2
我想在amazon ec2上运行mapreduce任务。 我设置了所有的配置参数,然后调用AmazonElasticMapReduce服务的runFlowJob方法。 我想知道有没有什么办法可以知道这项工作是否已经完成,状态如何。 (我需要它知道什么时候我可以从s3拿起mapreduce结果进行进一步处理)如何知道amazon mapreduce任务何时完成?
当前代码只是继续执行,因为runJobFlow的调用是非阻塞的。
public void startMapReduceTask(String accessKey, String secretKey
,String eC2KeyPairName, String endPointURL, String jobName
,int numInstances, String instanceType, String placement
,String logDirName, String bucketName, String pigScriptName) {
log.info("Start running MapReduce");
// config.set
ClientConfiguration config = new ClientConfiguration();
AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
AmazonElasticMapReduce service = new AmazonElasticMapReduceClient(credentials, config);
service.setEndpoint(endPointURL);
JobFlowInstancesConfig conf = new JobFlowInstancesConfig();
conf.setEc2KeyName(eC2KeyPairName);
conf.setInstanceCount(numInstances);
conf.setKeepJobFlowAliveWhenNoSteps(true);
conf.setMasterInstanceType(instanceType);
conf.setPlacement(new PlacementType(placement));
conf.setSlaveInstanceType(instanceType);
StepFactory stepFactory = new StepFactory();
StepConfig enableDebugging = new StepConfig()
.withName("Enable Debugging")
.withActionOnFailure("TERMINATE_JOB_FLOW")
.withHadoopJarStep(stepFactory.newEnableDebuggingStep());
StepConfig installPig = new StepConfig()
.withName("Install Pig")
.withActionOnFailure("TERMINATE_JOB_FLOW")
.withHadoopJarStep(stepFactory.newInstallPigStep());
StepConfig runPigScript = new StepConfig()
.withName("Run Pig Script")
.withActionOnFailure("TERMINATE_JOB_FLOW")
.withHadoopJarStep(stepFactory.newRunPigScriptStep("s3://" + bucketName + "/" + pigScriptName, ""));
RunJobFlowRequest request = new RunJobFlowRequest(jobName, conf)
.withSteps(enableDebugging, installPig, runPigScript)
.withLogUri("s3n://" + bucketName + "/" + logDirName);
try {
RunJobFlowResult res = service.runJobFlow(request);
log.info("Mapreduce job with id[" + res.getJobFlowId() + "] completed successfully");
} catch (Exception e) {
log.error("Caught Exception: ", e);
}
log.info("End running MapReduce");
}
感谢,
阿维亚德