Apache Nutch is a highly extensible and scalable open source web crawler software project.

Clone this repo:
  1. ac9c435 Merge pull request #485 from sebastian-nagel/NUTCH-2748-redir-exceeded by Sebastian Nagel · 7 days ago master
  2. 969a194 NUTCH-2748 Fetch status gone (redirect exceeded) not to overwrite existing items in CrawlDb by Sebastian Nagel · 4 weeks ago
  3. ec45fe5 Merge pull request #480 from sebastian-nagel/NUTCH-2746-url-normalizer-basic-idn by Sebastian Nagel · 2 weeks ago
  4. c23afa8 Merge pull request #484 from balashashanka/NUTCH-2739 by Sebastian Nagel · 2 weeks ago
  5. 597eb71 NUTCH-2739: Upgrade ES and migrate to REST client by Shashanka Balakuntala Srinivasa · 5 weeks ago

Apache Nutch README

For the latest information about Nutch, please visit our website at:


and our wiki, at:


To get started using Nutch read Tutorial:



To contribute a patch, follow these instructions (note that installing Hub is not strictly required, but is recommended).

0. Download and install hub.github.com
1. File JIRA issue for your fix at https://issues.apache.org/jira/browse/NUTCH
- you will get issue id NUTCH-xxx where xxx is the issue ID.
2. git clone http://github.com/apache/nutch.git 
3. cd nutch
4. git checkout -b NUTCH-xxx
5. edit files (please try and include a test case if possible)
6. git status (make sure it shows what files you expected to edit)
7. Make sure that your code complies with the [Nutch codeformatting template](http://svn.apache.org/repos/asf/nutch/branches/2.x/eclipse-codeformat.xml), which is basially two space indents
8. git add <files>
9. git commit -m “fix for NUTCH-xxx contributed by <your username>”
10. git fork
11. git push -u <your git username> NUTCH-xxx
12. git pull-request

IDE setup

Generate Eclipse project files

ant eclipse

and follow the instructions in Importing existing projects.

IntelliJ IDEA users can also import Eclipse projects using the “Eclipser” pluginhttps://plugins.jetbrains.com/plugin/7153-eclipser), see also Importing Eclipse Projects into IntelliJ IDEA.

Export Control

This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See http://www.wassenaar.org/ for more information.

The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this Apache Software Foundation distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.

The following provides more details on the included cryptographic software:

Apache Nutch uses the PDFBox API in its parse-tika plugin for extracting textual content and metadata from encrypted PDF files. See http://pdfbox.apache.org for more details on PDFBox.