An AWS Lambda function which runs a Spring boot application to monitor and self-recover Hive Server2.

Basic flow is

• try to connect to Hive via jdbc(thru ELB to EMR master) and run basic query like show databases;.
• The query has a will timeout(using java Future) after 10s, then retry. Without timeout, the whole Lambda function will be timed out since hive query waits for more than 5 minutes.
• when succeed, quite
• when failed, we will try to execute the reload hive-server2 command on master node.