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[DRAFT] Optimize query-path caching/memoization - #1003

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cache-getLatestLedger
Oct 2, 2026
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cache-getLatestLedger

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@cjonas9 cjonas9 commented Sep 11, 2026 •

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Superseded by #1060. GitHub auto-closed this PR as merged into bypass-jrpc2-marshal when the stack was reordered to put this change first; no code reached feature/full-history from here. The same commits are under review in #1060.

What

Adds latestMemo[T] in methods/latest_memo.go, an atomic pointer to a {seq, value} entry plus a miss mutex. A new ledger invalidates it by moving the key, so there is no ingestion hook.
This is used so that...

  • getLatestLedger memoizes its rendered response.** The fully rendered JSON is cached keyed by ledger sequence.
  • getNetwork and getVersionInfo also benefit from this, as getProtocolVersion now memoizes the result by sequence with the same latestMemo.

You can compare the optimized performance seen in coordinator runs here to the base perf measured in #1018. The results in the coordinator runs here include all recent optimization work -- XDR views adoption (#945, #962, #941, #1035, all validated by tests in #976, #982), as well as more recent tangential optimizations (see the stack, particularly #1036, 1037, and this PR).

Measurements

Handler-level, from the perf-eval go-bench leg on this branch (pubnet-sized ledger):

time B/op allocs/op
GetLatestLedger, uncached 8.8 ms 11.2 MiB 40
GetLatestLedger, cached 1.06 µs 164 B 5

getNetwork over the pubnet sqlite fixture (BenchmarkLedgerReads harness; v1 sqlite / v2 hot). getVersionInfo tracks it within noise:

time B/op allocs/op
before 4.2 ms / 4.4 ms 10.5 MB / 9.2 MB 103,000
header view read 175 µs / 264 µs 1.5 MB / 8.7 KB ~200
view + memo 10 µs / 13 µs 5 KB / 6 KB ~120

The memo row is getHealth cost. The 103K allocations per call were what made these endpoints fold under concurrency.

Tests

  • getLatestLedger: serves the memo until the ledger advances, an older view does not evict a newer render, 32 concurrent misses render once, errors are not memoized, and the rendered bytes are byte-equal to marshaling the response struct.
  • Protocol version: same memo behaviour, plus getNetwork doing one raw read across two requests.
  • BenchmarkGetLatestLedger gained cached and uncached rows.

Why

getLatestLedger, getNetwork and getVersionInfo are what SDKs and wallets poll continuously, and they were the first endpoints to buckle under load even though their answers change once per ledger. Proportionate to what they return, they were made needlessly expensive because every request touched the 2 MB latest ledger. This is a full decode for one field or a base64 render of the whole thing.

Additionally, the jhttp bridge added a client/server round trip that re-parsed multi-megabyte results, about 65% of end-to-end time. Anything that only changes when the ledger sequence changes can be memoized by sequence with no invalidation plumbing, and one memo shape covers every "fact about the latest ledger". The response-path fix belongs inside jrpc2 rather than in a parallel dispatcher, hence the fork.

Known limitations / additional notes

  • Depends on a jrpc2 fork. stellar-experimental/jrpc2@raw-message-passthrough is four commits ahead of upstream. Upstream, vendor or keep the fork is an open decision.
  • Supercedes jsonrpc: own the response envelope — one marshal, one write; the jhttp bridge retires #969 (own the response envelope, retire the bridge). Both remove the bridge round trip and only one should land. They perform the same on struct results; they differ on json.RawMessage results and in how the handler context is built.
  • simulateTransaction still has the old pattern. getLatestLedgerPreflightInfo full-decodes the latest ledger for three header fields. The same view read applies; left for a follow-up.
  • Per-handler memos, not one shared cache. getLatestLedger, getNetwork and getVersionInfo each hold their own. A shared one would need wiring through specs.go, and a getNetwork miss would then either trigger the 2 MB render or need per-field laziness.

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🧪 Performance Evaluation Test #11

Commit: 7af387ac1ed6 (cache-getLatestLedger)
Run: https://github.com/stellar/stellar-rpc/actions/runs/36772356967

✅ Backfill ingestion — verdict: ok

⏳ Backfill ingestion — 7af387ac1ed6

Metric Value
Ledgers ingested 120960 ([64583552 -> 64704511])
Retention window 120960
Wall-clock (total) 2h41m9s
Ingest phase 2h14m4s
Bulk-load finalize phase 27m5s
Ledgers/sec (ingest) 15.0

✅ Endpoint load test — verdict: ok

🎯 Endpoint load test — 7af387ac1ed6

Serial blast per endpoint (ramp-up 1m, duration 3m, error kill switch 75%, blaster aadc1a17595f) against the backfilled RPC (ledgers [64584266, 64705225], handoff wait 1351s).

Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents 75 11224 7 (0.1%) 0.8 11.6 30.5 3909.6
getFeeStats 250 37493 0 (0.0%) 0.4 0.5 0.6 1.0
getHealth 250 37493 0 (0.0%) 0.4 0.5 0.6 1.2
getLatestLedger 15 2244 0 (0.0%) 7.2 10.7 25.1 33.2
getLedgers (limit=5) 3 440 0 (0.0%) 183.2 1417.2 1828.9 2061.3
getNetwork 100 14978 0 (0.0%) 0.5 0.6 0.7 3.5
getTransaction 75 11225 0 (0.0%) 5.8 12.8 20.2 27.2
getTransactions (limit=200) 10 1474 0 (0.0%) 21.3 321.0 384.3 453.1
getVersionInfo 100 14782 0 (0.0%) 0.4 0.5 0.6 3.3
getEvents results extended
Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents/catch-up 3 460 0 (0.0%) 3.7 21.2 36.5 68.4
getEvents/deep-pager 17.25 2525 0 (0.0%) 0.7 21.2 159.1 1666.0
getEvents/deep-scan 2.25 356 2 (0.6%) 0.7 6.8 11.6 10002.4
getEvents/firehose 1.5 242 0 (0.0%) 0.7 2.5 4.5 23.5
getEvents/head-poll 36 5441 0 (0.0%) 0.8 7.0 11.2 67.6
getEvents/tail-poll 9 1278 5 (0.4%) 0.7 0.9 1069.1 10002.4
getEvents/transfer-watcher 6 922 0 (0.0%) 7.9 18.3 22.4 26.8
Performance Evaluation Test #10

🧪 Performance Evaluation Test #10

Commit: 190e08d28bb5 (cache-getLatestLedger)
Run: https://github.com/stellar/stellar-rpc/actions/runs/36183403938

✅ Backfill ingestion — verdict: ok

⏳ Backfill ingestion — 190e08d28bb5

Metric Value
Ledgers ingested 120960 ([64496896 -> 64617855])
Retention window 120960
Wall-clock (total) 2h39m24s
Ingest phase 2h11m48s
Bulk-load finalize phase 27m36s
Ledgers/sec (ingest) 15.3

✅ Endpoint load test — verdict: ok

🎯 Endpoint load test — 190e08d28bb5

Serial blast per endpoint (ramp-up 1m, duration 3m, error kill switch 75%, blaster aadc1a17595f) against the backfilled RPC (ledgers [64497618, 64618577], handoff wait 1426s).

Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents 75 11225 4 (0.0%) 0.7 5.3 31.8 3287.0
getFeeStats 250 37493 0 (0.0%) 0.4 0.5 0.5 0.8
getHealth 250 37493 0 (0.0%) 0.4 0.5 0.5 1.0
getLatestLedger 15 2245 0 (0.0%) 2.0 5.8 8.0 22.6
getLedgers (limit=5) 3 442 0 (0.0%) 182.9 1231.9 1666.0 1813.5
getNetwork 100 14978 0 (0.0%) 0.4 0.5 0.6 3.0
getTransaction 75 11224 0 (0.0%) 5.1 11.0 18.4 25.1
getTransactions (limit=200) 10 1475 0 (0.0%) 30.5 349.7 431.4 548.4
getVersionInfo 100 14240 0 (0.0%) 0.4 0.5 0.6 2.3
getEvents results extended
Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents/catch-up 3 453 0 (0.0%) 4.0 17.3 29.5 57.2
getEvents/deep-pager 17.25 2546 0 (0.0%) 0.6 21.8 86.5 1285.1
getEvents/deep-scan 2.25 345 2 (0.6%) 0.6 2.7 9.0 10002.4
getEvents/firehose 1.5 160 0 (0.0%) 0.6 2.3 2.5 3.9
getEvents/head-poll 36 5448 0 (0.0%) 0.7 4.0 6.8 42.3
getEvents/tail-poll 9 1385 2 (0.1%) 0.6 0.8 610.3 10002.4
getEvents/transfer-watcher 6 888 0 (0.0%) 3.7 5.8 6.6 7.9
Performance Evaluation Test #9

