Tom Burton-West created SOLR-6560:
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Summary: Solr example file has outdated termIndexInterval entry
Key: SOLR-6560
URL: https://issues.apache.org/jira/browse/SOLR-6560
Project: Solr
Issue Type: Bug
Components: documentation
Affects Versions: 4.10
Reporter: Tom Burton-West
Priority: Minor
The termIndexInterval comment and example settings in the example
solrconfig.xml file is left over from Solr 3.x versions. It does not apply to
the default Solr 4.x installation and its presence in the example is
confusing.
According to the JavaDocs for IndexWriterConfig, the Lucene level
implementations of setTermIndexInterval and setReaderTermsIndexDivisor these do
not apply to the default Solr4 PostingsFormat implementation.
>From
>(http://lucene.apache.org/core/4_10_0/core/org/apache/lucene/index/IndexWriterConfig.html#setTermIndexInterval%28int%29
> )
"This parameter does not apply to all PostingsFormat implementations, including
the default one in this release. It only makes sense for term indexes that are
implemented as a fixed gap between terms. For example, Lucene41PostingsFormat
implements the term index instead based upon how terms share prefixes. To
configure its parameters (the minimum and maximum size for a block), you would
instead use Lucene41PostingsFormat.Lucene41PostingsFormat(int, int). which can
also be configured on a per-field basis:"
The (soon to be ) attached patch just removes the outdated example.
Documentation on the wiki and Solr ref guide should also be updated.
If the latest Solr default postings format can be configured from Solr, perhaps
someone with knowledge of the use case and experience configuring it could
provide a suitable example. Since the Solr 4 default postingsformat is so
much more efficient than Solr 3.x, there might no longer be a use case for
messing with the parameters.
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