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From Sean Broeder <>
Subject RE: Question about transaction manager on Trafodion architecture page
Date Tue, 07 Nov 2017 21:04:58 GMT
Hi Dave,
Thanks for pointing this out.

I think stating a specific release of HBase support in the architecture is a mistake because
it's just begging to become obsolete.  Perhaps a better replacement for the first bullet is
something like "Upgraded to support HBase coprocessor mechanism" because this will not likely
change in the near future.

I think the third bullet remains true.  We do support global transactions that span multiple
rows, regions and tables within an HBase cluster.


-----Original Message-----
From: Dave Birdsall [] 
Sent: Tuesday, November 7, 2017 8:49 AM
Subject: Question about transaction manager on Trafodion architecture page

Hi Trafodioners,

On the Trafodion architecture page (,
in the section on Transactions, there is the following text:

Trafodion supports distributed ACID transaction semantics using the Multi-Version Concurrency
Control (MVCC) model. The transaction management is built on top of a fork of the HBase-trx
project implementing the following changes:
*         Upgraded it to work on HBase version 0.98.1 (for CDH 5.1) or 0.98.0 (for HDP 2.1).
*         Added support for parallel worker processes doing work on behalf of the same transaction.
*         Added support for global transactions, that is, transactions that can encompass
resources (regions/HTables) across an HBase cluster.
*         Added transaction recovery after server failure.
I believe the first and third bullets above are out of date.
Can you suggest up-to-date text for these? I will then update the web page.

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