我必須提取一些由Nutch在默認情況下不提供的Apache Nutch 2.3.1抓取數據的元數據信息。爲此我必須編寫一個插件。爲了學習的目的,我以Nutch tutorial爲起點。我知道這個教程是爲1.x版本。我已經改變了所有必要的分類,併成功地建立了它。以下是我所遵循的步驟。Apache Nutch 2.3.1插件不工作
- 創建類似$ NUTCH_HOME一個的/ src /插件/爲myplugin
- 複製指數的元數據,以我的plugina並創建一個文件myField.java CP -r索引元/ *爲myplugin/
- 目錄列表應該像
myPlugin/plugin.xml build.xml ivy.xml src/java/org/apache/nutch/indexer/AddField.java
- 插件/ myplgin/plugin.xml中應該是這樣的
- 變化的build.xml像
- Then
編輯您./conf/nutch-site.xml
<property> <name>plugin.includes</name> <value>plugin-1|plugin-2|myPlugin</value> <description>Added myPlugin</description> </property>
添加下列行分別在schema.xml和solrindex-mapping.xml中
<field name="pageLength" type="long" stored="true" indexed="true"/> <field dest="pageLength" source="pageLength"/>
然後我編我編寫的代碼(類似於網址給定的例子)
<?xml version="1.0" encoding="UTF-8"?> <plugin id="myPlugin" name="Add Field to Index" version="1.0.0" provider-name="your name"> <runtime> <library name="myPlugin.jar"> <export name="*"/> </library> </runtime> <extension id="org.apache.nutch.indexer.myPlugin" name="Add Field to Index" point="org.apache.nutch.indexer.IndexingFilter"> <implementation id="myPlugin" class="org.apache.nutch.indexer.AddField"/> </extension> </plugin>
<?xml version="1.0" encoding="UTF-8"?> <project name="myPlugin" default="jar"> <import file="../build-plugin.xml"/> </project>
<ant dir="myPlugin" target="deploy" />
當我以本地模式運行的Nutch,以下是索引到Solr步日誌信息
Active IndexWriters :
SOLRIndexWriter
solr.server.url : URL of the SOLR instance (mandatory)
solr.commit.size : buffer size when sending to SOLR (default 1000)
solr.mapping.file : name of the mapping file for fields (default solrindex-mapping.xml)
solr.auth : use authentication (default false)
solr.auth.username : username for authentication
solr.auth.password : password for authentication
IndexingJob: done.
我在solr schema中也添加了field pageLength。根據我的預期,應該有一個新的字段pageLength具有適當的值,但solr中沒有字段。
問題在哪裏?它是一個簡單的玩具例子。 這是nutch日誌文件(hadoop。日誌)輸出索引步驟
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: content dest: content
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: title dest: title
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: host dest: host
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: batchId dest: batchId
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: boost dest: boost
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: digest dest: digest
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: tstamp dest: tstamp
2016-07-26 16:53:25,649 INFO solr.SolrMappingReader - source: pageLength dest: pageLength
2016-07-26 16:53:26,140 INFO solr.SolrIndexWriter - Total 1 document is added.
2016-07-26 16:53:26,140 INFO indexer.IndexingJob - IndexingJob: done.
如何確認插件是由nutch加載的? 其次,有沒有什麼辦法可以測試Nutch插件,然後將其配置爲無法抓取?