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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] Created: (LUCENE-2632) TeeSinkCodec and FilteringCodec
Date Thu, 02 Sep 2010 15:32:54 GMT
TeeSinkCodec and FilteringCodec

                 Key: LUCENE-2632
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Index
    Affects Versions: 4.0
            Reporter: Andrzej Bialecki 

This issue adds two new Codec implementations:

* TeeSinkCodec: there have been attempts in the past to implement parallel writing to multiple
indexes so that they are all synchronized. This was however complicated due to the complexity
of IndexWriter/SegmentMerger logic. The solution presented here offers a similar functionality
but working on a different level - as the name suggests, the TeeSinkCodec duplicates term
data into multiple output Directories, and provides a multi-directory abstraction to perform
other operations that are not yet handled by the Codec API (e.g. stored fields handling).

* FilteringCodec is related in a remote way to the ideas of index pruning presented in LUCENE-1812
and the concept of tiered search. Since we can use TeeSinkCodec to write to multiple output
Directories in a synchronized way, we could also filter out or modify some of the data that
is being written. The FilteringCodec provides this functionality, so that you can use like
IndexWriter --> TeeSinkCodec
                 |  |
                 |  +--> StandardCodec --> Directory1
                 +--> FilteringCodec --> StandardCodec --> Directory2

The end result of this chain is two indexes that are kept in sync - one is the full regular
index, and the other one is a filtered index.

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