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From "Julien Nioche (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1047) Pluggable indexing backends
Date Mon, 28 Jan 2013 10:15:13 GMT


Julien Nioche commented on NUTCH-1047:

@tejasp can reproduce the issue and am looking into it, thanks. Somehow the configuration
does not get passed on properly when using the crawl command. Thanks.

But i don't know why not add an option to set IndexerUrl such as bin/nutch solrindex -indexurl

whether it is passed as a parameter or via configuration should not make much of a difference.
Your suggestion also assumes that the indexing backend can be reached via a single URL which
is not necessarily the case as it could not need a URL at all or at the opposite need multiple
URLs. Better to leave that logic in the configuration and assume that the backends will find
whatever they need there.

 the corrent command to invoke the IndexingJob command is "bin/nutch solrindex http://localhost:8983/solr/
crawldb/ segments/20130121115214/ -filter".

as explained above we want to keep compatibility with the existing sorlindex command and not
change its syntax. Underneath it uses the new code based on plugins but sets the value of
the solr config. There is no shortcut for the generic indexing job command in the nutch script
yet but we could add one. For now it has to be called in full e.g. bin/nutch org.apache.nutch.indexer.IndexingJob
... which will make sense when we have other indexing backends and not just SOLR.

Think about 'nutch solrindex' as a shortcut for the generic command.

> Pluggable indexing backends
> ---------------------------
>                 Key: NUTCH-1047
>                 URL:
>             Project: Nutch
>          Issue Type: New Feature
>          Components: indexer
>            Reporter: Julien Nioche
>            Assignee: Julien Nioche
>              Labels: indexing
>             Fix For: 1.7
>         Attachments: NUTCH-1047-1.x-v1.patch, NUTCH-1047-1.x-v2.patch, NUTCH-1047-1.x-v3.patch,
> One possible feature would be to add a new endpoint for indexing-backends and make the
indexing plugable. at the moment we are hardwired to SOLR - which is OK - but as other resources
like ElasticSearch are becoming more popular it would be better to handle this as plugins.
Not sure about the name of the endpoint though : we already have indexing-plugins (which are
about generating fields sent to the backends) and moreover the backends are not necessarily
for indexing / searching but could be just an external storage e.g. CouchDB. The term backend
on its own would be confusing in 2.0 as this could be pertaining to the storage in GORA. 'indexing-backend'
is the best name that came to my mind so far - please suggest better ones.
> We should come up with generic map/reduce jobs for indexing, deduplicating and cleaning
and maybe add a Nutch extension point there so we can easily hook up indexing, cleaning and
deduplicating for various backends.

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