Question

我正在尝试练习oozie工作流程。我的做法是从ftp获取文件并将其上传到cloudera - HDFS。

以下是我的java代码：

public class UploadHDFS extends Configured implements Tool {
    private static final Logger LOGGER = LoggerFactory.getLogger(UploadHDFS.class);
    public static void main(String[] args) throws Exception {
        int res = ToolRunner.run(new Configuration(), new UploadHDFS(), args);
        System.exit(res);
    }

    @Override
    public int run(String[] strings) throws Exception {
        FTPClient client = new FTPClient();
        InputStream ins = null;
        try {

            Configuration conf = getConf();

            System.out.println("------------%%+++++++++++++++++++---------------");
            for (Map.Entry<String, String> entry : conf) {
                System.out.printf("%s=%s\n", entry.getKey(), entry.getValue());
            }
            System.out.println("------------%%++++++++++++-----------");

            String host = conf.get("ftp.host.address").toString();
            String port = conf.get("ftp.port").toString();
            ....
            ....
      return 0;  
    }
}

另外，我已经配置了workflow.xml。见下文：

<workflow-app name="XXXXXX_test" xmlns="uri:oozie:workflow:0.4">
<start to="ftp_download_file"/>
<action name="ftp_download_file">
<java>
<job-tracker>${jobTracker}</job-tracker>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${nameNode}/user/admin/XXXXXX_test/B"/>
</prepare>
<configuration>
<property>
<name>ftp.host.address</name>
<value>192.168.1.158</value>
</property>
<property>
<name>ftp.port</name>
<value>21</value>
</property>
</configuration>
<main-class>UploadHDFS</main-class>
<file>workflow.xml#workflow.xml</file>
</java>
<ok to="merger_file"/>
<error to="kill"/>
</action>    
</workflow-app>

但是，我不确定为什么我无法从workflow.xml获取属性。该系统为行弹出NullPointerException：

String host = conf.get（“ftp.host.address”）。toString（）; String port = conf.get（“ftp.port”）。toString（）;

你能给我一些想法吗？

谢谢！

Answer 1

系统变量“oozie.action.conf.xml”传递的Oozie配置位置，请使用Java Action示例代码：

public class UploadHDFS {
public static void main(String[] args) throws Exception {
    new UploadHDFS().execute();
}

public void execute() {
    String configurationLocation = System.getProperty("oozie.action.conf.xml");
    Path localConfigurationPath = new Path(configurationLocation);
    Configuration configuration = new Configuration();
    configuration.addResource(localConfigurationPath);
    // .. continue here 
    }
}

Cloudera - Oozie无法从workflow.xml获取属性

1 个答案: