Alexander Kolbasov commented on HIVE-18768:

Interesting - all DbNotificationListener tests in branch 3 are now failing here:

2018-03-12T20:52:22,775 ERROR [main] metastore.ObjectStore: couldnot get lock 
for update
java.lang.NullPointerException: null

This used to work before - I am not sure what actually changed in the test 
setup. [~vihangk1] any idea?

> Use Datanucleus to serialize notification updates
> -------------------------------------------------
>                 Key: HIVE-18768
>                 URL: https://issues.apache.org/jira/browse/HIVE-18768
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>    Affects Versions: 2.0.2, 3.0.0
>            Reporter: Alexander Kolbasov
>            Assignee: Alexander Kolbasov
>            Priority: Major
>         Attachments: HIVE-18768.01.patch, HIVE-18768.02.patch
> HIVE-16886 added code to serialize notification updates using LOCK FOR 
> UPDATE. It turns out that there is a simpler way - see HIVE-18526. The goal 
> of this JIRA is to use the approach from HIVE-18526 - Datanucleus based 
> solution.

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