Alexander Kolbasov updated SENTRY-1854:
    Attachment: SENTRY-1854.08.patch

> HMSFollower should handle notifications even if HDFS sync is disabled.
> ----------------------------------------------------------------------
>                 Key: SENTRY-1854
>                 URL: https://issues.apache.org/jira/browse/SENTRY-1854
>             Project: Sentry
>          Issue Type: Sub-task
>          Components: Sentry
>    Affects Versions: 2.0.0
>            Reporter: Na Li
>            Assignee: Na Li
>             Fix For: 2.0.0
>         Attachments: SENTRY-1854.007-master.patch, SENTRY-1854.08.patch
> Currently, Sentry does not start HMSFollower when HDFS sync is disabled. This 
> breaks PERM sync. For example, when a table/database is dropped, its 
> permission should be removed when perm sync is enabled. Without HMSFollower, 
> Sentry does not know when table/database is dropped, and therefore, cannot 
> remove the permission accordingly.
> Sentry needs to make updates to have the follow behavior
> 1) When HDFS sync is disabled + PERM sync is disabled, do not start 
> HMSFollower
> 2) when HDFS sync is enabled or PERM sync is enabled, start HMSFollower 
> (Sentry change).
> 3) when HDFS sync is enabled, we save path change and perm change. nothing 
> more. 
> 4) when perm sync is enabled, we update perm when table/database is created, 
> dropped or altered, nothing more.

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