Support envio start --chain to run chains in separate processes - #1637
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Support envio start --chain to run chains in separate processes#1637DZakh wants to merge 15 commits into
envio start --chain to run chains in separate processes#1637DZakh wants to merge 15 commits into
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Isolated (per-chain) projects can now split one schema across processes:
`envio local db-migrate up` creates it for every chain, then each
`envio start --chain <id>` drives one of them.
The flag is refused unless every entity is per-chain, since processes that
each advance their own checkpoint sequence can't share rows, and unless the
schema already exists, since initializing under the flag would leave the
chains this process skipped with no state to resume.
Schema indexes are global objects on shared tables, so no process builds them
while another chain is still backfilling. `ready_at` split into two columns to
make that expressible:
- `backfill_completed_at` — this chain reached its head or end block. Each
process stamps its own chains, then reads the table. Stamping before the
read is what makes the barrier safe: two processes finishing together
can't both see the other pending, so at least one finds the table fully
stamped and builds.
- `ready_at` — the schema's indexes are committed. Written for every chain at
once, only after they all verify, so it keeps meaning exactly what it did.
Index DDL now runs one transaction per index under a schema-scoped advisory
lock. `CREATE INDEX` carries no `IF NOT EXISTS`, so without it sibling
processes would each build the whole set and every loser would fail on a name
the winner took, killing an indexer. The lock also collapsed the three
near-duplicate build sites into one, and made `ensureSchemaIndexes` redundant:
the resume path now goes through `finalizeBackfill`, which is what lets a
finalize that died between the stamp and the build commit `ready_at` on retry.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
Chain-metadata writes cleared the caught-up stamp. `backfill_completed_at` commits before the index build, but the in-memory timestamp it mirrors is only set after it, so a metadata write landing in that window wrote NULL back over the stamp. A sibling's count then never reached zero, holding the barrier shut for good and disabling the recovery pass with it. The column is no longer a `metaFields` member: `markChainsCaughtUp` is its only writer and is sticky, so no other path can clear it. A progressing batch could skip the finalize phase. `applyBatchProgress` inferred realtime from per-chain readiness, which a resume seeds from `backfill_completed_at`. A run that resumed still owing indexes flipped to realtime on its first batch and never built them. The inference is gone; realtime now comes only from the resumed `ready_at` or from `markReady`. It was redundant either way. `repairSchemaIndexes` could kill the indexer. Nothing awaits it, so a rejection from the chain count escaped to the process-wide unhandled-rejection handler and exited. The whole body is guarded now, matching its best-effort contract. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
`buildIndex` reserves a connection when it opens its transaction, so waiting for the schema's advisory lock inside Postgres held that connection for as long as a sibling `--chain` process took to build. With `ENVIO_PG_MAX_CONNECTIONS` at its default of 2, and `ensureQueryIndexes` fanning out over columns, that could consume the pool and stall the writes this indexer was trying to make. It now tries the lock instead of waiting: failing to take it ends the transaction, hands the connection back, and the caller comes round again after a short delay. Whatever the holder builds, the next attempt's catalog re-read sees, so the loop terminates either way. Also corrects `finalizeBackfill`'s log lines, which still claimed writes were paused and the indexer had yet to report ready. The resume path reaches it on a live, already-ready indexer, which is exactly when those messages are read. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
`isChainSubset` was computed by comparing chain counts, so `--chain 1 --chain 137` on a two-chain config read as an unfiltered run: it skipped the resume narrowing and allowed initializing a fresh database, which is exactly what the flag must not permit. Replaced by asking whether the flag was given at all. Narrowing the resumed state to the chains the run drives is now unconditional. It holds in every mode, is a no-op with the full set, and a config that genuinely disagrees with the database is already rejected by the stored-config check before it gets here — so the flag was gating an invariant, not a mode. `runOnce` and the resume-repair path shared the barrier's count-then-build sequence verbatim; it lives in one place now, so the rule that reads the count only after committing its own stamps can't drift between them. `buildIndex` returned nested options whose three cases had to be decoded by position; they are a named variant. Its retry now backs off, since each attempt reserves a pooled connection and the holder's build can run for minutes. Both refusal messages stop listing every entity when the whole schema is cross-chain, which is the common case and was printing the schema back at the user; the CLI check also moved ahead of codegen so a mistyped chain fails in the moment. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
