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这篇文章主要为大家展示了“Spark-sql如何创建外部分区表”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“Spark-sql如何创建外部分区表”这篇文章吧。
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一、Spark-sql创建外部分区表
1.使用spark-sql
spark-sql --queue spark --master yarn --deploy-mode client --num-executors 10 --executor-cores 2 --executor-memory 3G
2.spark-sql中创建parquet分区表：
create external table pgls.convert_parq( bill_num string, logis_id string, store_id string, store_code string, creater_id string, order_status INT, pay_status INT, order_require_varieties INT, order_require_amount decimal(19,4), order_rec_amount decimal(19,4), order_rec_gpf decimal(19,4), deli_fee FLOAT, order_type INT, last_modify_time timestamp, order_submit_time timestamp ) partitioned by(order_submit_date date) row format serde 'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe' stored as parquetfile location '/test/spark/convert/parquet/bill_parq/';
二、CSV转Parquet
代码：org.apache.spark.ConvertToParquet.scala
package org.apache.spark
import com.ecfront.fs.operation.HDFSOperation
import org.apache.hadoop.conf.Configuration
import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.types._
/**
* CSV 转换为 parquet
* 参数：输入路径， 输出路径， 分区数
*/
object ConvertToParquet{
def main(args: Array[String]) {
if(args.length != 3){
println("jar args: inputFiles outPath numpartitions")
System.exit(0)
}
val inputPath = args(0)
val outPath = args(1)
val numPartitions = args(2).toInt
println("==========================================")
println("=========input: "+ inputPath )
println("=========output: "+ outPath )
println("==numPartitions: "+ numPartitions )
println("==========================================")
//判断输出目录是否存在，存在则删除
val fo = HDFSOperation(new Configuration())
val existDir = fo.existDir(outPath)
if(existDir) {
println("HDFS exists outpath: " + outPath)
println("start to delete ...")
val isDelete = fo.deleteDir(outPath)
if(isDelete){
println(outPath +" delete done. ")
}
}
val conf = new SparkConf()
val sc = new SparkContext(conf) //参数SparkConf创建SparkContext,
val sqlContext = new SQLContext(sc) //参数SparkContext创建SQLContext
val schema = StructType(Array(
StructField("bill_num",DataTypes.StringType,false),
StructField("logis_id",DataTypes.StringType,false),
StructField("store_id",DataTypes.StringType,false),
StructField("store_code",DataTypes.StringType,false),
StructField("creater_id",DataTypes.StringType,false),
StructField("order_status",DataTypes.IntegerType,false),
StructField("pay_status",DataTypes.IntegerType,false),
StructField("order_require_varieties",DataTypes.IntegerType,false),
StructField("order_require_amount",DataTypes.createDecimalType(19,4),false),
StructField("order_rec_amount",DataTypes.createDecimalType(19,4),false),
StructField("order_rec_gpf",DataTypes.createDecimalType(19,4),false),
StructField("deli_fee",DataTypes.FloatType,false),
StructField("order_type",DataTypes.IntegerType,false),
StructField("last_modify_time",DataTypes.TimestampType,false),
StructField("order_submit_time",DataTypes.TimestampType,false),
StructField("order_submit_date",DataTypes.DateType,false)))
convert(sqlContext, inputPath, schema, outPath, numPartitions)
}
//CSV转换为parquet
def convert(sqlContext: SQLContext, inputpath: String, schema: StructType, outpath: String, numPartitions: Int) {
// 将text导入到DataFrame
val df = sqlContext.read.format("com.databricks.spark.csv").
schema(schema).option("delimiter", ",").load(inputpath)
// 转换为parquet
// df.write.parquet(outpath) // 转换时以block数为分区数
df.coalesce(numPartitions).write.parquet(outpath) //自定义分区数
}
}打包后jar上传至本地目录： /soft/sparkTest/convert/spark.mydemo-1.0-SNAPSHOT.jar 事先在HDFS上生成CSV文件，HDFS目录： /test/spark/convert/data/order/2016-05-01/ 执行命令：
spark-submit --queue spark --master yarn --num-executors 10 --executor-cores 2 --executor-memory 3G --class org.apache.spark.ConvertToParquet --name ConvertToParquet file:/soft/sparkTest/convert/spark.mydemo-1.0-SNAPSHOT.jar /test/spark/convert/data/order/2016-05-01/ /test/spark/convert/parquet/bill_parq/order_submit_date=2016-05-01
pom.xml相关内容：
1.依赖包：
com.ecfront ez-fs 0.9 org.apache.spark spark-core_2.10 1.6.1 org.apache.spark spark-sql_2.10 1.6.1 com.databricks spark-csv_2.11 1.4.0 org.apache.hadoop hadoop-client 2.6.0
2.plugins(含打入依赖包)
net.alchim31.maven scala-maven-plugin 3.2.1 org.apache.maven.plugins maven-compiler-plugin 2.0.2 org.apache.maven.plugins maven-shade-plugin 1.4 *:* META-INF/*.SF META-INF/*.DSA META-INF/*.RSA net.alchim31.maven scala-maven-plugin scala-compile-first process-resources add-source compile scala-test-compile process-test-resources testCompile org.apache.maven.plugins maven-compiler-plugin compile compile org.apache.maven.plugins maven-shade-plugin 1.4 true package shade org.apache.spark.ConvertToParquet
三、表添加分区
spark-sql下执行
alter table pgls.convert_parq add partition(order_submit_date='2016-05-01');
可通过sql查询到相应数据：
select * from pgls.convert_parq where order_submit_date='2016-05-01' limit 5;
以上是“Spark-sql如何创建外部分区表”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！
