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(Claude) Leave a refresh's derived rows unwritten when another refresh moved a file under it - #402
Two cache refreshes of one project can overlap: only process_projects_hierarchy holds the pass lock, so a single-project convert, watch <dir>, a single-session file or the TUI's export can refresh beside a pass, or beside each other. When they did, one of them could write session rows and a project total derived from an older copy of a file than the one the cache records, and nothing ever recomputed them.
The shape
Refresh B parses the files it finds modified and takes the others (beta) from the cache.
Before B commits, beta grows (or a new session starts) and refresh A commits it, with its record and the derived rows.
B commits its derived rows, computed from the old beta. An incremental B's total is a delta over the total it read, which A has since replaced.
beta's record is A's and matches the file, so the next refresh finds nothing to do. With the atomic refresh's one-transaction merge and its per-file merge, full and incremental alike, the project kept a total of 6 against 8 for a fresh cache, and in the full refresh beta's session kept 2 messages against 4. The cold build (a project's first, written per file without a spool) had the same hole: 4 against 6, beta at 2 against 4.
The fix
Both refresh scopes (atomic_refresh, and a new cold_build for the first build) read every cached_files record of the project as they open. That is after the modified-file gate, which only decides whether to refresh, and before any read the derived rows come from. Under the write lock, just before the derived rows, _moved_files compares:
each file the refresh wrote itself with the record it left on it (none to compare in the one-transaction merge, which writes them in the same transaction);
every other file with the record it had in the snapshot; a file present on one side only counts as moved, which covers a session another refresh started.
If any moved, the derived rows (session rows, sidecar, aggregates) are not written and the project's total is left at 0, which the next run already reads as "refresh in full, from what the cache holds". The one-transaction merge still commits the rows it spooled; the per-file merge's existing check is widened from the files it merged to every file; the cold build checks in its aggregates write, its last, and writes 0 instead. A scope with nothing derived checks nothing and marks nothing.
Files a refresh parses come from disk, or from an entry_store hit, which is stamped with the source file's size and mtime, so they are never older than the disk.
The trade
The check cannot tell a commit the refresh's reads missed from one they saw: another refresh committing after the snapshot but before this one reads anything also trips it, though the rows would have been right. That costs the next run one full refresh, never a wrong row, and a test pins it. Read-tracking would have avoided it, but needed hooks in every read path, and an incremental refresh depends on every file anyway, through the total it reads.
Tests
test/test_cache_merge_modes.py, "overlapping refreshes". Refresh A runs on its own thread with its own CacheManager, inside a hook in B; each test asserts that the hook fired, that A raised nothing and (but for the cold build, which has no merge) which merge mode B took, that B left the total at 0, and that after one more refresh the session rows and the total equal a fresh cache's over the same files, with no file reading modified.
A grows a file B took from the cache: one transaction / per file × full / incremental.
A starts a new session: same four arms.
The cold build overtaken on a file it wrote.
The false positive: A commits before B reads (full / incremental). Without the fix, B's total there is already right (10); the test pins that the fix marks it and the next refresh lands at the same place.
On the base, all 11 fail; the false-positive arms fail only at the mark.
Mutations, run over test_cache_merge_modes.py and test_cache_atomic_refresh.py (the per-file overtaken test is the existing one, a writer rewriting a file the per-file merge has merged):
mutation
red
drop the snapshot comparison
all 8 grow / new-session arms, the 2 false-positive arms
ignore a file present only now (a new session)
the 4 new-session arms
drop the check against a refresh's own written records
the per-file overtaken test, the cold arm
drop the check in the one-transaction merge
its 4 grow / new-session arms, the 2 false-positive arms
drop the check in the per-file merge
its 4 grow / new-session arms, the per-file overtaken test
drop the cold build's check
the cold arm
take the snapshot at the merge instead of at scope entry
as dropping the comparison
The atomic_refresh docstring no longer claims that the later of two overlapping refreshes wins with a self-consistent snapshot, which did not hold for a file it took from the cache; it and dev-docs/application_model.md (a new paragraph, "Two refreshes of one project overlapping") say what the scopes check and why the snapshot sits where it does, and CONTRIBUTING's cache paragraph says it in short.
