Ian Wong

[LIVY-724] Support Session Lazy Recover

3

## What changes were proposed in this pull request? In this patch, we support a new session recovery mode. In this mode, the sessions on the failed server will not...

[LIVY-723] Server Registration

3

## What changes were proposed in this pull request? In this patch, we check in a ClusterManager class to handle the node join/leave cluster events based on Zookeeper. Users can...

[WIP][LIVY-664][Server] Spark application still running when Livy session creating was rejected

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## What changes were proposed in this pull request? Check if the session name is duplicated before submitting the application. ## How was this patch tested? Existing UTs and ITs.