Automatic Assessment of Failure Recovery in Erlang Applications

Automatic Assessment of Failure Recovery in Erlang Applications Jan Henry Nyström [email_address]

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Why is fault tolerance important ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How can we achieve fault tolerance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How can we achieve fault tolerance ,[object Object],[object Object],[object Object],[object Object]

How do we do fault tolerance in Erlang ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How do we do fault tolerance in Erlang (OTP) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Supervisor s Workers

How do we do fault tolerance in Erlang (Real Life) ,[object Object],"We are extremely pleased with the outcome of the initial phase of this project. This is a major step in the phased development of what we believe is a world-leading Next Generation Network," said Richard Newman, General Manager of Planning and Delivery of Network Transport at BT Wholesale. Ericsson Press Release 5 July, 2002 “ As a matter of fact, the network performance has been so reliable that there is almost a risk that our field engineers do not learn maintenance skills ” Bert Nilsson, Director NGS-Programs Ericsson Ericsson Contact, Issue 19 2002 “ Since cut-over of the first nodes in BT’s network in January 2002, only one minor fault has occurred, resulting in 99.9999999% availability.”

So what is the problem with that then? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A solution to the problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Extracting the information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Extracting the information (Take 2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Extracting the information (In practice) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Extracting the information (In practice) ,[object Object],[object Object],[object Object],[object Object]

Extracting the information (In practice) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What do we do with the information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What do we do with the information ,[object Object],[object Object]

What do we do with the information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What do we do with the information ,[object Object],[object Object],[object Object]

What do we do with the information ,[object Object],[object Object],[object Object],[object Object],[object Object]

Correctness concerns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The tool ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Further reading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Automatic Assessment of Failure Recovery in Erlang Applications

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Automatic Assessment of Failure Recovery in Erlang Applications