[infinispan-dev] distributed execution - invoking commands on self

[Sanne Grinovero]

2011/4/11 Vladimir Blagojevic <vblagoje at redhat.com>:
> Hi,
>
> I discovered a problem with distributed framework in cases where
> Callables submitted for distributed execution contain mutable instance
> fields. Just before Callable is dispersed across cluster it gets invoked
> locally where instance fields of a submitted Callable can be possibly
> mutated; Callable is in turn sent to remote nodes with mutated values
> instead of "original" field values as submitted by user. For example,
> consider pi approximation example from wiki [1]. If CircleTest Callable
> declared insideCircleCount as an instance field instead of local field
> of call method we would ultimately get a wrong final result.
>
> Therefore we need to ensure that each Infinispan node gets an unmodified
> instance of Callable for execution. I was looking at the possibility to
> send command to self thus causing creation of a marshaled copy of a
> Callable, pretty much like any other remote node receives it. However, I
> was unable to invoke a command on self. Any way to do this? How about
> invoking marshaling locally to create a Callable copy without going
> through rpc invocation layer? I though about skipping master/self node
> altogether but that's an easy way out;-)
>
> Got suggestions, ideas?

Hi Vladimir,
I've no clue about invoking a marshalled command on self, but could
you not just make sure the local callable is being processed *after*
you have created a serialized copy (sent it to others) ?

Regards,
Sanne

>
> Regards,
> Vladimir
>
>
> [1] http://community.jboss.org/wiki/InfinispanDistributedExecutionFramework
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