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https://issues.apache.org/jira/browse/SOLR-1961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephen Bochinski updated SOLR-1961:
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Attachment: patch.txt
code changes.
> Use Lucene's Field Cache To Retrieve Stored Fields From Memory
> --------------------------------------------------------------
>
> Key: SOLR-1961
> URL: https://issues.apache.org/jira/browse/SOLR-1961
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.4
> Reporter: Stephen Bochinski
> Attachments: patch.txt
>
> Original Estimate: 101.5h
> Remaining Estimate: 101.5h
>
> This allows the user to configure which fields should be field cached in the
> schema.xml file by adding the following attribute:
> fieldCached="true"
> Enabling this on a field greatly decreases the time needed to retrieve stored
> fields. This works on fields containing Bytes, Strings, Integers, Longs, and
> Floats. Enabling field cache is applicable in many scenarios. For instance,
> if you have a bunch of text that is indexed and not stored and you only need
> to retrieve a string or number associated with a document. Its applicable in
> any case where there are many indexed fields and not too many stored fields
> being retrieved. The memory consumption is not very high compared to the
> performance gains field cache brings.
> Memory consumption is governed by: Number of fields cached * Number of
> documents * 8 bytes per reference +
> SUM(Number of unique values of the field * average length of term)
> * 2 (chars use 2 bytes) * String overhead (40 bytes)
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