123 lines
4.9 KiB
Plaintext
123 lines
4.9 KiB
Plaintext
---
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layout: docs
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page_title: Jepsen Testing
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sidebar_title: Jepsen Testing
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description: >-
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Jepsen is a tool, written by Kyle Kingsbury, designed to test the partition
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tolerance of distributed systems. It creates network partitions while fuzzing
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the system with random operations. The results are analyzed to see if the
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system violates any of the consistency properties it claims to have.
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---
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# Jepsen Testing
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[Jepsen](http://aphyr.com/posts/281-call-me-maybe-carly-rae-jepsen-and-the-perils-of-network-partitions)
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is a tool, written by Kyle Kingsbury, designed to test the partition
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tolerance of distributed systems. It creates network partitions while fuzzing
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the system with random operations. The results are analyzed to see if the system
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violates any of the consistency properties it claims to have.
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As part of our Consul testing, we ran a Jepsen test to determine if
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any consistency issues could be uncovered. In our testing, Consul
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gracefully recovered from partitions without introducing any consistency
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issues.
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## Running the tests
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At the moment, testing with Jepsen is rather complex as it requires
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setting up multiple virtual machines, SSH keys, DNS configuration,
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and a working Clojure environment. We hope to contribute our Consul
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testing code upstream and to provide a Vagrant environment for Jepsen
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testing soon.
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## Output
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Below is the output captured from Jepsen. We ran Jepsen multiple times,
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and it passed each time. This output is only representative of a single
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run and has been edited for length. Please reach out on [Consul's Discuss](https://discuss.hashicorp.com/c/consul)
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if you would like to reproduce the Jepsen results.
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<!--googleoff: all-->
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```shell-session
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$ lein test :only jepsen.system.consul-test
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lein test jepsen.system.consul-test
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INFO jepsen.os.debian - :n5 setting up debian
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INFO jepsen.os.debian - :n3 setting up debian
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INFO jepsen.os.debian - :n4 setting up debian
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INFO jepsen.os.debian - :n1 setting up debian
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INFO jepsen.os.debian - :n2 setting up debian
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INFO jepsen.os.debian - :n4 debian set up
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INFO jepsen.os.debian - :n5 debian set up
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INFO jepsen.os.debian - :n3 debian set up
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INFO jepsen.os.debian - :n1 debian set up
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INFO jepsen.os.debian - :n2 debian set up
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INFO jepsen.system.consul - :n1 consul nuked
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INFO jepsen.system.consul - :n4 consul nuked
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INFO jepsen.system.consul - :n5 consul nuked
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INFO jepsen.system.consul - :n3 consul nuked
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INFO jepsen.system.consul - :n2 consul nuked
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INFO jepsen.system.consul - Running nodes: {:n1 false, :n2 false, :n3 false, :n4 false, :n5 false}
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INFO jepsen.system.consul - :n2 consul nuked
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INFO jepsen.system.consul - :n3 consul nuked
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INFO jepsen.system.consul - :n4 consul nuked
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INFO jepsen.system.consul - :n5 consul nuked
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INFO jepsen.system.consul - :n1 consul nuked
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INFO jepsen.system.consul - :n1 starting consul
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INFO jepsen.system.consul - :n2 starting consul
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INFO jepsen.system.consul - :n4 starting consul
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INFO jepsen.system.consul - :n5 starting consul
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INFO jepsen.system.consul - :n3 starting consul
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INFO jepsen.system.consul - :n3 consul ready
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INFO jepsen.system.consul - :n2 consul ready
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INFO jepsen.system.consul - Running nodes: {:n1 true, :n2 true, :n3 true, :n4 true, :n5 true}
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INFO jepsen.system.consul - :n5 consul ready
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INFO jepsen.system.consul - :n1 consul ready
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INFO jepsen.system.consul - :n4 consul ready
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INFO jepsen.core - Worker 0 starting
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INFO jepsen.core - Worker 2 starting
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INFO jepsen.core - Worker 1 starting
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INFO jepsen.core - Worker 3 starting
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INFO jepsen.core - Worker 4 starting
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INFO jepsen.util - 2 :invoke :read nil
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INFO jepsen.util - 3 :invoke :cas [4 4]
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INFO jepsen.util - 0 :invoke :write 4
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INFO jepsen.util - 1 :invoke :write 1
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INFO jepsen.util - 4 :invoke :cas [4 0]
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INFO jepsen.util - 2 :ok :read nil
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INFO jepsen.util - 4 :fail :cas [4 0]
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(Log Truncated...)
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INFO jepsen.util - 4 :invoke :cas [3 3]
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INFO jepsen.util - 4 :fail :cas [3 3]
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INFO jepsen.util - :nemesis :info :stop nil
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INFO jepsen.util - :nemesis :info :stop "fully connected"
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INFO jepsen.util - 0 :fail :read nil
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INFO jepsen.util - 1 :fail :write 0
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INFO jepsen.util - :nemesis :info :stop nil
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INFO jepsen.util - :nemesis :info :stop "fully connected"
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INFO jepsen.core - nemesis done
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INFO jepsen.core - Worker 3 done
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INFO jepsen.util - 1 :invoke :read nil
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INFO jepsen.core - Worker 2 done
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INFO jepsen.core - Worker 4 done
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INFO jepsen.core - Worker 0 done
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INFO jepsen.util - 1 :ok :read 3
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INFO jepsen.core - Worker 1 done
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INFO jepsen.core - Run complete, writing
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INFO jepsen.core - Analyzing
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(Log Truncated...)
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INFO jepsen.core - Analysis complete
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INFO jepsen.system.consul - :n3 consul nuked
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INFO jepsen.system.consul - :n2 consul nuked
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INFO jepsen.system.consul - :n4 consul nuked
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INFO jepsen.system.consul - :n1 consul nuked
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INFO jepsen.system.consul - :n5 consul nuked
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1964 element history linearizable. :D
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Ran 1 tests containing 1 assertions.
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0 failures, 0 errors.
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```
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<!--googleon: all-->
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