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Switch to safekeeper in the same AZ (#3883)

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Add a condition to switch walreceiver connection to safekeeper that is
located in the same availability zone. Switch happens when commit_lsn of
a candidate is not less than commit_lsn from the active connection. This
condition is expected not to trigger instantly, because commit_lsn of a
current connection is usually greater than commit_lsn of updates from
the broker. That means that if WAL is written continuously, switch can
take a lot of time, but it should happen eventually.

Now protoc 3.15+ is required for building neon.

Fixes https://github.com/neondatabase/neon/issues/3200
This commit is contained in:
Arthur Petukhovsky
2023-04-02 11:32:27 +03:00
committed by GitHub
parent 75ffe34b17
commit 814abd9f84
7 changed files with 117 additions and 16 deletions
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README.md
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@@ -40,6 +40,8 @@ pacman -S base-devel readline zlib libseccomp openssl clang \
postgresql-libs cmake postgresql protobuf
```
Building Neon requires 3.15+ version of `protoc` (protobuf-compiler). If your distribution provides an older version, you can install a newer version from [here](https://github.com/protocolbuffers/protobuf/releases).
2. [Install Rust](https://www.rust-lang.org/tools/install)
```
# recommended approach from https://www.rust-lang.org/tools/install