sparksql怎么连接和使用mysql数据源
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spark sql 可以通过标准的jdbc连接数据库,获得数据源
public class SparkSql {public static SimpleDateFormat sdf = new SimpleDateFormat("_yyyyMMdd_HH_mm_ss"); private static final String appName = "spark sql test"; private static final String master = "spark://192.168.1.21:7077"; private static final String JDBCURL = "jdbc:mysql://192.168.1.18:3306/lng?user=root&password=123456"; public static void main(String[] avgs){ SparkContext context = new SparkContext(master, appName); SQLContext sqlContext = new SQLContext(context); // Creates a DataFrame based on a table named "people" // stored in a MySQL database. DataFrame df = sqlContext .read() .format("jdbc") .option("url", JDBCURL) .option("dbtable", "tsys_user") .load(); // Looks the schema of this DataFrame. df.printSchema(); // Counts people by age DataFrame countsByAge = df.groupBy("customStyle").count(); countsByAge.show(); // Saves countsByAge to S3 in the JSON format. countsByAge.write().format("json").save("hdfs://192.168.1.17:9000/administrator/sql-result" + sdf.format(new Date())); } }
如果没有包含mysql的驱动程序,需要参考http://stackoverflow.com/questions/34764505/no-suitable-driver-found-for-jdbc-in-spark
You might want to assembly you application with your build manager (Maven,SBT) thus you'll not need to add the dependecies in your
spark-submit
cli. (意思就是把mysql的驱动程序打包到提交到spark的jar包里)You can use the following option in your
spark-submit
cli :(改成下面,经测试,可行,或者加入export SPARK_CLASSPATH=$SPARK_CLASSPATH:/usr/local/spark-1.6.1-bin-hadoop2.6/conf/driverLib/mysql-connector-java-5.1.36.jar 到conf/spark-env.sh)spark-submit --driver-class-path /usr/local/spark-1.6.1-bin-hadoop2.6/conf/driverLib/mysql-connector-java-5.1.36.jar --class com.xxx.SparkSql /usr/local/spark.jar
Explanation :Supposing that you have all your jars in a
lib
directory in your project root, this will read all the libraries and add them to the application submit.You can also try to configure these 2 variables :
spark.driver.extraClassPath
andspark.executor.extraClassPath
inSPARK_HOME/conf/spark-default.conf
file and specify the value of these variables as the path of the jar file. Ensure that the same path exists on workernodes.(经测,不行)
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