Replaces `backfill_completed_at` with the question it was standing in for: has this chain's committed progress reached its end block, or the head it last observed. That is `ChainState.isDurablyCaughtUp` evaluated over persisted rows, the same judgement a resumed run already trusts to decide whether it owes a finalize. The pair it reads is safe to read from another process because `progress_block` and `source_block` are written as one group by the batch write, so a sibling never sees a half-updated row. A chain sitting at its head keeps its last committed pair and goes on reading as caught up; one still backfilling reads as far behind; one nothing has fetched for has no head to be measured against and reads as behind too. The race argument is unchanged. Each process flushes its writes before it reads the chains, so it reads after its own commit, and two processes finishing together cannot both stand down. This unwinds the column split entirely. `ready_at` is once again the only readiness stamp, still written by `finalizeBackfill` alone and still only after every index verifies. The table definition is now byte-identical to main, so the feature no longer forces a resync. `ready_at` stays out of `metaFields`: that is what stops a chain-metadata write from stamping a chain ready before the indexes exist, which is the one thing the whole design has to prevent. The standing-down log now names the chains it is waiting on rather than counting them. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
…tion Two ways the derived barrier could permanently skip building the schema's indexes, both found reviewing the previous commit. A chain configured with an `end_block` above its head is never reached, and the predicate only tested the end block when one was set. Such a chain read as backfilling for good, so a plain single-process indexer with that config silently never got its indexes. The predicate now asks whether the chain reached its head **or** its end block, matching what the indexer itself counts as caught up. The larger point is that any false negative was fatal, because the pass ran once. A chain that legitimately commits progress behind its head — a burst it has yet to process, a rollback — would read as behind, and the process that saw it would stand down for the rest of the run. The debt is now state: a pass that stands down leaves `owesSchemaIndexes` set, the loop comes back on the next batch, and the first pass that finds every chain caught up settles it. That is also what lets an `envio start --chain` process pick the indexes up when a sibling finishes, instead of waiting for a restart. `isFinalizingIndexes` keeps its old meaning, the first pass not yet done, since that is what "idle" is measured against. Loop re-entry asks the wider `shouldRunFinalize`. The stand-down log drops to debug after the first pass, because it now runs per batch while the debt stands. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
…ghtUp The retry pass read the chains without flushing, so it could read its own row from before the batch that had just been queued. The flush is idempotent and the read has to follow this process's own commit whichever pass it is, so it is no longer gated on the first one. Only the announcing and the switch to realtime are once-only. The retry ran on every batch for as long as a sibling chain was behind, which in a `--chain` deployment is hours. It now waits `finalizeRetryIntervalMillis` between passes, defaulting to thirty seconds and overridable in tests like the other tuning knobs. The first pass is never held back, since the run stays short of realtime until it happens. `ChainState.isDurablyCaughtUp` had the same end-block flaw the barrier just lost: it tested only the end block when one was configured, so a chain with an `end_block` above its head read as behind however long it sat at the head. It now matches `FetchState.isFetchingAtHead` and the barrier, which leaves all three predicates agreeing on what caught up means. Also normalizes the chain id on the raw progress read, rather than trusting what the driver made of a BIGINT column. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
An indexer waiting on a chain that nobody started looked entirely healthy: it
logged "ready", ran realtime, and said so once in a line that had scrolled away
hours earlier, while every query relying on the schema's indexes was seq
scanning. Three signals now cover that:
- `envio_schema_indexes_pending`, a gauge that stays at 1 while the indexes
are owed, so the wait is visible from monitoring rather than only from
debug logs.
- A retry that has waited past `finalizeWaitWarnAfterMillis`, fifteen minutes
by default, logs at warn instead of debug, names the chains it is waiting
on, and says to start their processes.
- A build that finds the index lock held says so once, rather than spinning
silently while a sibling's build runs for minutes.
