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From Markus Jelsma <>
Subject RE: Website (crawler for) indexing
Date Thu, 06 Sep 2012 16:15:48 GMT

-----Original message-----
> From:Lochschmied, Alexander <>
> Sent: Thu 06-Sep-2012 16:04
> To:
> Subject: AW: Website (crawler for) indexing
> Thanks Rafał and Markus for your comments.
> I think Droids it has serious problem with URL parameters in current version (0.2.0)
from Maven central:
> I knew about Nutch, but I haven't been able to implement a crawler with it. Have you
done that or seen an example application?

We've been using it for some years now for our site search customers and are happy but it
can be quite a beast to begin with. The Nutch tutorial will walk you through the first steps,
crawling and indexing to Solr.

> It's probably easy to call a Nutch jar and make it index a website and maybe I will have
to do that.
> But as we already have a Java implementation to index other sources, it would be nice
if we could integrate the crawling part too.

You can control Nutch from within another application but i'd not recommend it, it's batch
based and can take quite some time and resources to run. We usually prefer running a custom
shell script controlling the process and call it via the cron.

> Regards,
> Alexander 
> ------------------------------------
> Hello!
> You can implement your own crawler using Droids
> ( or use Apache Nutch (,
which is very easy to integrate with Solr and is very powerful crawler.
> --
> Regards,
>  Rafał Kuć
>  Sematext :: :: Solr - Lucene - Nutch - ElasticSearch
> > This may be a bit off topic: How do you index an existing website and 
> > control the data going into index?
> > We already have Java code to process the HTML (or XHTML) and turn it 
> > into a SolrJ Document (removing tags and other things we do not want 
> > in the index). We use SolrJ for indexing.
> > So I guess the question is essentially which Java crawler could be useful.
> > We used to use wget on command line in our publishing process, but we do no longer
want to do that.
> > Thanks,
> > Alexander

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