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From "Julien Nioche (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1047) Pluggable indexing backends
Date Wed, 30 Jan 2013 08:41:17 GMT


Julien Nioche commented on NUTCH-1047:

[~wastl-nagel] a text based indexer is a good idea. Having one generating data at the format
used by CloudSearch see [NUTCH-1517] would be cool as well. As for your concerns : most people
currently use the SOLR indexer which will still be the one activated by default. I expect
a minority of people will try and use something else and if they do then checking which one
is activated is no big deal, either via config file or from logs. Passing the options via
the config with -D is not very different from using a standard parameter, with the added benefit
though that it gives us the possibility to set things in nutch-site.xml once and for all and
hence make the commands much simpler. As for the list of properties, they would vary from
backend to backend anyway. Each plugin could have a README describing what its options are,
compared to having everything in nutch-default.xml at least the descriptions will be contained
within the related plugin.

[~tejasp] good catch for the number of args, will fix it. Re-usage message : we could add
a getUsage()  method to each backend that the generic command will call for all the active
indexing plugins. I think the solrindex shortcut is just a temporary measure though until
the documentation is up to scratch and the user base has got used to the generic commands.

Thanks for taking the time to share your thoughts, guys. 


> 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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