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Posted to dev@lucene.apache.org by "Shai Erera (JIRA)" <ji...@apache.org> on 2012/06/20 11:55:43 UTC
[jira] [Commented] (LUCENE-2632) FilteringCodec, TeeCodec,
TeeDirectory
[ https://issues.apache.org/jira/browse/LUCENE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397394#comment-13397394 ]
Shai Erera commented on LUCENE-2632:
------------------------------------
Hey Andrzej, this is so cool !
I was interested in using MultiPassIndexSplitter, and while chatting with Mike about the need to process the input directory a couple of times, he pointed me to this issue (i.e. TeeIndexSplitter). I was wondering what's the state of the issue? Are there still pending tasks to complete or can it be committed?
> FilteringCodec, TeeCodec, TeeDirectory
> --------------------------------------
>
> Key: LUCENE-2632
> URL: https://issues.apache.org/jira/browse/LUCENE-2632
> Project: Lucene - Java
> Issue Type: New Feature
> Components: core/index
> Affects Versions: 4.0
> Reporter: Andrzej Bialecki
> Attachments: LUCENE-2632.patch, LUCENE-2632.patch, LUCENE-2632.patch, LUCENE-2632.patch, LUCENE-2632.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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