Stored Fields Compression
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Key: LUCENE-2810
URL: https://issues.apache.org/jira/browse/LUCENE-2810
Project: Lucene - Java
Issue Type: Improvement
Components: Store
Reporter: Grant Ingersoll
Assignee: Grant Ingersoll
In some cases (logs, HTML pages w/ boilerplate, etc.), the stored fields for
documents contain a lot of redundant information and end up wasting a lot of
space across a large collection of documents. For instance, simply compressing
a typical log file often results in > 75% compression rates. We should explore
mechanisms for applying compression across all the documents for a field (or
fields) while still maintaining relatively fast lookup (that being said, in
most logging applications, fast retrieval of a given event is not always
critical.) For instance, perhaps it is possible to have a part of storage that
contains the set of unique values for all the fields and the document field
value simply contains a reference (could be as small as a few bits depending on
the number of uniq. items) to that value instead of having a full copy.
Extending this, perhaps we can leverage some existing compression capabilities
in Java to provide this as well.
It may make sense to implement this as a Directory, but it might also make
sense as a Codec, if and when we have support for changing storage Codecs.
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