Alan Gates commented on HIVE-13966:

Assigned back to Rahul as I didn't intend to take over the JIRA, I just had to 
assign it to myself to upload a patch.

> DbNotificationListener: can loose DDL operation notifications
> -------------------------------------------------------------
>                 Key: HIVE-13966
>                 URL: https://issues.apache.org/jira/browse/HIVE-13966
>             Project: Hive
>          Issue Type: Bug
>          Components: HCatalog
>            Reporter: Nachiket Vaidya
>            Assignee: Rahul Sharma
>            Priority: Critical
>         Attachments: HIVE-13966.1.patch, HIVE-13966.2.patch, 
> HIVE-13966.3.patch, HIVE-13966.pdf
> The code for each API in HiveMetaStore.java is like this:
> 1. openTransaction()
> 2. -- operation--
> 3. commit() or rollback() based on result of the operation.
> 4. add entry to notification log (unconditionally)
> If the operation is failed (in step 2), we still add entry to notification 
> log. Found this issue in testing.
> It is still ok as this is the case of false positive.
> If the operation is successful and adding to notification log failed, the 
> user will get an MetaException. It will not rollback the operation, as it is 
> already committed. We need to handle this case so that we will not have false 
> negatives.

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