🧪 Performance Evaluation Test #9

Commit: e02b5a6f047f (cache-getLatestLedger)
Run: https://github.com/stellar/stellar-rpc/actions/runs/36019452827

✅ Backfill ingestion — verdict: ok

⏳ Backfill ingestion — e02b5a6f047f

Metric Value
Ledgers ingested 120960 ([64476288 -> 64597247])
Retention window 120960
Wall-clock (total) 2h48m13s
Ingest phase 2h19m0s
Bulk-load finalize phase 29m13s
Ledgers/sec (ingest) 14.5

✅ Endpoint load test — verdict: ok

🎯 Endpoint load test — e02b5a6f047f

Serial blast per endpoint (ramp-up 1m, duration 3m, error kill switch 75%, blaster aadc1a17595f) against the backfilled RPC (ledgers [64477042, 64598001], handoff wait 1411s).

Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents 75 11224 9 (0.1%) 0.7 17.2 40.4 7004.2
getFeeStats 250 37493 0 (0.0%) 0.5 0.5 0.6 1.0
getHealth 250 37493 0 (0.0%) 0.4 0.5 0.6 1.1
getLatestLedger 15 2244 0 (0.0%) 6.2 9.9 21.3 33.2
getLedgers (limit=5) 3 442 0 (0.0%) 182.4 1151.0 1463.3 1772.5
getNetwork 100 14978 0 (0.0%) 0.4 0.5 0.6 2.3
getTransaction 75 11225 0 (0.0%) 5.2 11.6 19.1 26.0
getTransactions (limit=200) 10 1475 0 (0.0%) 26.6 316.4 368.9 492.8
getVersionInfo 100 14918 0 (0.0%) 0.4 0.5 0.6 2.7
getEvents results extended
Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents/catch-up 3 440 0 (0.0%) 4.7 27.6 67.3 86.5
getEvents/deep-pager 17.25 2565 1 (0.0%) 0.7 28.2 151.8 2848.8
getEvents/deep-scan 2.25 348 4 (1.1%) 0.6 7.3 10002.4 10002.4
getEvents/firehose 1.5 202 0 (0.0%) 0.7 2.5 3.6 3.7
getEvents/head-poll 36 5403 0 (0.0%) 0.7 8.1 12.2 75.5
getEvents/tail-poll 9 1354 4 (0.3%) 0.7 0.9 7.7 10002.4
getEvents/transfer-watcher 6 912 0 (0.0%) 13.8 23.5 29.2 31.3
Performance Evaluation Test #8

🧪 Performance Evaluation Test #8

Commit: a94ef01c6640 (cache-getLatestLedger)
Run: https://github.com/stellar/stellar-rpc/actions/runs/35904387638

✅ Backfill ingestion — verdict: ok

⏳ Backfill ingestion — a94ef01c6640

Metric Value
Ledgers ingested 120960 ([64461376 -> 64582335])
Retention window 120960
Wall-clock (total) 2h52m59s
Ingest phase 2h23m2s
Bulk-load finalize phase 29m56s
Ledgers/sec (ingest) 14.1

✅ Endpoint load test — verdict: ok

🎯 Endpoint load test — a94ef01c6640

Serial blast per endpoint (ramp-up 1m, duration 3m, error kill switch 75%, blaster aadc1a17595f) against the backfilled RPC (ledgers [64462209, 64583168], handoff wait 1666s).

Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents 75 11225 4 (0.0%) 0.7 14.3 39.4 4698.1
getFeeStats 250 37493 0 (0.0%) 0.4 0.4 0.5 0.8
getHealth 250 37492 0 (0.0%) 0.3 0.4 0.5 1.1
getLatestLedger 15 2244 0 (0.0%) 6.6 9.3 23.5 33.9
getLedgers (limit=5) 3 441 0 (0.0%) 193.2 1043.5 1596.4 1878.0
getNetwork 100 14978 0 (0.0%) 0.4 0.5 0.6 3.0
getTransaction 75 11224 0 (0.0%) 5.9 11.5 18.7 26.4
getTransactions (limit=200) 10 1475 0 (0.0%) 39.8 333.1 449.8 644.1
getVersionInfo 100 14393 0 (0.0%) 0.4 0.5 0.6 3.1
getEvents results extended
Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents/catch-up 3 448 0 (0.0%) 5.7 34.8 53.9 183.7
getEvents/deep-pager 17.25 2544 0 (0.0%) 0.6 23.8 110.1 2807.8
getEvents/deep-scan 2.25 348 1 (0.3%) 0.6 7.8 16.3 10002.4
getEvents/firehose 1.5 219 0 (0.0%) 0.6 2.4 3.5 5.0
getEvents/head-poll 36 5367 0 (0.0%) 0.7 6.8 10.6 72.8
getEvents/tail-poll 9 1393 3 (0.2%) 0.6 0.9 1252.4 10002.4
getEvents/transfer-watcher 6 906 0 (0.0%) 10.7 19.0 23.3 26.8
Performance Evaluation Test #7

