Re: question about persistence

John McClain - Sun Microsystems, Inc. wrote:
> Suzanne Morelli wrote:
>> Hi,
>>
>> I understand using persistent JavaSpace might help to recover from a
>> fault. But if the fault is more severe than just a problem with the
>> JavaSpace process, it might not be suffisant; for instance, in the case
>> where the machine hosting the JavaSpace crashes totally. In that case,
>> I'd like to restart the JavaSpace, but somewhere else, using the log of
>> the crashed machine...
>> Is it possible to indicate a persitenceDirectory that is not local?
>
> There are two things to worry about. One is can the new incarnation of
> the space recover the state from the old incarnation, the second is can
> clients talk to the new incarnation?
>

[snip]

> One way to address both problems (storage and addressing) is to use some
> sort of clustering solution (e.g. Sun Cluster, I think there are similar
> clustering solution for other operating systems) where you run machines
> in pairs with shared disks. Outrigger runs on one machine, if that
> machine crashes the second machines automatically takes control over the
> disks, takes the first machine's IP address, and restarts Outrigger. (I
> think Dan Creswell had a talk at the 7th Jini Community Meeting about
> doing this sort of thing with Blitz (on Linux?), but if memory serves
> what he did should work with any restartable service (including
> Outrigger)).
>

Yeah, it should work with Outrigger and most other services as well.

The title was:

A Blueprint for Constructing Resilient Stateful Jini Services


Dan.

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