运行 Nutch 2 时出现连接被拒绝错误答案

【问题标题】：connection refused error when running Nutch 2运行 Nutch 2 时出现连接被拒绝错误
【发布时间】：2012-09-25 10:53:55
【问题描述】：

我试图在我的系统上运行 Nutch 2 爬虫，但出现以下错误：

Exception in thread "main" org.apache.gora.util.GoraException: java.io.IOException: java.sql.SQLTransientConnectionException: java.net.ConnectException: Connection refused
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:167)
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:135)
at org.apache.nutch.storage.StorageUtils.createWebStore(StorageUtils.java:69)
at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:243)
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)
Caused by: java.io.IOException: java.sql.SQLTr
ansientConnectionException: java.net.ConnectException: Connection refused
    at org.apache.gora.sql.store.SqlStore.getConnection(SqlStore.java:747)
    at org.apache.gora.sql.store.SqlStore.initialize(SqlStore.java:160)
    at org.apache.gora.store.DataStoreFactory.initializeDataStore(DataStoreFactory.java:102)
    at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:161)
    ... 8 more
Caused by: java.sql.SQLTransientConnectionException: java.net.ConnectException: Connection refused
    at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
    at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCConnection.<init>(Unknown Source)
    at org.hsqldb.jdbc.JDBCDriver.getConnection(Unknown Source)
    at org.hsqldb.jdbc.JDBCDriver.connect(Unknown Source)
    at java.sql.DriverManager.getConnection(DriverManager.java:620)
    at java.sql.DriverManager.getConnection(DriverManager.java:200)
    at org.apache.gora.sql.store.SqlStore.getConnection(SqlStore.java:739)
    ... 11 more
Caused by: org.hsqldb.HsqlException: java.net.ConnectException: Connection refused
    at org.hsqldb.ClientConnection.openConnection(Unknown Source)
    at org.hsqldb.ClientConnection.initConnection(Unknown Source)
    at org.hsqldb.ClientConnection.<init>(Unknown Source)
    ... 17 more
Caused by: java.net.ConnectException: Connection refused
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
    at java.net.Socket.connect(Socket.java:546)
    at java.net.Socket.connect(Socket.java:495)
    at java.net.Socket.<init>(Socket.java:392)
    at java.net.Socket.<init>(Socket.java:206)
    at org.hsqldb.server.HsqlSocketFactory.createSocket(Unknown Source)
    ... 20 more

有什么问题？我的互联网连接是直接的。

【问题讨论】：

您的数据库似乎有问题，我对 Notch 不熟悉，但连接到数据库而不是网络时出现问题。如果您可能需要设置任何数据库属性，您是否看过说明？
您是否按照此处列出的所有说明进行操作：wiki.apache.org/nutch/NutchTutorial#Steps
有一个数据库配置文件 conf/gora.properties 但我将其保留为默认值。因为教程中没有提到！
我还检查了链接，我完成了所有步骤，但我仍然收到错误
我遇到了完全相同的问题，并且认为 gora.properties 中的默认配置需要 SqlStore 属性。不幸的是，无法弄清楚如何在 Mac 中更新它们。

标签： java web-crawler nutch

【解决方案1】：

我有同样的错误。我将连接 URL 更改为

<property name="connection.url">jdbc:hsqldb:hsql://localhost</property>

到

<property name="connection.url">jdbc:hsqldb:mem://localhost</property>

它成功了。

【讨论】：

【解决方案2】：

有同样的错误。我忘记了 conf/nutch-site.xml 中的“配置”标签：

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

【讨论】：