🧪 Performance Evaluation Test #7

Commit: 678da212121a (cache-getLatestLedger)
Run: https://github.com/stellar/stellar-rpc/actions/runs/35751980127

✅ Backfill ingestion — verdict: ok

⏳ Backfill ingestion — 678da212121a

Metric Value
Ledgers ingested 120960 ([64442304 -> 64563263])
Retention window 120960
Wall-clock (total) 2h58m2s
Ingest phase 2h26m24s
Bulk-load finalize phase 31m38s
Ledgers/sec (ingest) 13.8

✅ Endpoint load test — verdict: ok

🎯 Endpoint load test — 678da212121a

Serial blast per endpoint (ramp-up 1m, duration 3m, error kill switch 75%, blaster aadc1a17595f) against the backfilled RPC (ledgers [64443076, 64564035], handoff wait 1427s).

Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents 75 11225 11 (0.1%) 1.0 15.1 74.0 9453.6
getFeeStats 250 37492 0 (0.0%) 0.7 0.8 67.5 133.0
getHealth 250 37492 0 (0.0%) 0.7 0.8 80.2 146.3
getLatestLedger 15 2244 0 (0.0%) 4.8 9.0 83.2 146.3
getLedgers (limit=5) 3 443 0 (0.0%) 180.1 1335.3 1815.6 1931.3
getNetwork 100 14978 0 (0.0%) 0.7 0.9 71.0 138.4
getTransaction 75 11225 0 (0.0%) 5.4 13.4 38.6 110.7
getTransactions (limit=200) 10 1475 0 (0.0%) 33.5 342.0 400.6 489.7
getVersionInfo 100 14031 0 (0.0%) 0.7 0.9 56.2 125.4
getEvents results extended
Endpoint Target RPS Requests Errors p50 (ms) p95 (ms) p99 (ms) p99.9 (ms)
getEvents/catch-up 3 465 0 (0.0%) 4.9 33.2 72.6 185.1
getEvents/deep-pager 17.25 2626 2 (0.1%) 0.9 30.4 186.2 1934.3
getEvents/deep-scan 2.25 317 2 (0.6%) 0.9 6.4 25.8 10010.6
getEvents/firehose 1.5 211 0 (0.0%) 0.9 2.8 3.6 11.5
getEvents/head-poll 36 5381 0 (0.0%) 1.0 6.2 45.0 139.1
getEvents/tail-poll 9 1340 7 (0.5%) 0.9 1.2 732.2 10002.4
getEvents/transfer-watcher 6 885 0 (0.0%) 10.5 18.7 22.5 72.2
Performance Evaluation Test #6

🧪 Performance Evaluation Test #6

Commit: d00c2414130d (cache-getLatestLedger)
Run: https://github.com/stellar/stellar-rpc/actions/runs/35665188044

✅ Backfill ingestion — verdict: ok

⏳ Backfill ingestion — d00c2414130d

Metric Value
Ledgers ingested 120960 ([64429952 -> 64550911])
Retention window 120960
Wall-clock (total) 3h3m44s
Ingest phase 2h31m21s
Bulk-load finalize phase 32m23s
Ledgers/sec (ingest) 13.3

❌ Endpoint load test — verdict: fail

❌ Endpoint load test failed (run 35665188044-1 on d00c2414130dcbafb094798a58518ce3f266d22c)

target RPC http://172.31.14.196:8000: http://172.31.14.196:8000 never reported healthy (last: [-32603] Post "http://172.31.14.196:8000": dial tcp 172.31.14.196:8000: connect: no route to host): context deadline exceeded

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cjonas9 force-pushed the cache-getLatestLedger branch from 964464c to 4096f19 Compare September 11, 2026 17:40
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cjonas9 added this pull request to stack #963 September 11, 2026 17:46
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}

func (c *latestLedgerCache) handle(ctx context.Context, _ protocol.GetLatestLedgerRequest) (json.RawMessage, error) {
latestSequence, err := c.ledgerReader.GetLatestLedgerSequence(ctx)

