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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-2632) FilteringCodec, TeeCodec, TeeDirectory
Date Thu, 27 Sep 2012 20:43:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13465065#comment-13465065
] 

Shai Erera commented on LUCENE-2632:
------------------------------------

Reviewed the issue's description and patch again -- FilteringCodec has nothing to do with
FilterCodec. The latter is used if you want to override a specific Codec's behavior. FilteringCodec
is about not filtering data that is written to a Directory, as Andrzej explains in the issue's
description.

Therefore FilteringCodec should remain. Maybe we can split this issue .. FilteringCodec is
unrelated to TeeCodec/Directory/IndexSplitter as far as I could tell?

Anyway, still need to make TestTeeCodec work.
                
> FilteringCodec, TeeCodec, TeeDirectory
> --------------------------------------
>
>                 Key: LUCENE-2632
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2632
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/index
>    Affects Versions: 4.0-ALPHA
>            Reporter: Andrzej Bialecki 
>         Attachments: LUCENE-2632.patch, LUCENE-2632.patch, LUCENE-2632.patch, LUCENE-2632.patch,
LUCENE-2632.patch, LUCENE-2632-trunk.patch
>
>
> This issue adds two new Codec implementations:
> * TeeCodec: 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 TeeCodec duplicates index data
into multiple output Directories.
> * TeeDirectory (used also in TeeCodec) is a simple abstraction to perform Directory operations
on several directories in parallel (effectively mirroring their data). Optionally it's possible
to specify a set of suffixes of files that should be mirrored so that non-matching files are
skipped.
> * 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 TeeCodec 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 --> TeeCodec
>                  |  |
>                  |  +--> 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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