Summary:
D22206317 (9a6ed4b6ca) added requesting of predecessor information for suspected primordials
by the successor ID. This allows recovery of earlier predecessors when partial
data upload resulted in the history of a commit being extended backwards.
Unfortunately, while the individual requests are fast, the combined request
using `OR` in SQL ended up being very slow for some requests.
Separate out the requests at the application level, and aggregate the results
by concatenating them. `collect_entries` already handles duplicates should any
arise.
Most of the time the successor query will very quickly return no rows, as
it only matters when history is extended backwards, which is expected to be
rare.
Reviewed By: ikostia
Differential Revision: D22456062
fbshipit-source-id: 1e6094b4ac1590a5824e9ae6ef48468766560188
Mononoke is a next-generation server for the Mercurial source control
system, meant to scale up to accepting
thousands of commits every hour across millions of files. It is primarily
written in the Rust programming language.
Caveat Emptor
Mononoke is still in early stages of development. We are making it available now because we plan to
start making references to it from our other open source projects.
The version that we provide on GitHub does not build yet.
This is because the code is exported verbatim from an internal repository at Facebook, and
not all of the scaffolding from our internal repository can be easily extracted. The key areas
where we need to shore things up are:
Full support for a standard cargo build.
Open source replacements for Facebook-internal services (blob store, logging etc).
The current goal is to get Mononoke working on Linux. Other Unix-like OSes may
be supported in the future
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