zhouyifan279 opened a new issue #1007: URL: https://github.com/apache/incubator-kyuubi/issues/1007
### 1. Describe the feature This is the first sub task of #913. In this task, the basic delegation token renewal framework is implemented in a service named HadoopDelegationTokenManager. Delegation tokens are managed in user granularity and are periodically renewed. Note: Sending delegation token from server to engine will be done in another task. ### 2. Motivation See #913 ### 3. Describe the solution HadoopDelegationTokenManager will be a member of class KyuubiSessionManager. When opening a KyuubiSession, HadoopDelegationTokenManager#obtainDelegationTokens is called to get delegation tokens of EngineRef#appUser. If delegation tokens of EngineRef#appUser have been obtained before, a CredentialsRef object containing delegation tokens is returned immediately. Else, HadoopDelegationTokenManager obtains delegation tokens and spawn a scheduled task to renew them. Method obtainDelegationTokens returns CredentialsRef when delegation tokens are obtained. CredentialsRef has a field named epoch, which is increased in the scheduled task to indicate delegation tokens updates. ### 4. Additional context -- 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: dev-unsubscr...@kyuubi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
