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From "Rahul Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13966) DbNotificationListener: can loose DDL operation notifications
Date Tue, 12 Jul 2016 16:42:20 GMT

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Rahul Sharma commented on HIVE-13966:
-------------------------------------

Working on adding test cases, looks  a bit tricky as we need to prevent the entry to notification
log to check the complete metastore operation rollback. Will update the new patch soon. 

> 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
>
>
> 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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