Embracing and Extending Git, Push Notifications Harmful
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Git Has A New Wire Protocol Yielding Much Greater Performance
The Git Protocol Version 2 was announced today by Google as a major update to the distributed revision control system's wire protocol. Git protocol version 2 is much more efficient and yields significant performance benefits.
The new Git wire protocol offers server-side filtering for references, easy extensibility for new features, and simplified client handling of the HTTP transport.
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Introducing Git protocol version 2
Today we announce Git protocol version 2, a major update of Git's wire protocol (how clones, fetches and pushes are communicated between clients and servers). This update removes one of the most inefficient parts of the Git protocol and fixes an extensibility bottleneck, unblocking the path to more wire protocol improvements in the future.
The protocol version 2 spec can be found here.
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We recently rolled out support for protocol version 2 at Google and have seen a performance improvement of 3x for no-op fetches of a single branch on repositories containing 500k references. Protocol v2 has also enabled a reduction of 8x of the overhead bytes (non-packfile) sent from googlesource.com servers. A majority of this improvement is due to filtering references advertised by the server to the refs the client has expressed interest in.
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Push Notifications Considered Harmful
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