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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe pull request expands sync state with per-client commit counts and hashes. It updates sync-state generation, missing-commit selection, and JSON handling. It adds tests for state compatibility and recovery from out-of-order commits. It also adds sync-state benchmarks and changes benchmark job configuration. Changes
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to No actionable issue remains from the reviewed changes; the PR is mergeable after normal checks. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Recovery can now retransmit a client's complete commit history, and synchronization state exposes additional aggregate metadata. Existing ingestion protections remain in place, and complete-history retrieval was already possible. No introduced security vulnerability was established, but deployment authorization and isolation remain unverified. Retained concerns Security review detailsSecurity Blast Radius
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In `@src/SIL.Harmony.Core/QueryHelpers.cs`:
- Around line 94-95: Update the timestamp fast path in QueryHelpers so it does
not bypass hash recovery when hash metadata and commit counts indicate the
remote may be missing non-tail commits. Evaluate hash/commit continuity before
selecting only the remote timestamp; retain timestamp-only behavior for legacy
states without hash metadata, or require metadata proving the remote commits are
a local prefix.
In `@src/SIL.Harmony/JsonSyncable.cs`:
- Around line 64-96: Update both GetSyncState and GetChanges to add a
ClientState only when the corresponding client file contains at least one
commit. Track whether ReadAllCommitsAsync yielded any commits, and skip
heads.Add for empty files while preserving existing commit aggregation and state
updates for non-empty files.
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src/SIL.Harmony.Benchmarks/AddSnapshotsBenchmarks.cssrc/SIL.Harmony.Benchmarks/BuildSyncStateBenchmarks.cssrc/SIL.Harmony.Benchmarks/DataModelSyncBenchmarks.cssrc/SIL.Harmony.Benchmarks/Program.cssrc/SIL.Harmony.Core/QueryHelpers.cssrc/SIL.Harmony.Core/SyncState.cssrc/SIL.Harmony.Tests/RepositoryTests.cssrc/SIL.Harmony.Tests/Syncable/SyncRecoveryTests.cssrc/SIL.Harmony.Tests/Syncable/SyncStateTests.cssrc/SIL.Harmony.Tests/Syncable/SyncableTests.cssrc/SIL.Harmony/ISyncable.cssrc/SIL.Harmony/JsonSyncable.cs
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myieye
requested changes
Oct 1, 2026
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This looks pretty good, but I found it a bit hard to read. Specifically how SendCommitsAfterTimestamp and ShouldSendAllCommits sort of overlapped, but were separate.
So, I stacked a pretty significant refactor PR on top of this (that also addresses my feedback below). You could almost just merge yours except for the fact that my refactor changes how commit IDs are being hashed and we don't want 2 different versions of that hashing in develop.
So, see what you think:
#133
myieye
approved these changes
Oct 2, 2026
myieye
removed this pull request from stack #134
October 2, 2026 09:05
* Merge the two send-decision helpers into one plan
SendCommitsAfterTimestamp and ShouldSendAllCommits each only answered half
the question: null from the first meant "ask the second", and the order they
were called in was load-bearing but invisible in either signature. PlanFor
returns the whole decision so the branches are mutually exclusive, and both
overloads share it.
No behaviour change.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
* Fall back to timestamps when a peer sends no commit counts
A peer on a version without ClientStates sends ClientHeads only, which
deserializes to a ClientState with CommitCount and Hash of 0. The hash
never matches and the count is never greater, so once the heads line up
every sync resends that client's entire history, forever.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
* Build the sync state from a single query
GetSyncState read the commits table twice: once grouped for the head
timestamps, once ordered for the hash. Nothing held the two reads to the same
snapshot, and a client id appearing only in the second one fell back to a
builder with a timestamp of 0, which reports a wrong head rather than failing.
SQLite and Postgres would each need different isolation to fix that, so the
timestamp now comes from the same projection as the hash.
That is only possible because the hash no longer depends on order: XORing each
commit id's hash drops the ORDER BY over the whole table, and lets JsonSyncable
stop buffering each client file to sort it. The two changes are one commit
because the state in between doesn't make sense on its own.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
* Rename GetMissingCommits to GetCommitsMissingFromRemote
The name didn't say whose missing commits it returns, and the result is already
called MissingFromClient on ChangesResult. Breaking change for anything outside
this repo calling it directly.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
* Compare whole client states before calling two clients in sync
XOR makes the hash independent of order, but it also means a commit id stored
twice cancels back out of it. A peer holding {c1, c2, c3, c3} hashes the same
as one holding {c1, c2}, so a hash match alone can hide a commit the other side
is missing. The db can't produce a duplicate, but a JsonSyncable client file is
append-only text and two processes on one directory can.
ClientState is a record, so equality already covers id, head, count and hash;
comparing the whole thing says what is meant and picks up the count.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
* Stream commits into the sync state builder
GetSyncState buffered every commit row before hashing. The builder only
ever looks at one row, so feed it the query's async enumerator instead.
At 100k commits on SQLite that is 103 ms and 43 MB per sync instead of
113 ms and 59 MB, and the large array that survived into Gen1/Gen2 is gone.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
* Benchmark GetSyncState end to end
BuildSyncStateBenchmarks only covers the in-memory loop, which is about 1%
of what GetSyncState costs: the query over the whole commits table is the
rest. This runs the real thing against SQLite with 10k and 100k commits.
MemoryDiagnoser is on for both so a per-commit allocation shows up.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
SaveChanges leaves rows tracked, so chunking alone left all 100k commits in the tracker. Also dispose the seeding repository. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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I pushed one more commit to address CodeRabbit's finding on the PR I merged in. |
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If for some reason a client misses a commit, they will now recover and get the commits they lost.
This works by adding more information to Sync State. It now includes the following per client Id
when deciding what commits to return to a remote client the local compares timestamps, if local is greater, then it pushes all commits greater than the remote timestamp (this is how it works today). Otherwise we compare hashes, if they are the same then we don't push any changes. If they are not the same then we compare counts, if local has more or the same number of commits then local pushes everything to the remote (not very efficient, but it works), if local has less commits than remote then it assumes remote has everything it has (this may not be true). This logic is all encoded in
QueryHelpers.SendCommitsAfterTimestampandShouldSendAllCommits.Note there may be a case where they're both missing commits, in that case the one with more will push this sync, and on the next sync the other will push, this is unlikely to happen, and it avoids both clients sharing all commits whenever the hashes don't match.
One downside to this implementation is that if there's a mismatch then all commits for that client ID are synced. This could be a lot of data, if we wanted to change the contract between clients we could add a new API to list all commit Ids for a given clientId, and then another to fetch the missing commit Ids, but I don't think it's worth it for this edge case we're covering.