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storcon: change default stripe size to 16 MB (#11168)

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## Problem

The current stripe size of 256 MB is a bit large, and can cause load
imbalances across shards. A stripe size of 16 MB appears more reasonable
to avoid hotspots, although we don't see evidence of this in benchmarks.

Resolves https://github.com/neondatabase/cloud/issues/25634.
Touches https://github.com/neondatabase/cloud/issues/21870.

## Summary of changes

* Change the default stripe size to 16 MB.
* Remove `ShardParameters::DEFAULT_STRIPE_SIZE`, and only use
`pageserver_api::shard::DEFAULT_STRIPE_SIZE`.
* Update a bunch of tests that assumed a certain stripe size.
This commit is contained in:
Erik Grinaker
2025-04-09 10:41:38 +02:00
committed by GitHub
parent cf62017a5b
commit a6ff8ec3d4
9 changed files with 98 additions and 93 deletions
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docs/storage_controller.md
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@@ -151,7 +151,7 @@ Example body:
```
{
"tenant_id": "1f359dd625e519a1a4e8d7509690f6fc",
"stripe_size": 32768,
"stripe_size": 2048,
"shards": [
{"node_id": 344, "shard_number": 0},
{"node_id": 722, "shard_number": 1},