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Align cutover downloads with heatmap

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John Spray
2023-09-27 09:16:36 +01:00
parent 689b6f14b7
commit a8143a3bed
1 changed files with 3 additions and 2 deletions
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5
docs/rfcs/028-pageserver-migration.md
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@@ -151,7 +151,8 @@ the pageservers' APIs:
1. Call to Node A requesting it to flush to S3 and enter AttachedStale state
2. Increment generation, and call to Node B requesting it to enter AttachedMulti
state with the new generation.
3. Call to Node B, requesting it to download the latest image layers from remote storage.
3. Call to Node B, requesting it to download the latest hot layers from remote storage,
according to the latest heatmap flushed by Node A.
4. Wait for Node B's WAL ingestion to catch up with node A's
5. Update endpoints to use node B instead of node A
6. Call to node B requesting it to enter state AttachedSingle.
@@ -214,7 +215,7 @@ participant E as Endpoint
CP->>A: PUT Flush & go to AttachedStale
note right of A: A continues to ingest WAL
CP->>B: PUT AttachedMulti
CP->>B: PUT Download image layers
CP->>B: PUT Download layers from latest heatmap
note right of B: B downloads from S3
loop Poll until download complete
CP->>B: GET download status