Re: [platform-dev] Joining on a job belonging to the same group is not s

[John Arthorne <John_Arthorne@xxxxxxxxxx>]

Hi Mickael,

Take a look at the Javadoc for Job#join
methods, they describe in detail why this is not permitted. Essentially
it is a high deadlock risk when combined with job pool throttling. I guess
if there is only one parent it doesn't need to be in the job group, so
it could be excluded from the pool from a job throttling perspective. Even
better would be avoiding join altogether, and go with a fully asynchronous
trigger. For example the body of JobGroup#computeGroupResult can be used
to trigger any post-processing you want to do after all jobs finish, rather
than tying up a thread waiting for the children to complete.

John




From:      
 Mickael Istria <mistria@xxxxxxxxxx>
To:      
 platform-dev@xxxxxxxxxxx
Date:      
 06/18/2015 05:45 AM
Subject:    
   Re: [platform-dev]
Joining on a job belonging to the same group is not supported
Sent by:    
   platform-dev-bounces@xxxxxxxxxxx

---

Hi,

Is this a totally silly idea or should I open an enhancement request ?

On 06/16/2015 12:30 PM, Mickael Istria wrote:
Hi again,

While I'm getting in more details with the JobGroup API, the following
error occured to me "Joining on a job belonging to the same group
is not supported". Although it's pretty explicit and leaves no doubt
about what is forbidden, I fail to understand why this is forbidden. In
my use-case of a deep navigation in a resource tree, I'd like to create
1 job for each child and to have the parent job joining on the completion
of children's job. All those jobs would share the same thread pool, throttling
using JobGroup.

Why isn't it allowed for a job to join on other jobs of the JobGroup?
What would be an alternative for my use-case?

Cheers,

-- 
Mickael Istria
Eclipse developer at JBoss,
by Red Hat
My
blog - My
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