nutch官方网重爬的script

Version 0.8.0 and 0.9.0

Place in the bin sub-directory within your Nutch install and run.

CALL THE SCRIPT USING THE FULL PATH TO THE SCRIPT OR IT WON'T WORK

Example Usage

./usr/local/nutch/bin/recrawl /usr/local/tomcat/webapps/ROOT /usr/local/nutch/crawl 10 31

Setting adddays at 31 causes all pages will to be recrawled.

Changes for 0.9.0

No changes necessary for this to run with Nutch 0.9.0.

Code

 

#!/bin/bash

# Nutch recrawl script.
# Based on 0.7.2 script at http://today.java.net/pub/a/today/2006/02/16/introduction-to-nutch-2.html

#
# The script merges the new segments all into one segment to prevent redundant
# data. However, if your crawl/segments directory is becoming very large, I
# would suggest you delete it completely and generate a new crawl. This probaly
# needs to be done every 6 months.
#
# Modified by Matthew Holt
# mholt at elon dot edu

if [ -n "$1" ]
then
  tomcat_dir=$1
else
  echo "Usage: recrawl servlet_path crawl_dir depth adddays [topN]"
  echo "servlet_path - Path of the nutch servlet (full path, ie: /usr/local/tomc
at/webapps/ROOT)"
  echo "crawl_dir - Path of the directory the crawl is located in. (full path, i
e: /home/user/nutch/crawl)"
  echo "depth - The link depth from the root page that should be crawled."
  echo "adddays - Advance the clock # of days for fetchlist generation. [0 for n
one]"
  echo "[topN] - Optional: Selects the top # ranking URLS to be crawled."
  exit 1
fi

if [ -n "$2" ]
then
  crawl_dir=$2
else
  echo "Usage: recrawl servlet_path crawl_dir depth adddays [topN]"
  echo "servlet_path - Path of the nutch servlet (full path, ie: /usr/local/tomc
at/webapps/ROOT)"
  echo "crawl_dir - Path of the directory the crawl is located in. (full path, i
e: /home/user/nutch/crawl)"
  echo "depth - The link depth from the root page that should be crawled."
  echo "adddays - Advance the clock # of days for fetchlist generation. [0 for n
one]"
  echo "[topN] - Optional: Selects the top # ranking URLS to be crawled."
  exit 1
fi

if [ -n "$3" ]
then
  depth=$3
else
  echo "Usage: recrawl servlet_path crawl_dir depth adddays [topN]"
  echo "servlet_path - Path of the nutch servlet (full path, ie: /usr/local/tomc
at/webapps/ROOT)"
  echo "crawl_dir - Path of the directory the crawl is located in. (full path, i
e: /home/user/nutch/crawl)"
  echo "depth - The link depth from the root page that should be crawled."
  echo "adddays - Advance the clock # of days for fetchlist generation. [0 for n
one]"
  echo "[topN] - Optional: Selects the top # ranking URLS to be crawled."
  exit 1
fi

if [ -n "$4" ]
then
  adddays=$4
else
  echo "Usage: recrawl servlet_path crawl_dir depth adddays [topN]"
  echo "servlet_path - Path of the nutch servlet (full path, ie: /usr/local/tomcat/webapps/ROOT)"
  echo "crawl_dir - Path of the directory the crawl is located in. (full path, ie: /home/user/nutch/crawl)"
  echo "depth - The link depth from the root page that should be crawled."
  echo "adddays - Advance the clock # of days for fetchlist generation. [0 for n
one]"
  echo "[topN] - Optional: Selects the top # ranking URLS to be crawled."
  exit 1
fi

if [ -n "$5" ]
then
  topn="-topN $5"
else
  topn=""
fi

#Sets the path to bin
nutch_dir=`dirname $0`

# Only change if your crawl subdirectories are named something different
webdb_dir=$crawl_dir/crawldb
segments_dir=$crawl_dir/segments
linkdb_dir=$crawl_dir/linkdb
index_dir=$crawl_dir/index

# The generate/fetch/update cycle
for ((i=1; i <= depth ; i++))
do
  $nutch_dir/nutch generate $webdb_dir $segments_dir $topn -adddays $adddays
  segment=`ls -d $segments_dir