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Instead of adding an additional complex caching layer which in turn is relying on an existing caching layer (GetLatestLedgerSequence uses the ledger range cache), we should consider extending the latter layer, instead. Namely, we could do something like extend store.LedgerRange's LedgerInfo:

// LedgerInfo identifies one ledger: its sequence number and close time.
type LedgerInfo struct {
	Sequence  uint32
	CloseTime int64
+	Response json.Message // can be nil
}

where Response gets filled by getLedgerRangeWithCache where you can selectively decide whether substr(meta, 1, %d) AS meta_prefix is included in the DB query or if the entire meta gets returned. That way the default stays as-is, where you get faster lookups if you don't care about the entire cached meta value, but in the opt-in case, we cache the meta into LedgerInfo and propagate Response directly to the JSON marshaller.

Pros: one cache mechanism as a source of truth, DRY.
Cons: violation of abstraction barriers since the DB caching layer now speaks method JSON; the optimization propagates through the entire stack

The con can be alleviated somewhat by caching only the meta rather than the entire GetLatestLedgerResponse and computing the other fields on the fly, but then it's not as good of an optimization. But in either case, we remove the entire hairy secondary caching layer.

What do you think?

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Hmm, it's a good question, and I'm not certain I have an off-the-cuff answer.

My first instinct got a bit ahead of myself -- I was hoping that the jrpc2 Bridge bypass would have covered enough slack to justify throwing out the caching optimization. Ran a quick, non-benchmark A/B test locally and discovered that is sadly not the case:

getLatestLedger (through dispatcher) Per request Allocated
Uncached, render per request 3.8 ms 15.6 MB
Cached RawMessage memo (what is committed) 0.34 ms 13 KB

Thus it doesn't seem I can dodge your question here. Also, I checked only quickly, but that speedup above is dominated by skipping the rendering -- saving only the raw fields doesn't help us much.

I like the idea of DRYing this, though I do see the con about this violating our abstraction layers. And more than that, this adds a struct that's only used by getLatestLedger rides along on a struct that shows up in getHealth, getLedgers, getTransactions, and getEvents.

I had a hard time finding a middle ground here. To me, the alteration my Claude came up with seems like perhaps a marginal improvement, but largely in the spirit of the original optimization:

Pull it out as a ~20-line generic in methods, ledgerMemo[T], keyed by sequence: load, compare, render on miss, store with a compare-and-swap that keeps the higher sequence. That covers the older-read-view case in one line. The only remaining design choice is the miss mutex: keep it if you want one render per ledger boundary under load, drop it if 3.8 ms times a few concurrent misses every five seconds is acceptable. Either way it is a self-contained, backend-agnostic piece with a two-line contract, and the store's range cache stays what it is today, a cache of scalars with its own trim and reset rules that the memo never touches.

I think I've always found memoization to be particularly tricky, and it may just be a bit late in the evening for me to try to reason about improvements to a memoization design. That is to say, I don't have strong feelings about which potential design is best here. Either way, happy to hear your thoughts!

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No dependency changes detected. Learn more about Socket for GitHub.

👍 No dependency changes detected in pull request

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cjonas9 force-pushed the cache-getLatestLedger branch from 1f06ef3 to 7168be4 Compare September 17, 2026 22:10
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cjonas9 removed this pull request from stack #963 September 18, 2026 20:16
@cjonas9 cjonas9 changed the title [DRAFT] optimize getLatestLedger: cache and bypass jrpc2 marshal + unmarshal [DRAFT] Optimize query-path caching and bypass jrpc2 marshal + unmarshal Sep 21, 2026
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cjonas9 force-pushed the cache-getLatestLedger branch from a94ef01 to e02b5a6 Compare September 24, 2026 15:20
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cjonas9 changed the base branch from scanledgers-iterator to bypass-jrpc2-marshal September 24, 2026 15:24
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cjonas9 added this pull request to stack #1038 September 24, 2026 15:24
@cjonas9 cjonas9 changed the title [DRAFT] Optimize query-path caching and bypass jrpc2 marshal + unmarshal [DRAFT] Optimize query-path caching/memoization Sep 24, 2026
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@cjonas9 cjonas9 added this to the platform sprint 76 milestone Sep 29, 2026
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@cjonas9 cjonas9 closed this Oct 2, 2026
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