nutch2.2.1+mysql抓取数据

基本环境：linux centos6.5 nutch2.2.1 源码包， mysql 5.5 ，elasticsearch1.1.1, jdk1.7

1、下载地址http://mirror.bjtu.edu.cn/apache/nutch/2.2.1/ 解压

2、修改数据存储方式是mysql

　　修改nutch根目录/ivy/ivy.xml文件，原来mysql数据存储是注释的。

   <dependency org="org.apache.gora" name="gora-core" rev="0.2.1" conf="*->default"/>
104     <!-- Uncomment this to use SQL as Gora backend. It should be noted that the
105     gora-sql 0.1.1-incubating artifact is NOT compatable with gora-core 0.3. Users should
106     downgrade to gora-core 0.2.1 in order to use SQL as a backend. -->
107
108     <dependency org="org.apache.gora" name="gora-sql" rev="0.1.1-incubating" conf="*->default" />
109
110     <!-- Uncomment this to use MySQL as database with SQL as Gora store. -->
111
112     <dependency org="mysql" name="mysql-connector-java" rev="5.1.18" conf="*->default">    

3、修改连接数据库地址和用户名,在 nutch根目录/conf/gora.properties 将原来的注释掉

#gora.sqlstore.jdbc.driver=org.hsqldb.jdbc.JDBCDriver
#gora.sqlstore.jdbc.url=jdbc:hsqldb:hsql://localhost/nutchtest
#gora.sqlstore.jdbc.user=sa
#gora.sqlstore.jdbc.password=
# MySQL properties #
###############################
gora.sqlstore.jdbc.driver=com.mysql.jdbc.Driver
gora.sqlstore.jdbc.url=jdbc:mysql://ip:3306/nutch? useUnicode=true&characterEncoding=utf8&autoReconnect=true&zeroDateTimeBehavior=convertToNull
gora.sqlstore.jdbc.user=user
gora.sqlstore.jdbc.password=pwd

4、修改修改conf的nutch-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<configuration>
<property>
<name>http.agent.name</name>
<value>My Spider</value>
</property>

<property>
<name>http.accept.language</name>
<value>ja-jp,zh-cn,en-us,en-gb,en;q=0.7,*;q=0.3</value>
</property>

<property>
<name>parser.character.encoding.default</name>
<value>utf-8</value>
<description>The character encoding to fall back to when no other information
is available</description>
</property>

<property>
<name>storage.data.store.class</name>
<value>org.apache.gora.sql.store.SqlStore</value>
</property>

<property>
<name>plugin.includes</name>
<value>protocol-http|urlfilter-regex|parse-(html|tika)|index-(basic|anchor)|urlnormalizer-(pass|regex|basic)|scoring-opic</value>
</property>

</configuration>

5、使用ant 编译源码

　　在nutch 目录下执行 ant

job:
      [jar] Building jar: /home/hadoop/nutch221/build/apache-nutch-2.2.1.job

runtime:
    [mkdir] Created dir: /home/hadoop/nutch221/runtime
    [mkdir] Created dir: /home/hadoop/nutch221/runtime/local
    [mkdir] Created dir: /home/hadoop/nutch221/runtime/deploy
     [copy] Copying 1 file to /home/hadoop/nutch221/runtime/deploy
     [copy] Copying 2 files to /home/hadoop/nutch221/runtime/deploy/bin
     [copy] Copying 1 file to /home/hadoop/nutch221/runtime/local/lib
     [copy] Copying 1 file to /home/hadoop/nutch221/runtime/local/lib/native
     [copy] Copying 26 files to /home/hadoop/nutch221/runtime/local/conf
     [copy] Copying 2 files to /home/hadoop/nutch221/runtime/local/bin
     [copy] Copying 100 files to /home/hadoop/nutch221/runtime/local/lib
     [copy] Copying 106 files to /home/hadoop/nutch221/runtime/local/plugins
     [copy] Copied 2 empty directories to 2 empty directories under /home/hadoop/nutch221/runtime/local/test

BUILD SUCCESSFUL
Total time: 41 seconds     编译成功。

6 创建数据库

CREATE DATABASE nutch DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci; 

CREATE TABLE `webpage` (`id` varchar(767) CHARACTER SET latin1 NOT NULL,
`headers` blob,
`text` mediumtext DEFAULT NULL,
`status` int(11) DEFAULT NULL,
`markers` blob,
`parseStatus` blob,
`modifiedTime` bigint(20) DEFAULT NULL,
`score` float DEFAULT NULL,
`typ` varchar(32) CHARACTER SET latin1 DEFAULT NULL,
`baseUrl` varchar(512) CHARACTER SET latin1 DEFAULT NULL,
`content` mediumblob,
`title` varchar(2048) DEFAULT NULL,
`reprUrl` varchar(512) CHARACTER SET latin1 DEFAULT NULL,
`fetchInterval` int(11) DEFAULT NULL,
`prevFetchTime` bigint(20) DEFAULT NULL,
`inlinks` mediumblob,
`prevSignature` blob,
`outlinks` mediumblob,
`fetchTime` bigint(20) DEFAULT NULL,
`retriesSinceFetch` int(11) DEFAULT NULL,
`protocolStatus` blob,
`signature` blob,
`metadata` blob,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

7、执行爬行操作：

bin/nutch crawl urls -depth 3

执行完在mysql中即可以查看到爬虫抓取的内容

8、执行索引操作：

bin/nutch elasticindex clustername -all

遇到问题：在执行第7步的时候出现 异常：

[email protected] bin]$ nutch crawl urls -depth 3
Exception in thread "main" java.lang.ClassNotFoundException: org.apache.gora.sql.store.SqlStore
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:190)
    at org.apache.nutch.storage.StorageUtils.getDataStoreClass(StorageUtils.java:89)
    at org.apache.nutch.storage.StorageUtils.createWebStore(StorageUtils.java:73)
    at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:221)
    at org.apache.nutch.crawl.Crawler.runTool(Crawler.java:68)
    at org.apache.nutch.crawl.Crawler.run(Crawler.java:136)
    at org.apache.nutch.crawl.Crawler.run(Crawler.java:250)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.nutch.crawl.Crawler.main(Crawler.java:257)

参照网上资料：http://blog.sina.com.cn/s/blog_3c9872d00101p4f0.html 还是没有解决。

官方解决办法：

http://mail-archives.apache.org/mod_mbox/nutch-user/201307.mbox/%[email protected].com%3E

文章参考：

官网资料：http://nlp.solutions.asia/?p=362

https://issues.apache.org/jira/browse/NUTCH-1473