Steve Yeom commented on HIVE-18619:

Using the flag by Eugene we can roll back a transaction in the local TxnManager 
instance inside the Driver (as Hadoop and Metastore client) 
in a JUnit based unit test. 
The same basic scenario I mentioned 5 days ago works fine. 
Each reader from SELECT gets ValidTxnList that includes aborted transaction id 
so as to figure out aborted delta directories.
I will add a simple test as a patch for this jira.

Gopal mentioned we need to delete the global transaction entries for the 
temporary table commands which are left over after Hive-18192 is checked in.
The current IMetaStoreClient implementation for temporary table does not have 
rollback() method to update the MetaStore DB.

> Verification of temporary Micromanaged table atomicity is needed 
> -----------------------------------------------------------------
>                 Key: HIVE-18619
>                 URL: https://issues.apache.org/jira/browse/HIVE-18619
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 3.0.0
>            Reporter: Steve Yeom
>            Assignee: Steve Yeom
>            Priority: Major
> Session based temporary table by HIVE-7090 had no consideration of 
> Micromanaged table 
> (MM) since there was no insert-only ACID table at its creation tije. 
> HIVE-18599 addressed the issue of no writes during CTTAS (Create Temporary 
> Table As Select)
> on Micro-Managed table. But atomicity of temporary MM table is not verified. 

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