[wildfly-dev] Transactions requirement during the graceful shutdown

[Michael Musgrove]

On Wed, Jul 6, 2016 at 12:00 AM, Stuart Douglas <stuart.w.douglas at gmail.com>
wrote:

> Local transaction creation has to be allowed during graceful shutdown.
> e.g. if a web request is in the process of running and it attempts to start
> a transaction this must be allowed (the core requirement of graceful
> shutdown is that requests that have already been accepted continue to run
> as normal).
>
> The only case when transactions should be disallowed are remote
> transactions, such as remote EJB and CORBA, which I think should already be
> dealt with at the respective endpoints (in terms of disallowing new
> transaction creation). I think the main thing that needs consideration here
> is what to do with EJB requests that would otherwise be rejected that are
> part of an existing remote transaction. We probably need some way of
> identifying these requests and allowing them to proceed.
>

Such requests will result in us creating a subordinate transaction on the
shutting down server. If we allow these requests then we may never be able
to shut down the transaction system but on the other hand if there isn't
much traffic then we should allow the remote transaction to continue.
Therefore I think we should make the behaviour configurable.

Mike


>
> Stuart
>
>
>
> On Mon, Jul 4, 2016 at 11:11 PM, Gytis Trikleris <gtrikler at redhat.com>
> wrote:
>
>> Hello,
>>
>> I’m in the process of writing an analysis document for
>> https://issues.jboss.org/browse/EAP7-459 and need your input.
>> Specifically I’m looking for the list of subsystems which might need to
>> create new transactions during the graceful shutdown. Normally new
>> transactions would not be allowed then, but this might stop other
>> subsystems to shutdown properly. If such subsystems exist we’ll need to
>> think of the way how to filter out their requests (e.g. providing SPI for
>> them).
>>
>> Thanks,
>> Gytis
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>
>
>
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-- 
Michael Musgrove
Transactions Team
e: mmusgrov at redhat.com
t: +44 191 243 0870

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