[jbossts-issues] [JBoss JIRA] (JBTM-1573) Transaction timeout incompatible with block forever

[Tom Jenkinson (JIRA)]

     [ https://issues.jboss.org/browse/JBTM-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tom Jenkinson updated JBTM-1573:
--------------------------------
    Issue Type: Enhancement  (was: Bug)


> Transaction timeout incompatible with block forever
> ---------------------------------------------------
>
>                 Key: JBTM-1573
>                 URL: https://issues.jboss.org/browse/JBTM-1573
>             Project: JBoss Transaction Manager
>          Issue Type: Enhancement
>          Components: BlackTie
>            Reporter: Tom Jenkinson
>         Attachments: blocking call.log
>
>
> Currently we set a transaction timeout (e.g. in TestRollbackOnly.cxx we call tx_set_transaction_timeout)
> This ends up putting a timetolive on the message of the same duration.
> Now, if this message is not received within the period of time it will expire.
> However we also use a block forever waiting for the response.
> This can lead to a call never returning.
> i.e.
> server advertises queue
> client sends message with small timeout (e.g. 4) and then blocks forever waiting response
> server gets round to advertising queue 5 seconds later but never sees the clients initial request
> client is blocked forever
> I realise that we are meant to block forever when a client issues a tpcall under transactional conditions but something needs to be done as this can easily happen on slow machines?
> Perhaps we need to make use of the DLQ to wake up the blocked client with an error message??
> Perhaps the client doesn't block forever and just calls txrollback if nothing is heard back??



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