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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1426) Next steps towards flexible indexing
Date Mon, 20 Oct 2008 12:39:44 GMT
Next steps towards flexible indexing
------------------------------------

                 Key: LUCENE-1426
                 URL: https://issues.apache.org/jira/browse/LUCENE-1426
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
            Reporter: Michael McCandless
            Assignee: Michael McCandless
            Priority: Minor
             Fix For: 2.9


In working on LUCENE-1410 (PFOR compression) I tried to prototype
switching the postings files to use PFOR instead of vInts for
encoding.

But it quickly became difficult.  EG we currently mux the skip data
into the .frq file, which messes up the int blocks.  We inline
payloads with positions which would also mess up the int blocks.
Skipping offsets and TermInfo offsets hardwire the file pointers of
frq & prox files yet I need to change these to block + offset, etc.

Separately this thread also started up, on how to customize how Lucene
stores positional information in the index:

  http://www.gossamer-threads.com/lists/lucene/java-user/66264

So I decided to make a bit more progress towards "flexible indexing"
by first modularizing/isolating the classes that actually write the
index format.  The idea is to capture the logic of each (terms, freq,
positions/payloads) into separate interfaces and switch the flushing
of a new segment as well as writing the segment during merging to use
the same APIs.


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