Improved cache consistency when refreshes overlap or a cold build runs alongside another refresh. Projects affected by conflicting updates remain marked for a later refresh instead of showing potentially stale totals.
Documentation
Updated cache guidance to explain how overlapping refreshes and cold builds affect project totals and subsequent refreshes.
Refresh B parses alpha and takes beta from the cache; before B
commits, beta grows and refresh A, on its own thread with its own
manager, commits it with the derived rows. B then writes session rows
and a total from the old beta over A's record, which matches the file,
so no later run recomputes them. The tests assert that A ran inside B,
then that one more refresh leaves what a fresh cache over the files
holds: one transaction and per file, full and incremental, and the
cold build, which writes its files as it parses and has the same hole.
All five fail here: total 6 against 8 (4 against 6 cold), and in the
full and cold arms beta's session at 2 against 4.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A refresh takes the files it does not parse from the cache. Another
refresh of the project (only a hierarchy pass holds the pass lock) can
rewrite one of them and commit before it; the first then wrote session
rows and a total from the rows that one replaced, over a record that
reads current, and nothing recomputed them.
Both refresh scopes now read every file record of the project as they
open, after the modified-file gate and before any read the derived
rows come from. The derived rows are written only if each file the
refresh did not write still carries that record, and each file it did
write the one it left; otherwise the project is left marked unfinished
(total 0) and the next run refreshes it in full. The one-transaction
merge still commits its rows; the per-file merge widens the check it
had; the cold build, which writes per file without a spool, gets a
scope of its own (`cold_build`) and checks in its aggregates write.
A commit after the snapshot that the refresh's reads did see trips the
check too; the test pinning that shows it costs one full refresh.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
B spooled alpha alone, and a refresh of one file merges in one
transaction whatever the threshold, so the per-file arms ran the
one-transaction merge: dropping its check failed them too. B now also
parses a new session, gamma, and the arms assert the mode B merged in.
The false-positive test keeps only the refresh axis: A commits before
B reads, B finds every file current and spools nothing, so its merge
is one transaction in either mode, as its docstring says.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The application model said two overlapping refreshes commit two
self-consistent snapshots, the later winning; that did not hold for a
file the later one took from the cache. It now says what the scopes
check, why the snapshot sits where it does and what a false positive
costs, as the atomic_refresh docstring does since the fix, and the cache
paragraph of CONTRIBUTING says it in short.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A refresh overtaken by another that commits a new session never saw
it: its total leaves the session out, under a record that reads
current. `_moved_files` counts a file with a record now and none as
the refresh began as moved; nothing pinned that term. The overtaken
arms now take the change A makes as a parameter, and a new test has A
start a session, in each mode and refresh. With the term dropped, all
four fail: B leaves a total of 8 and no mark (the reviewer's probe of
the same shape found it still 8 after the next refresh, against 10).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Refreshes now compare project file records before writing derived data. Cold builds track their file writes and leave the project unfinished when records change. Tests cover concurrent refreshes and cold builds.
Changes: Cache Refresh Protection
Layer / File(s)
Summary
Refresh record snapshots and merge guards claude_code_log/cache.py, test/test_cache_merge_modes.py, dev-docs/application_model.md
Refresh scopes snapshot project file records and check for moved records before writing derived rows. Tests cover concurrent updates, added files, and refreshes overtaken before file reads. The documentation describes the snapshot checks and merge behavior.
Cold-build record tracking claude_code_log/cache.py, claude_code_log/converter.py, test/test_cache_merge_modes.py, CONTRIBUTING.md, dev-docs/application_model.md
Cold builds track file identities written while parsing and check for moved records before updating aggregates. The converter enters the cold-build scope. Tests cover an overtaken cold build, and the documentation describes the cold-build behavior.
daaain/claude-code-log#390: Introduced CacheManager.atomic_refresh() and the spool behavior extended by these record checks.
daaain/claude-code-log#400: Added the per-file merge path and cold-cache handling that this change updates.
