错误：java.lang.ClassNotFoundException：org.apache.hive.jdbc.HiveDriver postgres外部数据包装器

Question

    =# SELECT code, total_emp FROM sample_07 ORDER BY code LIMIT 3;
    **ERROR:  java.lang.ClassNotFoundException: org.apache.hive.jdbc.HiveDriver**
            at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
            at HadoopJDBCUtils.ConnInitialize(HadoopJDBCUtils.java:74)

    /usr/local/pgsql/lib under this directory i have got the following JARs
    hive-jdbc-2.1.0.2.6.5.8-7-standalone.jar
    hadoop-common-2.8.3-amzn-0.jar
    Hadoop_FDW.jar

我是否需要更改任何版本的JAR文件或者是否有我遗漏的内容，创建了扩展名hadoop_fdw

develper guide for foreign data wrapper hadoop_fdw wrapper link ref

Answer 1

在我的情况下也需要重新启动数据库，并设置类路径

 echo $HADOOP_FDW_CLASSPATH
 /usr/local/pgsql/lib/Hadoop_FDW.jar:/usr/local/pgsql/lib/hive-jdbc-2.1.0.2.6.5.8-7- 
 standalone.jar:/usr/local/pgsql/lib/:/home/ec2-user/agensgraph/contrib/hadoop_fdw/