[JBoss JIRA] (JBTM-3331) LRA end should not return internal server error when precondition fails as it's considered behaviour by spec
1:07 p.m.
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https://issues.redhat.com/browse/JBTM-3331?page=com.atlassian.jira.plugin...
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Ondrej Chaloupka edited comment on JBTM-3331 at 7/1/20 7:05 AM:
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This report is not about the TCK test failure and it's not meant to fix the TCK
instability by changing the implementation. The reference to the TCK tests only provides
the context for when the behaviour can be observed.
When the situation which was causing the TCK failures happen then Narayana does not behave
in the deterministic and correct(...?) way. The scenario is:
* client calls to the {{@LRA}} method (the participant)
* the filter causes the LRA is started
* LRA defines short timeout and the LRA is timeouted
* the filter tries to enlist the participant to LRA. As the LRA was cancelled the
enlistment fails.
Now the follow up code call goes to the method {{NarayanaLRAClient#endLRA}}. It's
because the filter comes there was some failure and thus it tries to end (cancel) it. The
result of the {{endLRA}} method influences the return/error code that the client receives
(aka. client called the `@LRA` method and now it's still waiting for the response from
that call at this point).
If the coordinator already lost the notion about the LRA instance then the {{endLRA}} will
return a different exception code and the filter processing returns to client {{412}} or
{{500}}.
First, the behaviour is quite variable while I think the client should be receiving only
{{412}} in all cases. I'm not sure right now if the {{500}} is strictly against the
spec but I think it is not correct for this scenario.
was (Author: ochaloup):
This report is not about the TCK test failure and it's not meant to fix the TCK
instability by changing the implementation. The reference to the TCK tests only provides
the context for when the behaviour can be observed. As said it's _the related
behaviour of the Narayana implementation_.
When the situation which was causing the TCK failures happen then Narayana does not behave
in the deterministic and correct(...?) way. The scenario is:
* client calls to the {{@LRA}} method (the participant)
* the filter causes the LRA is started
* LRA defines short timeout and the LRA is timeouted
* the filter tries to enlist the participant to LRA. As the LRA was cancelled the
enlistment fails.
Now the follow up code call goes to the method {{NarayanaLRAClient#endLRA}}. It's
because the filter comes there was some failure and thus it tries to end (cancel) it. The
result of the {{endLRA}} method influences the return/error code that the client receives
(aka. client called the `@LRA` method and now it's still waiting for the response from
that call at this point).
If the coordinator already lost the notion about the LRA instance then the {{endLRA}} will
return a different exception code and the filter processing returns to client {{412}} or
{{500}}.
First, the behaviour is quite variable while I think the client should be receiving only
{{412}} in all cases. I'm not sure right now if the {{500}} is strictly against the
spec but I think it is not correct for this scenario.
LRA end should not return internal server error when precondition
fails as it's considered behaviour by spec
------------------------------------------------------------------------------------------------------------
Key: JBTM-3331
URL: https://issues.redhat.com/browse/JBTM-3331
Project: JBoss Transaction Manager
Issue Type: Bug
Components: LRA
Affects Versions: 5.10.5.Final
Reporter: Ondrej Chaloupka
Assignee: Ondrej Chaloupka
Priority: Critical
I've spent some time with https://issues.redhat.com/browse/JBTM-3318 recently and I
have a doubt about behaviour of the LRA. The JBTM-3318 consists of race condition on
starting/enlisting/timeouting the LRA.
The same issue makes failing the `TckTests#timeLimit` and
`TckRecoveryTests#testCancelWhenParticipantIsUnavailable` on our slow AMS CI.
I don't want to talk now about the TCK failure but about the related behaviour of the
Narayana implementation.
The LRA participant defines the {{timeLimit}}
(https://github.com/eclipse/microprofile-lra/blob/1.0-M1/tck/src/main/java...).
And what happens is that the client (TCK test) calls the LRA method, the JAX-RS filter
starts a LRA on coordinator, meanwhile the timeout limit elapses, the JAX-RS filter tries
to enlist the LRA participant to started LRA but it fails as the LRA was cancelled because
of timeout.
Now. The possible non-deterministic Narayana behaviour is that in case of failure on LRA
participant enlistment the client may or may not get internal server error.
It's because the LRA in timeouted state on client is tried to be cancelled (see
https://github.com/jbosstm/narayana/blob/5.10.5.Final/rts/lra/lra-client/...).
The {{NarayanaLRAClient#endLRA}} tries to cancel the LRA. But as the coordinator
timeouted the LRA then now depends if recovery already removed the LRA or not. If the LRA
was not removed yet then {{412, PRECONDITION FAILED}} is returned. If the recovery made it
then {{404, NOT FOUDN}} is returned.
Now the {{endLRA}} considers the {{404}} as not a failure that is considered as {{500,
INTERNAL SERVER ERROR}} while the {{412, PRECONDITION FAILED}} is considered as internal
server error. That should not be that way as the LRA spec considers {{412}} as
"correct" error (see
https://github.com/eclipse/microprofile-lra/blob/1.0-M1/api/src/main/java...).
Such an anticipated return state should not be reported to client as {{500}} - {{internal
server error}}.
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