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pageserver: add page_trace API for debugging (#10293)

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## Problem

When a pageserver is receiving high rates of requests, we don't have a
good way to efficiently discover what the client's access pattern is.

Closes: https://github.com/neondatabase/neon/issues/10275

## Summary of changes

- Add
`/v1/tenant/x/timeline/y/page_trace?size_limit_bytes=...&time_limit_secs=...`
API, which returns a binary buffer.
- Add `pagectl page-trace` tool to decode and analyze the output.

---------

Co-authored-by: Erik Grinaker <erik@neon.tech>
This commit is contained in:
John Spray
2025-01-15 19:07:22 +00:00
committed by GitHub
parent efaec6cdf8
commit fb0e2acb2f
10 changed files with 199 additions and 3 deletions
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4
libs/pageserver_api/src/key.rs
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@@ -24,7 +24,9 @@ pub struct Key {
/// When working with large numbers of Keys in-memory, it is more efficient to handle them as i128 than as
/// a struct of fields.
#[derive(Clone, Copy, Hash, PartialEq, Eq, Ord, PartialOrd, Serialize, Deserialize, Debug)]
#[derive(
Clone, Copy, Default, Hash, PartialEq, Eq, Ord, PartialOrd, Serialize, Deserialize, Debug,
)]
pub struct CompactKey(i128);
/// The storage key size.