Hi Marco, as Julien suggests, nutch is probably not the right place to look at. My personal advice is to have a look at Jimmy Lin's Cloud9, and specifically:
http://www.umiacs.umd.edu/~jimmylin/Cloud9/docs/exercises/indexing.html On 2/8/11 11:23 AM, Julien Nioche wrote: > Hi Marco > > Nutch now delegates the indexing and searching to SOLR, all the steps you > described (tokenization, lowercasing, etc...) are implemented there and > Nutch does not do anything special about it. From a Nutch point of view, the > indexing consists in gathering the data from various sources (crawldb, > segments, linkdb), apply some simple transformations (indexingfilters) then > send to SOLR. > You can of course write some custom map reduce function with SOLR embedded > but that's not what we do in Nutch. Have a look at the SOLR mailing lists, > you'll probably find more info there > > HTH > > Julien > > PS: (shameful self promotion for one of my pet projects) Behemoth ( > https://github.com/jnioche/behemoth) is about doing large scale text > processing on Hadoop. there is a component which delegates the indexing of > documents to SOLR but it could be modified to do what you described and have > SOLR instances within the map/reduce functions > > On 8 February 2011 10:06, Marco Didonna <[email protected]> wrote: > >> Hi everyone, >> I've build a little hadoop program to build an inverted index from a >> text collection. It performs basic analysis: tokenization, >> lowercasing, stopword removal. I was wondering if I could use some >> nutch components since I assume they've undergone a more intense >> tuning and so they're more efficient. I looked up in the javadoc >> (org.apache.nutch.indexer package) to find some hint but I didn't find >> any helping material...I hope someone of you can point me to the right >> place with - hopefully - some example code. >> I would like to underline that I do need anything but the indexing >> capabilities of nutch - no crawling or other stuff - and I need the >> whole thing to work on hadoop :) >> >> Thanks for your time >> >> MD >> > > -- Claudio Martella Digital Technologies Unit Research & Development - Analyst TIS innovation park Via Siemens 19 | Siemensstr. 19 39100 Bolzano | 39100 Bozen Tel. +39 0471 068 123 Fax +39 0471 068 129 [email protected] http://www.tis.bz.it Short information regarding use of personal data. According to Section 13 of Italian Legislative Decree no. 196 of 30 June 2003, we inform you that we process your personal data in order to fulfil contractual and fiscal obligations and also to send you information regarding our services and events. Your personal data are processed with and without electronic means and by respecting data subjects' rights, fundamental freedoms and dignity, particularly with regard to confidentiality, personal identity and the right to personal data protection. At any time and without formalities you can write an e-mail to [email protected] in order to object the processing of your personal data for the purpose of sending advertising materials and also to exercise the right to access personal data and other rights referred to in Section 7 of Decree 196/2003. The data controller is TIS Techno Innovation Alto Adige, Siemens Street n. 19, Bolzano. You can find the complete information on the web site www.tis.bz.it.
