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

[Mircea Markus]

can't you run the Callable locally on a clone of it? If Callable is Clonable then clone it in an orthodox manner, otherwise clone it by serializing/deseralizing it. 

On 11 Apr 2011, at 19:58, Vladimir Blagojevic wrote:
> Sanne,
> 
> I thought about that as well but I do not see a way to ensure that all 
> other commands have been sent to other nodes other than waiting for 
> corresponding futures to return from get and then invoke locally in a 
> serial fashion.
> 
> I do not see a hook anywhere that will tell me when a command has been 
> dropped on the wire!
> 
> Vladimir
> 
> 
> On 11-04-11 2:21 PM, Sanne Grinovero wrote:
>> 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) ?
>> 
> 
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