8:09 a.m.
Paul Robinson [https://community.jboss.org/people/paul.robinson] created the discussion
"Re: Implementing 1PC in WS-AT (WS-Atomic Transaction)"
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Chirag,
The problem with what you are suggesting is that you assume that the participant knows 1PC
will be used. However, 1PC is an optimization selected by the coordinator when it observes
that only one participant has been registered for the transaction. In many cases the
participant will not know that it is alone. I think you instead need to allow the
participant to notify the coordinator that it is capable of participating in a 1PC or 2PC
protocol. The coordinator would then select the 1PC optimization if there is only one
participant registered for the transaction and only if that participant is 1PC capable.
WS-AT allows individual participants to register for different protocols. See "3
AtomicTransactionProtocols" of the WS-AT spec. I think you would probably need to add
another one of those protocols for a 2PC protocol that can also do 1PC. You will probably
also need to consider what the state table would like like for your new protocol. This
would need to be inline with those in section "9 State Tables".
From the implementation point of view, XTS has protocol engines for
each of the protocols in the WS-AT spec. You would need to add a new one of those to
handle the new protocol. There's other things too, that you would need to do to
implement it, but we can get into that later.
The new protocol would also need to support recovery. But again, we can consider that
later. Maybe this is something outside of the scope of your masters project?
Paul.
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12:01 p.m.
Chirag Rana [https://community.jboss.org/people/chiragr] created the discussion
"Re: Implementing 1PC in WS-AT (WS-Atomic Transaction)"
To view the discussion, visit: https://community.jboss.org/message/826460#826460
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Hello Paul,
Thank you so much for the information Paul. I will start working on the approach you have
suggested and will keep you posted. I was also thinking what could be an ideal 1PC
scenario. Do you have any suggestions or have come accross any ideal 1PC scenario you can
think of? I am not looking for a complex scenario. A simple scenario will suffice to
defend the thesis.
Thanks & Regards,
Chirag.
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3:33 a.m.
Paul Robinson [https://community.jboss.org/people/paul.robinson] created the discussion
"Re: Implementing 1PC in WS-AT (WS-Atomic Transaction)"
To view the discussion, visit: https://community.jboss.org/message/826542#826542
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Chirag,
I think you have two use cases, that spring to mind. There may be others if you search the
web.
1) Based on the application logic, the number of services invoked (and thus participants
enlisted) could vary, dependent on input parameters. Therefore, sometimes you will only
get one participant registered, making 2PC unnecessary. Imagine a travel agent, sometimes
a customer will book a flight, hotel and taxi; other times, just a flight.
2) Even if multiple participants are enlisted, I think you can drive the final participant
through 1PC if all previous participants voted "read-only".
I suggest you read the following book [1]. The Web services bit is out of date (describes
old standards), however, the core concepts are still very much current. I always recommend
that my Interns and any new team members read the book. I'd recommend reading chapter
one (Transaction Fundamentals) and ten (Transactions and Web Services) in detail and then
go through the other chapters in an order that interests you. It should give you a solid
understanding of transaction concepts and will give you some good content for your
thesis.
Our transactions blog is also a good source of information [2].
[1]
http://www.amazon.co.uk/Java-Transaction-Processing-Design-Implementation...
http://www.amazon.co.uk/Java-Transaction-Processing-Design-Implementation...
[2] http://jbossts.blogspot.co.uk/ http://jbossts.blogspot.co.uk/
Paul.
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2:14 p.m.
Chirag Rana [https://community.jboss.org/people/chiragr] created the discussion
"Re: Implementing 1PC in WS-AT (WS-Atomic Transaction)"
To view the discussion, visit: https://community.jboss.org/message/826653#826653
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Hello Paul,
Thanks so much for the information. Based on the above given use cases, my understanding
is that we can also consider the ws-at simple example from jboss quickstarts (Restaurant
reservation example) can also be converted into 1PC, if we consider only makebooking() as
the service call. Let me know your thoughts on this use case.
I have order the book which you suggested and will refer to the chapters you have
suggested. Will keep you posted on the progress.
Thanks & Regards,
Chirag.
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7:47 p.m.
Chirag Rana [https://community.jboss.org/people/chiragr] created the discussion
"Re: Implementing 1PC in WS-AT (WS-Atomic Transaction)"
To view the discussion, visit: https://community.jboss.org/message/830603#830603
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Hello Paul,
Just wanted to give you heads up that I am refering to the book you have suggested. It is
a very good source for all the developers and architects who want to design/implement
transaction related applications. Thanks very much. As I am going through the book, I am
also writing thesis prospectus. I will be starting the technical implementation as soon I
am done with couple of chapters from the book. I am also referring to your transaction
blog. It is a good source of information and I am getting pretty clear idea of how
transactions work.
Thanks & Regards,
Chirag.
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3:49 a.m.
Paul Robinson [https://community.jboss.org/people/paul.robinson] created the discussion
"Re: Implementing 1PC in WS-AT (WS-Atomic Transaction)"
To view the discussion, visit: https://community.jboss.org/message/830666#830666
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Chirag,
That's great I'm glad you are finding them of use.
What time frames are you looking at to complete your implementation/thesis?
Paul.
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6:42 p.m.
Chirag Rana [https://community.jboss.org/people/chiragr] created the discussion
"Re: Implementing 1PC in WS-AT (WS-Atomic Transaction)"
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Hello Paul,
I am looking forward to complete by Mid November 2013. According to your experience, how
much time do you think it should take to complete the implementation? I have 10 years of
Portlet development experience and I am currently a full time employee in US.
Thanks & Regards,
Chirag Rana
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