`--chain` with `--restart` was a bare clap conflict, which said nothing about
the one thing that actually resolves it. It is refused in the validator now,
with the full-config migrate-and-restart sequence spelled out. The flag's help
gained the two operational rules it never stated: one process per chain, and
start every chain or the indexes never land.
`repairSchemaIndexes` folds into `run`, which does exactly its work once
`isFirstPass` is false; it is now just the catch that keeps a background
failure from reaching the process's unhandled-rejection handler. `Config` keeps
the chains' block lags rather than a second copy of every chain record, which
also drops a per-pass dict rebuild.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
Judging its own chains from their rows was wrong in two ways a row can't express. A chain with nothing to index — everything before its start block — never has a batch to write a row, so it sat at the insert defaults and read as backfilling for good; a plain single-process indexer configured that way never got its indexes. And a chain resumed at a head that has since run on is still caught up as of the progress it committed, which is exactly what the persisted pair says and what a live head reading would deny. Both disappear once the barrier stops asking. This process is in the finalize phase precisely because its own chains are caught up, so those are settled before it starts; the only open question is the chains other processes drive. A run driving every chain has nobody to wait for and now skips the query altogether, which also puts single-process behavior back exactly where it was. A pass that finds another chain behind records the debt rather than assuming it, so a run that resumed realtime — starting with no debt — still comes back for the indexes once the sibling finishes, instead of standing down for good. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
`ensureQueryIndexes` is awaited on the getWhere path, so waiting indefinitely for the schema's index lock meant a sibling process's multi-minute build could stall this process's handlers — the opposite of what that path promises, which is that the query runs unindexed rather than blocks. It gives up after five seconds and leaves the index to whoever holds the lock. The finalize path still waits, since nothing is awaiting it. Also names the second cause in the long-wait warning. A chain whose start block is above the current head has nothing to commit, so a process driving other chains has no row to judge it by and waits on it for good. The operator can see which chain and move it into a process that indexes it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
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📝 WalkthroughWalkthroughThe change adds repeatable ChangesChain-filtered indexing and deferred finalization
Estimated code review effort: 5 (Critical) | ~120 minutes Sequence Diagram(s)sequenceDiagram
participant CLI
participant Config
participant Persistence
participant FinalizeBackfill
participant PgStorage
CLI->>Config: select active chains
Config->>Persistence: initialize filtered resumed state
Persistence-->>Config: committed chain progress
FinalizeBackfill->>PgStorage: read chain progress
PgStorage-->>FinalizeBackfill: progress and end blocks
FinalizeBackfill->>PgStorage: build and verify schema indexes
PgStorage-->>FinalizeBackfill: verified indexes
FinalizeBackfill->>PgStorage: write readiness timestamps
Merge Risk: 🟡 Moderate · up to A resumed low-height chain can be treated as caught up before its first block is processed, potentially triggering schema finalization too early. This boundary should be fixed before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
Comment |
`validate_chain_selection` gained a third parameter and I never ran the formatter over it, so CI's `cargo fmt --check` caught what my `cargo test` run did not. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
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Inline comments:
In `@packages/cli/CommandLineHelp.md`:
- Line 381: Update the --chain help text in packages/cli/CommandLineHelp.md at
lines 381-381 to state that each configured chain is assigned to exactly one
process, and apply the same wording in
packages/cli/src/cli_args/clap_definitions.rs at lines 147-151 so generated CLI
help matches the documentation.
In `@packages/envio/src/ChainState.res`:
- Line 657: Update isDurablyCaughtUp to compare resumed progress against max(0,
fetchState.knownHeight - cs.chainConfig.blockLag), rather than cs->fetchCeiling,
so block 0 is processed before isCaughtUp becomes true; add a regression test
covering resumed progress -1, knownHeight 5, and blockLag 10.
