topic Re: Does Job Executor launch Service Tasks more than once? in Alfresco Archive

Does Job Executor launch Service Tasks more than once?

ct1 — Tue, 06 Dec 2011 18:09:11 GMT

I made process for a user to launch in Explorer that polls for a file until it finds it or exceeds a set timelimit. I initially used an IntermediateTimerEvent, but I kept getting exceptions that the time was simultaneously updated by another transaction. So, I wrote a Java class to run in a loop l

Re: Does Job Executor launch Service Tasks more than once?

ronald_van_kuij — Tue, 06 Dec 2011 18:35:19 GMT

This is normal behaviour. The jobexecutor assumes that tasks it needs to run take less time than 5 minutes. If they take longer, it assumes the job is stuck and it re-executes it. Solving the problem the way you do in the java class is kind of wrong… For long running external jobs use the send/receive mechanism.

Ronald

Re: Does Job Executor launch Service Tasks more than once?

keymaster — Fri, 16 Nov 2012 11:43:54 GMT

Hello

and how is the reexecution trigger? It it done by setting then JOB.LOCK_EXP_TIME_ to "now + 5 Min"?

Regards, Wolf

Re: Does Job Executor launch Service Tasks more than once?

frederikherema1 — Fri, 16 Nov 2012 12:27:55 GMT

Yes, it is. The expiration-time can be altered by overriding the Job-executor. Keep in mind, though, that certain databases have a transaction-timeout that may occur when, when transaction is kept open too long when executing the long-running job.

Re: Does Job Executor launch Service Tasks more than once?

keymaster — Sun, 18 Nov 2012 12:34:55 GMT

Hello Frederik,
can you tell me where the DB transaction timeout is configured and how it is set by default for ORACLE.
Regards, Wolf

Re: Does Job Executor launch Service Tasks more than once?

frederikherema1 — Mon, 19 Nov 2012 08:58:19 GMT

keymaster, please google for these settings for oracle, presume it's a property in the datasource configuration/jdbc-url…

Re: Does Job Executor launch Service Tasks more than once?

rajkumarchari82 — Tue, 18 Jun 2013 15:02:50 GMT

Hi Fred,

This might a simple question, please do confirm the below.
I hope the above is the case only with the RUN execution task and not for a wait task(Wait Timer Event definition ) as the sole purpose of to to wait for longer durations than 5mins.

Re: Does Job Executor launch Service Tasks more than once?

jbarrez — Wed, 19 Jun 2013 09:45:37 GMT

wait states (eg receive task) do not keep any transaction open.

Re: Does Job Executor launch Service Tasks more than once?

jvoris — Mon, 16 Jun 2014 20:33:24 GMT

What is the 'send/receive' mechanism? (I'm running into a problem similar to the one described in this thread – on activiti 5.15.1)