nutch-2.x

<b>Introduction</b>
This document describes how to get Nutch 2.X to use HBase as a storage backend（后台） for Gora. It is assumed（假定） that you have a working knowledge of configuring Nutch 1.X, as currently configuration in 2.X is more complex. It is important to take this in to consideration before progressing any further. We therefore strongly advise that you check out the Nutch 1.X tutorial.

这个文档描述了怎么获取nutch2.x使用hbase作为存储后台为gora。如果你已经有了使用nutch1.x的经验，作为现在配置在2.x是更加复杂了。它很重要做下一步考虑。所以我门建议你查看Nutch1.x的教程。

<b>Obtaining（获得） Software and Configuration</b>

• Grab the latest distribution of Nutch 2.X from here. Do NOT build the source yet. From now on we will refer to the directory where the Nutch code resides as $NUTCH_HOME.

下载nutch2.x的最新版本。先不要build源码，现在我们先配置Nutch——home环境变量

• Download and configure HBase 0.98.8-hadoop2. You can get it here (N.B. Each version of Gora is tied to a particular version of HBase, we therefore suggest you use this version if possible. If you decide to use another version of HBase please do not be surprised if the stack does not work. You should also obtain current documentation for HBase however please again take into consideration that the version of HBase we recommend you use may not correlate to the current documentation. Please keep this in mind and use your initiative.

下载配置hbase0.98.8-hadoop2。你可以在这里获得。每个gora都绑定在一个特别的hbase版本，但是我们建议你使用这个版本。如果你决定使用另外一个hbase版本，请不要惊奇如果stack不工作。你需要获取当前的hbase文档，但是请注意这个版本的hbase我建议你使用的可能不是当前的文档相关的。请时刻主动记住这个。

• Specify（指定） the GORA backend in $NUTCH_HOME/conf/nutch-site.xml along with all of the other Configuration options suggested within the Nutch 1.x tutorial.

指定gora后台在$nutch_home/conf/nutch-site.xml随着和我们在1.x中建议的所有的其他配置选项。

<property> 
<name>storage.data.store.class</name> 
<value>org.apache.gora.hbase.store.HBaseStore</value> 
<description>Default class for storing data</description>
</property>

• Ensure the HBase gora-hbase dependency is available in $NUTCH_HOME/ivy/ivy.xml

确保hbase gora-hbase 依赖可用在ivy文件中

<dependency org="org.apache.gora" name="gora-hbase" rev="0.6.1" conf="*->default" />

In addition add the missing hbase-common-0.98.8-hadoop2.jar transitive （传递）dependency, this is a bug in gora-hbase 0.6.1 as described here. This bug is removed in current Gora development.

另外添加缺失的hbase-common-0.98.8-hadoop2.jar 传递依赖，这是一个bug在gora-hbase0.6.1 并且在这里有描述。这个bug被移动到gora 开发。

 <dependency org="org.apache.hbase" 
name="hbase-common" rev="0.98.8-hadoop2" conf="*->default" />

Ensure that HBaseStore is set as the default datastore in $NUTCH_HOME/conf/gora.properties. Other documentation for HBaseStore can be found here

确保hbasestore被设置作为默认的数据存储在nutch的gora.properties。别的文档hbasestore的可以在这看。

 gora.datastore.default=org.apache.gora.hbase.store.HBaseStore

• N.B. It's probably worth checking and setting all your usual configuration settings within $NUTCH_HOME/conf/nutch-site.xml etc. before progressing.

NB.这是可能的值得查看设置所有的常用的配置设置在nutch-site.xml etc. 在进行前。

• Compile Nutch -> via
  ant runtime

• Make sure HBase is started and working properly as per the quick start tutorial.

确保hbase 被开启并且工作适合的作为

• Create a list of URLs as you would do within the Nutch 1.X tutorial.

创建一个列表urls,作为在使用

<b>Invoke Nutch</b>
You should then be able to inject URLs into HBase. Try going to $NUTCH_HOME/runtime/local/bin and do :

你需要可以注入urls 到hbase。试着去bin下的

nutch inject /someseedDir 
nutch readdb

Whats Next
You may want to check out the documentation for the Nutch Web Application and then the Nutch REST API as this gives a comprehensive overview of ongoing work with making Nutch 2.X easier to use.