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

[Vladimir Blagojevic]

Yeah, it would be too strict to require Callable to be Cloneable so I 
would opt out to serialization/deserialization as a clone method.

Galder, do out have a recommended mechanism for this in your marshalers?

Thanks Mircea

On 11-04-12 12:59 PM, Mircea Markus wrote:
> 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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