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Release Note: http://osrg.github.io/namazu/post/release-0-2-0/ Changes from v0.1.2: * New project name (Earthquake --> Namazu) * New feature: process inspector (useful for reproducing flaky xUnit test failures) * New feature: filesystem inspector (found YARN-4301) * New feature: Container CLI (Docker-like, human-friendly CLI) * New experimental feature: Semi-deterministic replaying API Changes from v0.2.0-rc2: * #146: Reduce CPU consumption * #142: New project name (Earthquake --> Namazu) * #140: Integrate `earthquake-container` to `earthquake` * #139: Support static build * #137: New experimental feature: Semi-deterministic replaying API * #131: New minor feature: Standalone orchestrator * Improvement on docs * Some minor fixes
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| categories = ["blog"] | ||
| date = "2016-05-20" | ||
| tags = ["document"] | ||
| title = "Release Namazu v0.2.0" | ||
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| Note: we recently renamed _Earthquake_ to _Namazu_. | ||
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| We are glad to annouce the release of [Namazu](https://github.com/osrg/namazu) v0.2.0. | ||
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| Namazu v0.2.0 includes many new features: Process inspector, Filesystem inspector, Container CLI, Semi-deterministic replaying API... | ||
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| These new features made Namazu much more powerful and simple. | ||
| Now, no configuration is needed to get started with Namazu. | ||
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| You can download the Namazu v0.2.0 binary release from [github](https://github.com/osrg/namazu/releases/tag/v0.2.0). | ||
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| Or you can also build Namazu manually: | ||
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| $ sudo apt-get install libzmq3-dev libnetfilter-queue-dev | ||
| $ go get github.com/osrg/namazu/nmz | ||
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| ## New features | ||
| ### Process inspector | ||
| The process inspector sets random scheduling priority to threads under a specific Linux process: | ||
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| $ sudo nmz inspectors proc -pid $TARGET_PID -watch-interval 1s | ||
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| The process inspector is sometimes useful when you want to reproduce flaky xUnit tests. | ||
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| The experimental result for Hadoop tests is available in the slide we presented at ApacheCon: | ||
| {{< slideshare key="esat324HuI0vud" slide="41" >}} | ||
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| ### Filesystem inspector | ||
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| The filesystem inspector provides randomized scheduling and fault injection for filesystem using FUSE: | ||
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| $ mkdir /tmp/{nmzfs-orig,nmzfs} | ||
| $ sudo nmz inspectors fs -original-dir /tmp/nmzfs-orig -mount-point /tmp/nmzfs -autopilot config.toml | ||
| $ $TARGET_PROGRAM_WHICH_ACCESSES_TMP_NMZFS | ||
| $ sudo fusermount -u /tmp/nmzfs | ||
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| Using filesystem inspector, we successfully found [YARN-4301](https://issues.apache.org/jira/browse/YARN-4301). | ||
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| {{< slideshare key="esat324HuI0vud" slide="55" >}} | ||
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| ### Container CLI | ||
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| We introduced *Namazu Container*, a new human-friendly, Docker-like CLI: | ||
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| $ sudo nmz container run -it --rm -v /foo:/foo ubuntu bash | ||
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| In *Namazu Container*, you can run arbitrary command that might be *flaky*. | ||
| JUnit tests are interesting to try. | ||
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| nmzc$ git clone something | ||
| nmzc$ cd something | ||
| nmzc$ for f in $(seq 1 1000);do mvn test; done | ||
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| By default, only process inspector is enabled in *Namazu Container*. | ||
| Please refer to [README file](https://github.com/osrg/namazu/blob/master/README.md) for configuration. | ||
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| ### Semi-deterministic replaying API | ||
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| Semi-deterministic replayer is an experimental feature: | ||
| it determines a delay for an event using a seed value and the hash of the event, rather than just using a random value. | ||
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| It does not guarantee full determinism, but we believe it is sometimes enough for debugging. | ||
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| {{< slideshare key="esat324HuI0vud" slide="58" >}} | ||
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| ### Miscellaneous improvements | ||
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| * Renamed Earthquake to Namazu, and introduced a logo image | ||
| * Support static build | ||
| * Unit tests for Namazu itself | ||
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| ## Talks | ||
| Recently, we made presentations at two events: [CoreOS Fest](http://sched.co/6Szb) (May 10) and [ApacheCon Core NA](http://sched.co/6OJU) (May 12). | ||
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| Please refer to the [article]({{< relref "post/coreosfest2016-and-apachecon2016.md" >}}) in our blog. |
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