当我从emr群集中的配置单元shell运行此命令时：

CREATE EXTERNAL TABLE my_db.my_table
     (col1 string, ...)
 STORED BY 'org.apache.hadoop.hive.dynamodb.DynamoDBStorageHandler' 
 TBLPROPERTIES (
     "dynamodb.table.name" = "table_name", 
     "dynamodb.column.mapping" = "col1:col1  ... "
 );

我得到以下错误：

FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. MetaException(message:Got exception: org.apache.hadoop.net.ConnectTimeoutException Call From ip-xx-xx-xx-xxx.ec2.internal/xx.xx.xx.xxx to ip-yy-yy-yy-yyy.ec2.internal:8020 failed on socket timeout exception: org.apache.hadoop.net.ConnectTimeoutException: 20000 millis timeout while waiting for channel to be ready for connect. ch : java.nio.channels.SocketChannel[connection-pending remote=ip-yy-yy-yy-yyy.ec2.internal/yy.yy.yy.yyy:8020]; For more details see:  http://wiki.apache.org/hadoop/SocketTimeout)

emr集群在vpc中。
我尝试编辑主节点的安全组的入站/出站规则，但到目前为止没有成功。
谢谢，迈克尔