我实现了spark应用程序。 我创建了spark上下文: pre $ private私有JavaSparkContext createJavaSparkContext(){ SparkConf conf = new SparkConf (); conf.setAppName(test); if(conf.get(spark.master,null)== null){ conf.setMaster(local [4]); } conf.set(fs.s3a.awsAccessKeyId,getCredentialConfig()。getS3Key()); conf.set(fs.s3a.awsSecretAccessKey,getCredentialConfig()。getS3Secret()); conf.set(fs.s3a.endpoint,getCredentialConfig()。getS3Endpoint()); 返回新的JavaSparkContext(conf); }
我试图通过spark数据集API(Spark SQL) :
String s =s3a://+ getCredentialConfig()。getS3Bucket(); 数据集<行> () .csv(s +/dataset.csv); System.out.println(Read size:+ csv.count());出现错误:
线程main中的异常com.amazonaws.services.s3.model.AmazonS3Exception:状态码:400,AWS服务:Amazon S3,AWS请求ID:1A3E8CBD4959289D,AWS错误代码:null,AWS错误消息:错误请求,S3扩展请求ID:Q1Fv8sNvcSOWGbhJSu2d3Nfgow00388IpXiiHNKHz8vI / zysC8V8 / YyQ1ILVsM2gWQIyTy1miJc =Hadoop版本:2.7
AWS端点:s3.eu-central-1.amazonaws
(关于hadoop 2.8 - 全部工作正常)
解决方案问题是:法兰克福不支持s3n。需要使用s3a。 此地区拥有V4 auth版本。 http://docs.aws.amazon。 com / general / latest / gr / rande.html#s3_region
欧盟(法兰克福)eu-central-1仅限版本4这意味着需要在aws客户端上启用它。 需要添加系统属性 $ b com.amazonaws.services.s3.enableV4 - > true
conf.set(com.amazonaws.services.s3.enableV4,true); //不适用于我在我用过的本地机器上:
System.setProperty(com.amazonaws.services.s3.enableV4,true);为了在AWS EMR上运行,需要在spark-submit中添加params:
spark.executor.extraJavaOptions = -Dcom.amazonaws.services.s3.enableV4 = true spark.driver.extraJavaOptions = -Dcom.amazonaws。 services.s3.enableV4 = true另外,您应该为文件系统添加类实现:
conf.set(spark.hadoop.fs.s3a.impl,org.apache.hadoop.fs.s3a.S3AFileSystem.class。的getName()); conf.set(spark.hadoop.fs.hdfs.impl,org.apache.hadoop.hdfs.DistributedFileSystem.class.getName()); conf.set(spark.hadoop.fs.file.impl,org.apache.hadoop.fs.LocalFileSystem.class.getName());
I implemented spark application. I've created spark context:
private JavaSparkContext createJavaSparkContext() { SparkConf conf = new SparkConf(); conf.setAppName("test"); if (conf.get("spark.master", null) == null) { conf.setMaster("local[4]"); } conf.set("fs.s3a.awsAccessKeyId", getCredentialConfig().getS3Key()); conf.set("fs.s3a.awsSecretAccessKey", getCredentialConfig().getS3Secret()); conf.set("fs.s3a.endpoint", getCredentialConfig().getS3Endpoint()); return new JavaSparkContext(conf); }And I try to get data from s3 via spark dataset API (Spark SQL):
String s = "s3a://" + getCredentialConfig().getS3Bucket(); Dataset<Row> csv = getSparkSession() .read() .option("header", "true") .csv(s + "/dataset.csv"); System.out.println("Read size :" + csv.count());There is an error:
Exception in thread "main" com.amazonaws.services.s3.model.AmazonS3Exception: Status Code: 400, AWS Service: Amazon S3, AWS Request ID: 1A3E8CBD4959289D, AWS Error Code: null, AWS Error Message: Bad Request, S3 Extended Request ID: Q1Fv8sNvcSOWGbhJSu2d3Nfgow00388IpXiiHNKHz8vI/zysC8V8/YyQ1ILVsM2gWQIyTy1miJc=Hadoop version: 2.7
AWS endpoint: s3.eu-central-1.amazonaws
(On hadoop 2.8 - all works fine)
解决方案The problem is: Frankfurt doesn't support s3n. Need to use s3a. And this region has V4 auth version. docs.aws.amazon/general/latest/gr/rande.html#s3_region
EU (Frankfurt) eu-central-1 Version 4 only
It mean's need to enable it on aws client. Need to add system property
com.amazonaws.services.s3.enableV4 -> true
conf.set("com.amazonaws.services.s3.enableV4", "true");//doesn't work for meOn local machine I've used:
System.setProperty("com.amazonaws.services.s3.enableV4", "true");For running on AWS EMR need to add params to spark-submit:
spark.executor.extraJavaOptions=-Dcom.amazonaws.services.s3.enableV4=true spark.driver.extraJavaOptions=-Dcom.amazonaws.services.s3.enableV4=trueAdditionally you should add class implementation for file systems:
conf.set("spark.hadoop.fs.s3a.impl", org.apache.hadoop.fs.s3a.S3AFileSystem.class.getName()); conf.set("spark.hadoop.fs.hdfs.impl", org.apache.hadoop.hdfs.DistributedFileSystem.class.getName()); conf.set("spark.hadoop.fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class.getName());
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