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https://issues.apache.org/jira/browse/LUCENE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905846#action_12905846
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Michael McCandless commented on LUCENE-2632:
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This looks very cool Andrzej!
> TeeSinkCodec and FilteringCodec
> -------------------------------
>
> Key: LUCENE-2632
> URL: https://issues.apache.org/jira/browse/LUCENE-2632
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 4.0
> Reporter: Andrzej Bialecki
> Attachments: LUCENE-2632.patch
>
>
> 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 this:
> {code}
> IndexWriter --> TeeSinkCodec
> | |
> | +--> StandardCodec --> Directory1
> +--> FilteringCodec --> StandardCodec --> Directory2
> {code}
> 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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