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From "Andrzej Bialecki (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-2632) FilteringCodec, TeeCodec, TeeDirectory
Date Tue, 14 Feb 2012 01:40:59 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrzej Bialecki  updated LUCENE-2632:
--------------------------------------

    Description: 
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.

  was:
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.

        Summary: FilteringCodec, TeeCodec, TeeDirectory  (was: TeeSinkCodec and FilteringCodec)

Patch updated to the latest trunk.

A few notes:
* FilteringCodec tests pass
* TeeDirectory tests pass
* TeeCodec tests pass only partially, failures occur during merge operations.
                
> 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
>
>
> 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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