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From Chip Childers <>
Subject Re: how is failure detection achieved in cloudstack?
Date Tue, 09 Apr 2013 13:20:45 GMT
On Tue, Apr 09, 2013 at 01:45:24PM +0200, Alejandro Z. Tomsic wrote:
> I would like to know how the process of failure detection is achieved in
> cloudStack (if any). I would like to know about the implementation details,
> i.e. if its done at physical, virtual machine or at application level. Does
> cloudStack use any known failure detection mechanisms? e.g. [1][2][3][4] or
> any other. Where can I find this information?

Failure detection of *what*?

There is a feature to enable "HA" (which is incorrectly named frankly)
for certain compute offerings.  When that feature is enabled, and the
underlying host dies, the affected VMs will be restarted on another

> Thank you in advance.
> Alejandro
> [1] M.Bertier,O.Marin,andP.Sens.Implementation and performance evaluation
> of an adaptable failure detector. In International Conference on Dependable
> Systems and Networks (DSN), pages 354–363, June 2002.
> [2] W. Chen, S. Toueg, and M. K. Aguilera. On the quality of service of
> failure detectors. IEEE Transactions on Computers, 51(5):561–580, May 2002.
> [3] N. Hayashibara, X. De ́fago, R. Yared, and T. Katayama. The φ accrual
> failure detector. In IEEE Symposium on Reliable Distributed Systems (SRDS),
> pages 66–78, Oct. 2004.
> [4] Joshua B. Leners, Hao Wu, Wei-Lun Hung, Marcos K. Aguilera, and Michael
> Walfish. 2011. Detecting failures in distributed systems with the Falcon
> spy network. In Proceedings of the Twenty-Third ACM Symposium on Operating
> Systems Principles (SOSP '11). ACM, New York, NY, USA, 279-294.

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