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fix(jetstream): keep live ingest running across relay restarts - #111
After the v0.10.0 staging deploy, Jetstream logged hundreds of verification failure chain breaks. The cause is a silent stall in live ingestion:
atmos v0.3.6 treats any failed websocket dial that carries an HTTP response as permanent (*DialError) and ends the event iterator. A Relay restart behind Railway's proxy answers 502/503 for a few seconds.
The live consumer then returned nil, so the steady-state errgroup goroutine exited cleanly. Jetstream kept running without ingesting. On staging this lasted about 11 hours after a 503 at 00:30. It happened again at 11:18 after the v0.10.0 Relay redeploy and is still stalled: the Relay had events 196203–196222 that Jetstream never read.
On restart, the stale cursor replayed the backlog faster than it could be verified. The per-account verify queue (64 entries) overflowed and dropped at least 495 events. Every later commit for those accounts logged a chain break until resync, and Railway's 500 lines/s limit discarded about 5,800 log lines.
Changes
Transient rejections are retried. A dial wrapper (live/upstream_dial.go) returns 408, 425, 429 and 5xx rejections to atmos without the response, so atmos backs off and redials from the same cursor. Each retry logs upstream dial rejected; retrying, and each successful connection logs upstream connected. Both are counted in new metrics.
No silent stop. If the upstream iterator ends while the consumer should still be running, Run returns ErrUpstreamStreamEnded (wrapping the last stream error). The process then exits and Railway restarts it. Normal cancellation and the bootstrap-to-steady cutover are unchanged.
Larger queue, paced reads. Verify parallelism defaults to 128 (per-account queue 256, up from 64). Upstream reads are paced at 500 frames/s. Both are configurable via JETSTREAM_LIVE_VERIFY_PARALLELISM, JETSTREAM_LIVE_UPSTREAM_READ_RATE and JETSTREAM_LIVE_UPSTREAM_READ_BURST, and documented in jetstream/README.md.
Summarised failure logs. The first verification failure per account and class is logged in full. Repeats within a minute are reported in one verification failures repeated line with the count and last error. jetstream_verifier_failures_total still counts every failure, and tracked state is capped at 10,000 accounts.
Operator notes
Pacing caps catch-up speed. At 500 frames/s, one million backlog events take about 35 minutes. Raise the rate if the Relay's sustained event rate gets close to it.
The upstream dial now sends User-Agent: hypercerts-jetstream/<version> instead of atmos's default. atmos doesn't export its dial function or UA string, so the wrapper needs its own dial.
Staging Jetstream is currently stalled and needs a restart, or this deploy, to resume ingestion.
Verification
go build ./..., go vet ./..., gofmt -l (clean) and git diff --check in jetstream/.
New tests: dial classification, retry from the persisted cursor across two 503s, terminal-stream error, read pacing, config validation, and the log summariser. The retry test fails without the fix, reproducing the stall.
The changed packages also pass on the CI toolchain (GOTOOLCHAIN=go1.27.3).
Full go test ./...: passes apart from two intermittent failures in packages this change doesn't affect.
internal/oracle sometimes crashes with send on synctest channel from outside bubble, a failure class documented in internal/oracle/doc.go. It also fails on unmodified main: 4 of 30 runs there, 2 of about 31 on this branch.
internal/subscribeTestWalkFromCursor_ReadLogFloorConcurrentRotation failed once under full-suite load, then passed 20 isolated reruns.
Two independent review rounds against the TECH-883 acceptance criteria. Round 1 found one blocking issue (changeset level should be minor), now fixed. Round 2 passed with no blocking findings. Both rounds used the Claude reviewer agent because the planned gpt-6.1-sol reviewer had hit its usage limit.
Not yet verified against a real Relay restart; please check on staging after deploy.
Live ingestion retries transient upstream rejections with backoff and resumes from the same cursor. Other unexpected stream endings now report a clear error.
Successful connections and retry activity are logged and counted.
Performance and Configuration
Verification parallelism defaults to 128 workers, and upstream reads are paced at 500 frames per second. These settings, including read burst size, can be adjusted.
Logging
Repeated verification failures are summarized by account and failure type instead of generating a warning for every occurrence.
Documentation
Added guidance on live ingestion retries, pacing, configuration, and monitoring.
A single HTTP 502/503 from the relay during reconnect made atmos end the
upstream iterator, and the live consumer returned nil, leaving Jetstream
running without ingestion for hours. On restart the stale cursor replayed a
large backlog that overflowed the per-DID verify queue (TECH-883).
- Retry transient dial rejections (408, 425, 429, 5xx) with backoff and log
each successful upstream connection.
- Return ErrUpstreamStreamEnded when the iterator ends while the consumer is
still running, so the process exits instead of stalling silently.
- Raise verify parallelism to 128 (per-DID queue 256) and pace upstream reads
at 500 frames/s by default; both are configurable.
- Summarise repeated verification failure log lines per DID and class.
This work was assisted by a machine
- Mark the changeset minor: it adds three configuration options.
- Assert that redials after transient rejections resume from the persisted
cursor.
- Add hypercerts markers to the remaining upstream-file hunks and drop a
pass-through classifier wrapper.
