01915a725e
File watches have been a source of complexity and unreliability in the LogFile follow implementation, especially when combined with file rotation. File change events can be unreliably delivered, especially on Windows, and the polling fallback adds latency. Following across rotations has never worked reliably on Windows. Without synchronization between the log writer and readers, race conditions abound: readers can read from the file while a log entry is only partially written, leading to decode errors and necessitating retries. In addition to the complexities stemming from file watches, the LogFile follow implementation had complexity from needing to handle file truncations, and (due to a now-fixed bug in the polling file watcher implementation) evictions to unlock the log file so it could be rotated. Log files are now always rotated, never truncated, so these situations no longer need to be handled by the follow code. Rewrite the LogFile follow implementation in terms of waiting until LogFile notifies it that a new message has been written to the log file. The LogFile informs the follower of the file offset of the last complete write so that the follower knows not to read past that, preventing it from attempting to decode partial messages and making retries unnecessary. Synchronization between LogFile and its followers is used at critical points to prevent missed notifications of writes and races between file rotations and the follower opening files for read. Signed-off-by: Cory Snider <csnider@mirantis.com> |
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The Moby Project
Moby is an open-source project created by Docker to enable and accelerate software containerization.
It provides a "Lego set" of toolkit components, the framework for assembling them into custom container-based systems, and a place for all container enthusiasts and professionals to experiment and exchange ideas. Components include container build tools, a container registry, orchestration tools, a runtime and more, and these can be used as building blocks in conjunction with other tools and projects.
Principles
Moby is an open project guided by strong principles, aiming to be modular, flexible and without too strong an opinion on user experience. It is open to the community to help set its direction.
- Modular: the project includes lots of components that have well-defined functions and APIs that work together.
- Batteries included but swappable: Moby includes enough components to build fully featured container system, but its modular architecture ensures that most of the components can be swapped by different implementations.
- Usable security: Moby provides secure defaults without compromising usability.
- Developer focused: The APIs are intended to be functional and useful to build powerful tools. They are not necessarily intended as end user tools but as components aimed at developers. Documentation and UX is aimed at developers not end users.
Audience
The Moby Project is intended for engineers, integrators and enthusiasts looking to modify, hack, fix, experiment, invent and build systems based on containers. It is not for people looking for a commercially supported system, but for people who want to work and learn with open source code.
Relationship with Docker
The components and tools in the Moby Project are initially the open source components that Docker and the community have built for the Docker Project. New projects can be added if they fit with the community goals. Docker is committed to using Moby as the upstream for the Docker Product. However, other projects are also encouraged to use Moby as an upstream, and to reuse the components in diverse ways, and all these uses will be treated in the same way. External maintainers and contributors are welcomed.
The Moby project is not intended as a location for support or feature requests for Docker products, but as a place for contributors to work on open source code, fix bugs, and make the code more useful. The releases are supported by the maintainers, community and users, on a best efforts basis only, and are not intended for customers who want enterprise or commercial support; Docker EE is the appropriate product for these use cases.
Legal
Brought to you courtesy of our legal counsel. For more context, please see the NOTICE document in this repo.
Use and transfer of Moby may be subject to certain restrictions by the United States and other governments.
It is your responsibility to ensure that your use and/or transfer does not violate applicable laws.
For more information, please see https://www.bis.doc.gov
Licensing
Moby is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.