[jira] [Created] (ODE-1048) Disable MEX_MATCHER job

["Sathwik Bantwal Premakumar (JIRA)" <ji...@apache.org>]

Sathwik Bantwal Premakumar created ODE-1048:
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             Summary: Disable MEX_MATCHER job
                 Key: ODE-1048
                 URL: https://issues.apache.org/jira/browse/ODE-1048
             Project: ODE
          Issue Type: Bug
          Components: BPEL Runtime
            Reporter: Sathwik Bantwal Premakumar
            Assignee: Sathwik Bantwal Premakumar
             Fix For: 1.3.7


MEX_MATCHER job is triggered after registering an Early arriving message. 

Early arriving messages are normally  picked up when the MATCHER job executes. MEX_MATCHER is an overhead and there is lot of contention seen between MATCHER and MEX_MATCHER jobs under load.

There is deadlock situation arising between MEX_MATCHER and MATCHER jobs running concurrently.

MEX_MATCHER
1) lockPrimieMessages (locks all records in BPEL_UNMATCHED using the mex)

MATCHER
1) findRoute (locks route in BPEL_SELECTOR based on single correlation key set canonical value)

MEX_MATCHER
2) tries to findRoute (locked by Matcher)

MATCHER
2) tries to dequeueMessage (locked by Mex_Matcher)

Results in a deadlock.

Possible solution to overcome this deadlock:
Move the dequeueMessage call above the findRoute call in matcherEvent.

This is a proposal to deactivate MEX_MATCHER jobs. Henceforth, MEX_MATCHER jobs will not be triggered after an early message is registered.

In case MEX_MATCHER is necessary, kindly revert the changes done in  this ticket.



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