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https://issues.apache.org/jira/browse/LUCENE-4975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649727#comment-13649727
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Adrien Grand commented on LUCENE-4975:
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bq. Then maybe we could have sub-modules for specific replication strategies?

To make my point a little clearer, I was suggesting something pretty much like 
the analysis module: analyzers that require additional dependencies (such as 
icu or morfologik) are in their own sub-module so that you don't need to pull 
the ICU or Morfologik JARs if you just want to use LetterTokenizer (which is in 
lucene/analysis/common).

Likewise, we could have the interface and the logic to replicate simple (no 
sidecar data) indexes in lucene/replicator/common and have sub-modules for 
facet (lucene/replicator/facet) or suggesters (lucene/replicator/suggesters).

This may look overkill but at least this would help us keep dependencies clean 
between modules.
                
> Add Replication module to Lucene
> --------------------------------
>
>                 Key: LUCENE-4975
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4975
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>         Attachments: LUCENE-4975.patch, LUCENE-4975.patch, LUCENE-4975.patch, 
> LUCENE-4975.patch, LUCENE-4975.patch
>
>
> I wrote a replication module which I think will be useful to Lucene users who 
> want to replicate their indexes for e.g high-availability, taking hot backups 
> etc.
> I will upload a patch soon where I'll describe in general how it works.

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