fix(worker): reindex repos with missing zoekt shards - #1621
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If INDEX_CACHE_DIR is wiped independently of the DB (e.g. placed on ephemeral storage in Kubernetes), repos stay marked as indexed while their shard files are gone, and search silently returns nothing until the next scheduled reindex. On startup, scan the index directory and re-queue any repo the DB believes is indexed but has no shard file on disk, reusing the existing repo-index workload and its per-repo execution lock.
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. WalkthroughThe backend checks indexed repositories for missing Zoekt shard files during startup. It schedules affected repositories for reindexing and continues processing after individual enqueue failures. Tests cover shard detection, repository eligibility, and error handling. ChangesMissing shard recovery
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change adds localized startup recovery for repositories whose indexed shard files are missing; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Startup
participant Recovery
participant Prisma
participant JobManager
Startup->>Recovery: invoke missing-shard recovery after config sync
Recovery->>Prisma: query eligible indexed repositories
Recovery->>Recovery: compare repositories with valid Zoekt shard files
Recovery->>JobManager: schedule repo-index jobs for missing shards
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 3 files. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@packages/backend/src/repoCleanupWorkload.ts`:
- Around line 245-246: Update the repo cleanup flow around INDEX_CACHE_DIR so a
missing directory is treated as an empty shard set rather than returning early.
Continue to the database query with an empty entry list, allowing eligible
indexed repositories to queue recovery jobs, and update the no-directory
regression test to expect recovery.
- Line 257: Update the shard-entry handling around getRepoIdFromShardFileName to
require the filename’s .zoekt extension before accepting its repository ID;
ignore valid-looking non-shard names such as 1_42_backup, and add a regression
test covering that case.
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CHANGELOG.mdpackages/backend/src/index.tspackages/backend/src/repoCleanupWorkload.test.tspackages/backend/src/repoCleanupWorkload.ts
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1 issue found and verified against the latest diff
Prompt for AI agents (unresolved issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="packages/backend/src/repoCleanupWorkload.ts">
<violation number="1" location="packages/backend/src/repoCleanupWorkload.ts:279">
P2: A multi-shard repo is considered healthy when any single shard file remains, so a partial shard loss (one fanout file deleted while others survive) is never detected and the repo is skipped, leaving incomplete search results until the next scheduled reindex. This is one of the scenarios the PR lists as covered, but the presence-only check can't catch it.</violation>
</file>
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Fix all with cubic | Re-trigger cubic
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| const reposMissingShards = indexedRepos.filter( | ||
| (repo) => !repoIdsWithShards.has(repo.id), |
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P2: A multi-shard repo is considered healthy when any single shard file remains, so a partial shard loss (one fanout file deleted while others survive) is never detected and the repo is skipped, leaving incomplete search results until the next scheduled reindex. This is one of the scenarios the PR lists as covered, but the presence-only check can't catch it.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At packages/backend/src/repoCleanupWorkload.ts, line 279:
<comment>A multi-shard repo is considered healthy when any single shard file remains, so a partial shard loss (one fanout file deleted while others survive) is never detected and the repo is skipped, leaving incomplete search results until the next scheduled reindex. This is one of the scenarios the PR lists as covered, but the presence-only check can't catch it.</comment>
<file context>
@@ -231,3 +232,72 @@ export const cleanupOrphanedRepoResources = async (db: PrismaClient) => {
+ });
+
+ const reposMissingShards = indexedRepos.filter(
+ (repo) => !repoIdsWithShards.has(repo.id),
+ );
+
</file context>
Two gaps in the missing-shard reconciliation added for sourcebot-dev#1210: - A missing INDEX_CACHE_DIR caused an early return, skipping recovery entirely for the exact scenario the check exists to handle (the whole index directory gone). Now treated as zero shards on disk instead. - Shard detection accepted any numeric-prefixed filename, so the .meta sidecar zoekt writes alongside every shard, or an unrelated file, could make a repo look healthy with no searchable index. Now requires the real .zoekt suffix.
Missing-shard recovery ran before configManager.syncConfig(), so it could evaluate repo eligibility against connections about to be removed by this startup's config sync, wasting a reindex enqueue on a repo that's about to be orphaned. Moved it after syncConfig(), which handles connection removal synchronously, and still before reconcileJobSchedulers()/jobManager.start().
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Summary
Fixes #1210
Note: a few earlier community PRs attempted this against the old
repoIndexManager.ts, which has since been replaced by the BullMQ workload system (repoIndexWorkload.ts,repoCleanupWorkload.ts,jobManager.ts). This targets the current architecture and reuses its existing queue/lock conventions.Testing
yarn workspace @sourcebot/backend testyarn workspace @sourcebot/backend buildNote
Medium Risk
Changes worker startup to enqueue indexing for many repos after index loss; mis-detection could cause extra load, but scope is limited to connected/pinned indexed repos and mirrors existing reindex eligibility.
Overview
Adds startup recovery when the database still marks repositories as indexed but Zoekt shard files are gone from
INDEX_CACHE_DIR(for example after ephemeral index storage is wiped).On worker boot, after config sync and before job schedulers start,
reindexReposWithMissingShardsscans the index directory for real*.zoektshards (ignoring.tmp,.meta, and other non-shard files), loads indexed repos that still have a connection orisAutoCleanupDisabled, and enqueuesrepo-indexjobs at scheduled priority for any mismatch. Enqueue failures are logged per repo so one Redis error does not block the rest or crash startup.Regression tests cover missing index dirs, partial shard artifacts, multi-shard repos, and mixed healthy/broken repos.
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Summary by CodeRabbit