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https://issues.apache.org/jira/browse/LUCENE-4975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649631#comment-13649631
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Shai Erera commented on LUCENE-4975:
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I've been wondering about that too, but chose to keep the facet replication
code under replicator for few reasons:
* A Revision contains files from multiple sources, and the taxonomy index is
partly responsible for that. And ReplicationClient respects that -- so I guess
it's not entirely true that the Replicator is unaware of taxonomy (even though
it would still work if I pulled the taxonomy stuff out of it).
* I think it makes less sense to require lucene-replicator.jar for every
faceted search app which makes use of lucene-facet.jar. The key reason is that
replicator requires few additional jars such as httpclient, httpcore, jetty,
servlet-api. Requiring lucene-facet.jar seems less painful to me, than
requiring every faceted search app out there to include all these jars even if
it doesn't want to do replication.
* I like to keep things local to the module. There are many similarities
between IndexAndTaxoRevision to IndexRevision (likewise for their handlers and
tests). Therefore whenever I made change to one, I knew I should go make a
similar change to the other.
All in all, I guess arguments can be made both ways, but I prefer for the now
to keep things local to the replicator module. Even in the future, I would
imagine that if we added support for replicating a suggester files, then it
would make sense to put a dependency between replicator and suggester, rather
than the other way around.
> 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
>
>
> 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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