Supervision for persistent actors

[Muthukumaran Kothandaraman‏]

Hi, 

Context : I have a hierarchy wherein a parent (few levels below root) is a persistent-actor (let us call this as partition-manager (this Id is ensured to be unique). It starts few child actors which are again persistent (let us call them as partition-handler-X where X is some unique number to ensure uniqueness of persistence-id). In addition to partition-handler-X, partition-manager also spawns few regular non-persistent actors

Above scheme works without any issues. 

Problem : Off late we encountered a situation wherein there are very sporadic journal-write failures (using LevelDB plugin). Write-failure may as well be triggered by an environment issue. While we are investigating the same, I also intend to have a level of protection at the actors' level to use Backoff supervision strategy

Clarification : Is it advisable to use Backoff supervisor strategy for partition-manager (parent) as well as partition-handler-X (children) persistent-actors to cope with sporadic journal-write failures without disturbing any other actors of same hierarchy ?

Regards

Muthu

[Muthukumaran Kothandaraman‏]

I understand that child actor inherits the parent's supervision strategy. In that case, for the scenario below, if I specify different strategies for different sibling actors of same hierarchy, which strategy takes precedence. 

For example, I have actor A with supervision strategy as X and actor A spins actors B, C and D. If I use strategy Y for actors B and C. Also, if I use strategy Z for actor actor D, will Y and Z strategies take precedence. Intuitively, I assume that "overriding" strategies can lead to more non-deterministic issues. 

Is my understanding that it is not a good idea to have mixed strategies among siblings correct ?

Regards

Muthu

[Patrik Nordwall‏]

You want to use Backoff supervision here, and that is actually an ordinary actor that takes care of the supervision for one other actor. You have to use a Backoff supervisor for the manager an one for each child. It only supports one-for-one.

/Patrik

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