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https://issues.apache.org/jira/browse/LUCENE-2810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970892#action_12970892
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Grant Ingersoll commented on LUCENE-2810:
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bq. Other libraries likely provide this support better than we ever could, for
lucene i think the focus shouldn't have anything to do with data redundancy in
particular but just making the storage API in general so that everyone's needs
are met, not just your log file needs.
Totally agree. I haven't talked too much on implementation yet. Perhaps this
alternate implementation is merely to bake in, via a contrib/module, one of
these libraries underneath the hood. As with all of this, documentation is the
key.
This isn't just limited to log file needs, though, although that is probably
one of the most extreme use cases where an alternate storage mechanism would be
beneficial.
> Explore Alternate Stored Field approaches for highly redundant data
> -------------------------------------------------------------------
>
> 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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