問題

當前采用python利用structstreaming寫入hive table時，始終沒有寫入的權限，報錯如下：

Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException):Permission denied : user=xxx, access="WRITE", inode="/":hdfs:supergroup:drwxr-xr-x

根據查詢了解到，structstreaming持久化寫入數據時，需要配置checkpointLocation參數，不然會寫入默認路徑：根目錄下面，但是根目錄沒有寫入權限，所以會報錯；
以下是查詢的結果：

This scenario is ideal for long-term persistence of output. Unlike memory and console sinks, files and directories are fault-tolerant. As such, this option requires a checkpoint directory, where state is maintained for fault-tolerance.

附上查詢結果網址如下：https://databricks.com/blog/2017/04/04/real-time-end-to-end-integration-with-apache-kafka-in-apache-sparks-structured-streaming.html