Maintenance: job download status test coverage

[crowecawcaw]

Description

New job tracking feature could use additiona test coverage. Some ideas:

Cancellation

• Ctrl+C mid-task-download → AssetSyncCancelledError propagates, checkpoint not advanced
• Ctrl+C between tasks of a multi-task job → succeeded tasks' files remain on disk
• Cancel with N jobs in flight → remaining futures cancelled, no partial job_download_results recorded as success
• Cancel → status file not written (assert current behavior) or write partial status (if you change it)
• sigint_handler.continue_operation false but _download_manifest_paths returns normally → still raises

Task ↔ job status consistency

• Preserve branch: job failed→downloaded, existing failed task entry → task cleared to downloaded
• Inactive flip with downloaded_files > 0 → job error_code/error_message/failed_files cleared
• Inactive flip with downloaded_files == 0 → job skipped, tasks cleared
• Invariant test: no entry where download_status == "downloaded" and any task has non-null error_code
• Requeued job genuinely re-running → tasks not falsely reconciled to downloaded

Zero-output tasks

• End-to-end: succeeded task whose session action has empty manifests → appears in tasks as downloaded, total_files: 0
• Job with mixed output/no-output steps → numerator matches taskRunStatusCounts.SUCCEEDED
• Verify _filter_session_actions_without_manifests_from_job_sessions doesn't strip the task before attribution
• Cleanup pass at _incremental_download.py:1551 must not del legitimately-empty task entries

Attribution loop

• Same path in 3+ manifests across 3 jobs, list order shuffled → newest timestamp wins
• Same path across two tasks of the same job (requeue) → owned by exactly one task, downloaded once
• Cross-job transfer then within-job overwrite of the same path (interleaved)
• Loser job with all paths transferred → still reports filesystem-based status, entry not dropped
• None-sentinel invariant: no None survives into any download batch
• Task with mixed task-attributed + non-task-attributed paths → leftovers downloaded, counted once, not double-counted
• Manifest key with no step-/task- segment → task_id is None, path falls to job-level bucket
• Property/fuzz test over (timestamp, job, task, path) tuples asserting: every path downloaded exactly once, counts sum correctly

Error classification

• context chain (implicit raise inside except) — currently UNKNOWN; decide + test
• JobAttachmentsS3ClientError with status codes other than 403/404 → UNKNOWN, not misclassified
• Cyclic cause chain terminates
• Verbose "Not found. Please check your bucket name…" message with no structured signal → UNKNOWN (regression guard on the removed substring matching)

Status file lifecycle

• Two processes writing concurrently (real threads/procs, not mocked) → no lost update, no corrupt JSON
• Lock held past TTL by slow holder → second writer takes over, first doesn't unlink another's lock
• Lock acquisition timeout → proceeds unlocked with warning
• Corrupt/truncated existing status file → merge degrades gracefully, doesn't lose the run
• Multiple storage-profile locations, one unmounted mid-run → other locations still written

Failed-jobs tracker (thin coverage today)

• Retry cap boundary: attempt 5 → warning + suppressed from candidates on run 6
• --force-bootstrap clears abandoned entries
• Retried job deleted from service (ResourceNotFoundException) → removed from tracker
• Retried job present in candidates but produces no result entry → cleared, not retried forever
• Throttling/auth error during retry injection → stays in tracker
• Tracker file unwritable → run still succeeds

Cross-cutting

• Windows/macOS path normcase collision (C:\Out\A.exr vs c:\out\a.exr) → treated as one path
• Cross-OS path mapping + per-task attribution together (submit Windows → sync macOS)
• Full-run integration test asserting the producer writes the exact JSON shape DCM consumes (guards against builder-only tests passing while producers are absent)