Suggested reviewers:daaain
Merge Risk: Minimal · up to b4f46
This change makes overlapping cache refreshes avoid writing derived data from stale records. A false positive costs one extra full refresh. No actionable merge-blocking risk remains in the supplied review context.
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Explanation
The title names the main change: a refresh skips writing derived rows when another refresh has moved a file under it. The raw summary and objectives describe snapshot-based record checks before derived writes, with the project total left at 0 when records moved. The title is specific and does not use vague terms. The title uses the "(Claude)" prefix, which does not affect the assessment.
Full details: Docstring Coverage
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CONTRIBUTING.md
claude_code_log/cache.py
claude_code_log/converter.py
dev-docs/application_model.md
test/test_cache_merge_modes.py
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Two cache refreshes of one project can overlap: only
process_projects_hierarchyholds the pass lock, so a single-project convert,watch <dir>, a single-session file or the TUI's export can refresh beside a pass, or beside each other. When they did, one of them could write session rows and a project total derived from an older copy of a file than the one the cache records, and nothing ever recomputed them.The shape
beta) from the cache.betagrows (or a new session starts) and refresh A commits it, with its record and the derived rows.beta. An incremental B's total is a delta over the total it read, which A has since replaced.beta's record is A's and matches the file, so the next refresh finds nothing to do. With the atomic refresh's one-transaction merge and its per-file merge, full and incremental alike, the project kept a total of 6 against 8 for a fresh cache, and in the full refreshbeta's session kept 2 messages against 4. The cold build (a project's first, written per file without a spool) had the same hole: 4 against 6,betaat 2 against 4.The fix
Both refresh scopes (
atomic_refresh, and a newcold_buildfor the first build) read everycached_filesrecord of the project as they open. That is after the modified-file gate, which only decides whether to refresh, and before any read the derived rows come from. Under the write lock, just before the derived rows,_moved_filescompares:If any moved, the derived rows (session rows, sidecar, aggregates) are not written and the project's total is left at 0, which the next run already reads as "refresh in full, from what the cache holds". The one-transaction merge still commits the rows it spooled; the per-file merge's existing check is widened from the files it merged to every file; the cold build checks in its aggregates write, its last, and writes 0 instead. A scope with nothing derived checks nothing and marks nothing.
Files a refresh parses come from disk, or from an
entry_storehit, which is stamped with the source file's size and mtime, so they are never older than the disk.The trade
The check cannot tell a commit the refresh's reads missed from one they saw: another refresh committing after the snapshot but before this one reads anything also trips it, though the rows would have been right. That costs the next run one full refresh, never a wrong row, and a test pins it. Read-tracking would have avoided it, but needed hooks in every read path, and an incremental refresh depends on every file anyway, through the total it reads.
Tests
test/test_cache_merge_modes.py, "overlapping refreshes". Refresh A runs on its own thread with its ownCacheManager, inside a hook in B; each test asserts that the hook fired, that A raised nothing and (but for the cold build, which has no merge) which merge mode B took, that B left the total at 0, and that after one more refresh the session rows and the total equal a fresh cache's over the same files, with no file reading modified.On the base, all 11 fail; the false-positive arms fail only at the mark.
Mutations, run over
test_cache_merge_modes.pyandtest_cache_atomic_refresh.py(the per-file overtaken test is the existing one, a writer rewriting a file the per-file merge has merged):The
atomic_refreshdocstring no longer claims that the later of two overlapping refreshes wins with a self-consistent snapshot, which did not hold for a file it took from the cache; it anddev-docs/application_model.md(a new paragraph, "Two refreshes of one project overlapping") say what the scopes check and why the snapshot sits where it does, and CONTRIBUTING's cache paragraph says it in short.🤖 Generated with Claude Code
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