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packages/cli/CommandLineHelp.mdpackages/cli/src/cli_args/clap_definitions.rspackages/cli/src/executor/dev.rspackages/cli/src/executor/mod.rspackages/envio-tests/test/ChainFilterFinalize_test.respackages/envio-tests/test/ChainFilter_test.respackages/envio-tests/test/ChainMeta_test.respackages/envio-tests/test/ResumeFinalize_test.respackages/envio-tests/test/SchemaIndexes_test.respackages/envio-tests/test/helpers/IndexerRunner.respackages/envio-tests/test/helpers/MockStorage.respackages/envio-tests/test/helpers/Scenario.respackages/envio-tests/test/lib_tests/FinalizeBackfill_test.respackages/envio-tests/test/lib_tests/Metrics_test.respackages/envio-tests/test/lib_tests/PgIndexes_test.respackages/envio-tests/test/lib_tests/PgStorage_test.respackages/envio/src/BatchProcessing.respackages/envio/src/Bin.respackages/envio/src/ChainState.respackages/envio/src/Config.respackages/envio/src/CrossChainState.respackages/envio/src/CrossChainState.resipackages/envio/src/EventProcessing.respackages/envio/src/FinalizeBackfill.respackages/envio/src/IndexerState.respackages/envio/src/IndexerState.resipackages/envio/src/Main.respackages/envio/src/Metrics.respackages/envio/src/Persistence.respackages/envio/src/PgStorage.respackages/envio/src/TestIndexer.respackages/envio/src/db/InternalTable.res
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A chain younger than its own configured block lag gets a negative threshold: with a head of 5 and a lag of 10, the -1 that a run which has processed nothing carries clears `progress >= head - lag`. It would count as durably caught up before block 0 was ever processed, entering the finalize phase and reporting ready on an empty chain. Clamped at zero in both places that ask: `ChainState.isDurablyCaughtUp`, where the comparison predates this branch, and the barrier's own reading of a sibling's row, which inherited it. Not `fetchCeiling`, whose lag also folds in maxReorgDepth and would read a chain a whole reorg depth behind the head as caught up. Reported by CodeRabbit on the pull request. The regression test covers the resumed boundary it named, and fails without the clamp. Also takes its wording fix for the `--chain` help: a process may drive several chains, so what matters is that each chain is assigned to exactly one process, not that each process holds exactly one chain. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
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Summary
Adds support for the
--chainflag toenvio start, allowing multiple processes to index different chains of the same schema in parallel. This requires coordination: schema-wide indexes are deferred until all chains finish backfilling, and a process stands down from building them if a sibling chain is still behind.Key Changes
CLI and Config
--chain <CHAIN_ID>flag toenvio startto select which chains this process indexes--chainnames configured chains and rejects--restart(which would wipe chains other processes drive)blockLagByChainIdfor all chains, even those this process doesn't drive, so the finalize barrier can judge whether any chain is still backfillingIndex Building Serialization
pg_try_advisory_xact_lock(non-blocking) to avoid pinning connections; contended processes back off and retryensureSchemaIndexes(best-effort, live indexing) tofinalizeBackfill(once all chains caught up)Finalize Barrier
finalizeBackfillnow checks whether any chain in the schema is still backfilling before building indexesready_atfinalizeRetryIntervalMillis, default 30s) to avoid polling hard; escalates to warn after 15 minutesState Tracking
CrossChainStatenow tracksowesSchemaIndexesandschemaIndexDebtSinceMillisseparately fromisRealtime, since a process can be realtime but still owe indexes (standing down while a sibling is behind)IndexerStatetrackslastFinalizeCheckMillisto throttle retry passesTest Coverage
ChainFilter_test.res: validates config filtering and rejects invalid selectionsChainFilterFinalize_test.res: two-chain scenario where one process stands down while the other catches up, then both see indexes builtSchemaIndexes_test.reswith scenarios for unreachable end blocks and chains starting past the headResumeFinalize_test.resto verify resumed runs still check for missing indexesNotable Implementation Details
ready_atis written only byfinalizeBackfilland only once all indexes verify, so it's never set while an index is missingchainIdsparameter fromfinalizeBackfill— the schema's indexes are global, not per-chainhttps://claude.ai/code/session_01FiKS7b1cTTVsT6x8kUjE8C
Summary by CodeRabbit
New Features
--chain <CHAIN_ID>support to run indexing for selected chains.Bug Fixes
Documentation
--chainoption and its usage requirements.