcard characters. This patch do not change search results and  affects only performance issues.



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