1，eclipse环境搭建
在eclipse中新建一个JAVA工程，导入必要的依赖包，目前用到的有:
其次编写JAVA 程序提交Oozie作业，这里可参考：oozie官方参考文档
在运行提交程序前，首先需要把相应的程序打成jar包，定义好workflow.xml，再把它们上传到HDFS中。然后在程序中指定作业的属性，这里我是直接用的oozie-examples.tar.gz中的示例。
部分代码参考如下：
OozieClient wc = new OozieClient("http://192.168.121.35:11000/oozie");
//create workflow job configuration
Properties conf = wc.createConfiguration();
conf.setProperty(OozieClient.APP_PATH, "hdfs://datanode1:8020/user/cdhfive/examples/apps/map-reduce");
//set a workflow parameters
conf.setProperty("nameNode", "hdfs://datanode1:8020");
conf.setProperty("jobTracker", "datanode1:8032");
conf.setProperty("inputDir", "/user/cdhfive/examples/input-data");
// conf.setProperty("outputDir", "hdfs://192.168.121.35:8020/user/cdhfive/examples/output-data");
conf.setProperty("outputDir", "/user/cdhfive/examples/output-data");
conf.setProperty("queueName", "default");
conf.setProperty("examplesRoot", "examples");
conf.setProperty("user.name", "cdhfive");
在代码中workflow的参数时需要注意以下几点：
①在workflow.xml中定义的变量需要在程序中进行设置。如workflow.xml中的 ${jobTracker}，则在JAVA程序中需要用语句:
conf.setProperty("jobTracker", "datanode1:8032");设置好。并且value 值要符合相应的格式。
2，作业提交过程中碰到的一些问题及解决：
由于我在本地windows系统上的用户hapjin运行的eclipse应用程序进行的提交，而集群则是远程的虚拟机。因此作业执行时报权限错误。
这里可以在作业提交过程中指定作业的用户名：conf.setProperty("user.name", "cdhfive")
ⓑ变量不能解析的错误：这是因为在workflow.xml中定义了一些变量，如${examplesRoot}，而在JAVA代码中没有给这些变量赋值（conf.setProperty(key,value))。
javax.servlet.jsp.el.ELException: variable [examplesRoot] cannot be resolved
解决：workflow.xml中定义的变量需要在Java代码中使用 conf.setProerty方法指定值。
整个完整的程序代码参考如下：
package test; import java.util.Properties; import org.apache.oozie.client.OozieClient;
import org.apache.oozie.client.OozieClientException;
import org.apache.oozie.client.WorkflowJob.Status; public class CommitJob {
public static void main(String[] args) {
//get a OozieClient for local Oozie
OozieClient wc = new OozieClient("http://192.168.121.35:11000/oozie"); //create workflow job configuration
Properties conf = wc.createConfiguration();
conf.setProperty(OozieClient.APP_PATH, "hdfs://datanode1:8020/user/cdhfive/examples/apps/map-reduce"); //set a workflow parameters
conf.setProperty("nameNode", "hdfs://datanode1:8020"); conf.setProperty("inputDir", "/user/cdhfive/examples/input-data");
// conf.setProperty("outputDir", "hdfs://192.168.121.35:8020/user/cdhfive/examples/output-data");
conf.setProperty("outputDir", "/user/cdhfive/examples/output-data");
conf.setProperty("queueName", "default");
conf.setProperty("examplesRoot", "examples");
conf.setProperty("user.name", "cdhfive"); //submit and start the workflow job
try{
String jobId = wc.run(conf);
System.out.println("Workflow job submitted"); //wait until the workflow job finishes
while(wc.getJobInfo(jobId).getStatus() == Status.RUNNING){
System.out.println("Workflow job running...");
try{
Thread.sleep(10*1000);
}catch(InterruptedException e){e.printStackTrace();}
}
System.out.println("Workflow job completed!");
System.out.println(wc.getJobId(jobId));
}catch(OozieClientException e){e.printStackTrace();} }
}
运行结果截图：
3，Oozie处理错误的方式
If the failure is of transient nature, Oozie will perform retries after a pre-defined time interval. The number of retries and timer interval for a type of action must be pre-configured at Oozie level. Workflow jobs can override such configuration.
Examples of a transient failures are network problems or a remote system temporary unavailable.
If the failure is of non-transient nature, Oozie will suspend the workflow job until an manual or programmatic intervention resumes the workflow job and the action start or end is retried.
如果作业是临时失败的，如因为网络原因或远程系统临时不可用，此时OOzie将会以预定的时间间隔重启作业。若作业不是临时失败的，Oozie将会挂起作业，此时需要手工或程序的干预才能恢复作业的运行。