Use Lucene's Field Cache To Retrieve Stored Fields From Memory
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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
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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