OR Focused crawler, MLLab, CSA, IISc.
-Rashmin Babaria we implemented our focused crawling approach on top of the nutch opensource crawler, which uses MapReduce programming model. All the changes made by us follow MapReduce model, so that the code remains simple and scalable. MapReduce It is easy to parallelize the code automatically on large cluster of machines if the code is written in MapReduce model. The run-time system is respo
Setting up Nutch 2.0 with MySQL to handle UTF-8 « Search and NLP for CJK
Open Source Search and Natural Language Processing for Japanese These instructions assume Ubuntu 12.04 and Java 6 or 7 installed and JAVA_HOME configured. Install MySQL Server and MySQL Client using the Ubuntu software center or sudo apt-get install mysql-server mysql-client at the command line. As MySQL defaults to latin (are we still in the 1990s?) we need to edit sudo vi /etc/mysql/my.cnf and u
Build Nutch 2.0
Testing Nutch 2.0 under Eclipse Table of Contents Introduction Setup the projects in Eclipse Install plugins Check out SVN directories Build the projects Nutch Datastores HSQL MySQL HBase Cassandra JUnit Tests Datastore Fetch Nutch Commands Running Nutch classes from Eclipse crawl readdb inject generate fetch parse updatedb solrindex Crawl script Conclusion Introduction This is a guide on setting
NutchHadoopTutorial - NUTCH - Apache Software Foundation
Nutch and Hadoop Tutorial As of the official Nutch 1.3 release the source code architecture has been greatly simplified to allow us to run Nutch in one of two modes; namely local and deploy. By default, Nutch no longer comes with a Hadoop distribution, however when run in local mode e.g. running Nutch in a single process on one machine, then we use Hadoop as a dependency. This may suit you fine if
Build Nutch 1.4 cluster with Hadoop | Everybody loves Rui
The current released version of Apache Nutch is 1.4. Since Nutch 1.3, there was no Hadoop distribution integrated with Nutch’s release package. So I have to build a Hadoop cluster seperately first, and then configure Nutch 1.4 work with Hadoop. My server OS is ubuntu 10.04 LTS, I have two server names cluster1 and cluster2. I’ll note the steps here. Preparation First of all, download Apache Nutch
NutchGotchas - NUTCH - Apache Software Foundation
The following acts as a comprehensive list of Nutch "Gotchas" which should act as a suitable prerequisite source of implicit information currently existing in the Nutch Codebase and in its general usage. Developing Nutch: Gotchas Developing Nutch Gotchas should be driven purely by community opinion and consensus that it is necessary to make implicit information explicit in an attempt to create an
NutchTutorial - NUTCH - Apache Software Foundation
IntroductionNutch is a well matured, production ready Web crawler. Nutch 1.x enables fine grained configuration, relying on Apache Hadoop data structures, which are great for batch processing. Being pluggable and modular of course has it's benefits, Nutch provides extensible interfaces such as Parse, Index and ScoringFilter's for custom implementations e.g. Apache Tika for parsing. Additonally, pl
OptimizingCrawls - NUTCH - Apache Software Foundation
Here are the things that could potentially slow down fetching 1) DNS setup 2) The number of crawlers you have, too many, too few. 3) Bandwidth limitations 4) Number of threads per host (politeness) 5) Uneven distribution of urls to fetch and politeness. 6) High crawl-delays from robots.txt (usually along with an uneven distribution of urls). 7) Many slow websites (again usually with an uneven dist
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OR Focused crawler, MLLab, CSA, IISc.
FixingOpicScoring - NUTCH - Apache Software Foundation
How to re-crawl with Nutch
CrawlDatumStates - NUTCH - Apache Software Foundation
Nutch - User - multiple values encountered for non multiValued field title
reducing similar top results in solr result output
Deduplication - Solr - Apache Software Foundation
https://my.oschina.net/sprint/blog/29829
Solr - User - Solr 3.1 indexing error Invalid UTF-8 character 0xffff
Nutch - User - No space left on device
クロールを順を追って実行する - Nutch調査録（mwSoft）
Re: java.net.UnknownHostException and Timeout during Fetching?