huangzhir commented on issue #4847: URL: https://github.com/apache/kyuubi/issues/4847#issuecomment-1566734603
> What's the behavior of HiveServer2? Good idea. I looked into the code of HiveServer2, and I found that the sessionManager does not handle whether the session is actually alive.If HiveServer2 is using the Tez engine, it will ultimately reference a TezClient (tezSession). Inside the TezClient, there is a heartbeat check thread that regularly checks if the heartbeat is normal. If a session is not alive, it only prints error logs without performing any other handling. https://github.com/apache/tez/blame/ccad71dabceb850b58ff38e77fd206e68f62ce4b/tez-api/src/main/java/org/apache/tez/client/TezClient.java#L538 When executing SQL tasks, if TezClient encounters a SessionNotRunning exception, it will create a new tezclient and submit job . https://github.com/apache/hive/blob/7bfc54ffc8baf5f3e7de326b750fe9355b11132b/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezTask.java#L633 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
