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In #12458 we added an in-memory connection buffer so that template runners that want access to the Nomad API for Service Registration and Variables can communicate with Nomad without having to create a real HTTP client. The size of this buffer (1 MiB) was taken directly from its usage in Vault, and each connection makes 2 such buffers (send and receive). Because each template runner has its own connection, when there are large numbers of allocations this adds up to significant memory usage. The largest Nomad Variable payload is 64KiB, and a small amount of metadata. Service Registration responses are much smaller, and we don't include check results in them (as Consul does), so the size is relatively bounded. We should be able to safely reduce the size of the buffer by a factor of 10 or more without forcing the template runner to make multiple read calls over the buffer. Fixes: #18508
4 lines
111 B
Plaintext
4 lines
111 B
Plaintext
```release-note:improvement
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template: reduce memory usage associated with communicating with the Nomad API
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```
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