This work was assisted by a machine
Live ingestion gains settings for verification parallelism, upstream read rate, and read burst. Validation and defaults are added, and the settings flow from serve flags through runtime and orchestrator configuration to both live consumers. Tests cover configuration behavior. The README describes the settings and catch-up estimate.
The dial wrapper treats HTTP 408, 425, 429, and 5xx responses as retryable, closes rejected response bodies, and records successful connections and transient rejections. It can pace connection reads. If the iterator ends while the context remains active, Run returns ErrUpstreamStreamEnded, wrapping the last stream error when available. Tests cover retries from the persisted cursor, permanent rejection handling, metrics, and stream termination.
The runtime sends verification failures to a logger that records the first failure for each DID and failure class, counts repeats, and emits summaries. It limits tracked keys and flushes pending summaries on shutdown. Tests cover repeats, overflow, and shutdown flushing. The metric continues to count every failure.
sequenceDiagram
participant ConsumerRun
participant StreamingIterator
participant upstreamDial
participant Upstream
ConsumerRun->>StreamingIterator: Start live event iteration
StreamingIterator->>upstreamDial: Dial with persisted cursor
upstreamDial->>Upstream: Open WebSocket connection
Upstream-->>upstreamDial: Return transient HTTP rejection
upstreamDial-->>StreamingIterator: Return retryable error without response
StreamingIterator->>upstreamDial: Retry with the same cursor
upstreamDial->>Upstream: Open WebSocket connection
Upstream-->>upstreamDial: Return successful connection
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Possibly related PRs
hypercerts-org/hypercerts-relay#104: Adds dropped-event callbacks and repository recovery for verify-queue losses, which relate to this PR’s queue settings and drop behavior.
Operators who set live verification parallelism to 1 could see memory grow without bound during catch-up, contrary to what the documentation says. Reject or bound that setting and correct the README before merging. The default configuration is not affected.
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The title names the fix area (jetstream) and the goal (keeping live ingest running across relay restarts). The changeset adds retries for transient HTTP dial rejections (408, 425, 429, 5xx) that resum…
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The title names the fix area (jetstream) and the goal (keeping live ingest running across relay restarts). The changeset adds retries for transient HTTP dial rejections (408, 425, 429, 5xx) that resume from the same cursor, returns ErrUpstreamStreamEnded on unexpected stream ends, and adds tuning options and failure-log summarization. The title matches the main fix, which is retrying transient relay rejections. It does not mention the tuning options or log summarization, which is acceptable for a title.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @jetstream/internal/ingest/live/consumer.go:
- Line 512: Reject VerifyParallelism equal to 1 in the configuration validation
used by the live consumer, while preserving support for other valid values; also
update the README entry for --live-verify-parallelism so it no longer describes
this setting as providing full backpressure.
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Fixes TECH-883.
What happened
After the v0.10.0 staging deploy, Jetstream logged hundreds of
verification failurechain breaks. The cause is a silent stall in live ingestion:*DialError) and ends the event iterator. A Relay restart behind Railway's proxy answers 502/503 for a few seconds.nil, so the steady-state errgroup goroutine exited cleanly. Jetstream kept running without ingesting. On staging this lasted about 11 hours after a 503 at 00:30. It happened again at 11:18 after the v0.10.0 Relay redeploy and is still stalled: the Relay had events 196203–196222 that Jetstream never read.Changes
live/upstream_dial.go) returns 408, 425, 429 and 5xx rejections to atmos without the response, so atmos backs off and redials from the same cursor. Each retry logsupstream dial rejected; retrying, and each successful connection logsupstream connected. Both are counted in new metrics.RunreturnsErrUpstreamStreamEnded(wrapping the last stream error). The process then exits and Railway restarts it. Normal cancellation and the bootstrap-to-steady cutover are unchanged.JETSTREAM_LIVE_VERIFY_PARALLELISM,JETSTREAM_LIVE_UPSTREAM_READ_RATEandJETSTREAM_LIVE_UPSTREAM_READ_BURST, and documented injetstream/README.md.verification failures repeatedline with the count and last error.jetstream_verifier_failures_totalstill counts every failure, and tracked state is capped at 10,000 accounts.Operator notes
User-Agent: hypercerts-jetstream/<version>instead of atmos's default. atmos doesn't export its dial function or UA string, so the wrapper needs its own dial.Verification
go build ./...,go vet ./...,gofmt -l(clean) andgit diff --checkinjetstream/.GOTOOLCHAIN=go1.27.3).go test ./...: passes apart from two intermittent failures in packages this change doesn't affect.internal/oraclesometimes crashes withsend on synctest channel from outside bubble, a failure class documented ininternal/oracle/doc.go. It also fails on unmodifiedmain: 4 of 30 runs there, 2 of about 31 on this branch.internal/subscribeTestWalkFromCursor_ReadLogFloorConcurrentRotationfailed once under full-suite load, then passed 20 isolated reruns.minor), now fixed. Round 2 passed with no blocking findings. Both rounds used the Claude reviewer agent because the plannedgpt-6.1-solreviewer had hit its usage limit.🤖 Generated with Claude Code
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