URGENT - Middle of transaction fail over ?!

Question

          Lets say there is a cluster which contains 2 nodes. If node A is processing a transaction
          and the node A goes down in the middle of the transaction. How can it be continued
          in node B ?
          Will node B 're-start' the whole transaction ? or continue the transaction ? Or the
          end user will receive an error but it will work again if the user click the button
          again ?
          thanks :)
          

Answer 1

          Hi Friends,
          Just want to make sure that the following scenario is correct:
          1 : There is a function called "insertCustomer" which contains 2 database access
          called into 2 different database.
          2 : If instance A is processing insertCustomer's first database call which inserting
          a new record into the database A successfully.
          3 : If instance A goes down when inserting another new record into another database
          B. (assume 2-phase commit approach)
          4 : The instance B will take over the 'process'.
          5 : What will instance B do is that rollback the transaction and retry if it is marked
          as idempotent.
          Is that correct ??
          thanks
          Rajesh Mirchandani <[email protected]> wrote:
          >I think kumar meant
          >http://edocs.beasys.com/wls/docs70/ejb/reference.html#1266364.
          >
          >For WLS 6.1 -- http://edocs.bea.com/wls/docs61/ejb/reference.html#1196142
          >
          >Kumar Allamraju wrote:
          >
          >> http://bernal.beasys.com/stage/docs70/ejb/reference.html#1266364
          >>
          >> Friend wrote:
          >>
          >> > Where can I mark it as idempotent ?
          >> >
          >> > many thanks :)
          >> >
          >> > "Cameron Purdy" <[email protected]> wrote:
          >> >
          >> >>Typically the transaction will be rolled back and the whole request
          >will
          >> >>be
          >> >>retried if it is marked as idempotent.
          >> >>
          >> >>Peace,
          >> >>
          >> >>Cameron Purdy
          >> >>Tangosol, Inc.
          >> >>http://www.tangosol.com/
          >> >>
          >> >>"Friend" <[email protected]> wrote in message
          >> >>news:[email protected]...
          >> >>
          >> >>>Lets say there is a cluster which contains 2 nodes. If node A is
          >> >>>
          >> >>processing a transaction
          >> >>
          >> >>>and the node A goes down in the middle of the transaction. How can
          >it
          >> >>>
          >> >>be
          >> >>continued
          >> >>
          >> >>>in node B ?
          >> >>>Will node B 're-start' the whole transaction ? or continue the transaction
          >> >>>
          >> >>? Or the
          >> >>
          >> >>>end user will receive an error but it will work again if the user click
          >> >>>
          >> >>the button
          >> >>
          >> >>>again ?
          >> >>>
          >> >>>thanks :)
          >> >>>
          >> >>
          >> >
          >
          >--
          >Rajesh Mirchandani
          >Developer Relations Engineer
          >BEA Support
          >
          >