Trenton H bcc2f11152 Performance: Stream JSON during import for memory improvements (#12276) ...

* Perf: stream manifest parsing with ijson in document_importer

Replace bulk json.load of the full manifest (which materializes the
entire JSON array into memory) with incremental ijson streaming.
Eliminates self.manifest entirely — records are never all in memory
at once.

- Add ijson>=3.2 dependency
- New module-level iter_manifest_records() generator
- load_manifest_files() collects paths only; no parsing at load time
- check_manifest_validity() streams without accumulating records
- decrypt_secret_fields() streams each manifest to a .decrypted.json
  temp file record-by-record; temp files cleaned up after file copy
- _import_files_from_manifest() collects only document records (small
  fraction of manifest) for the tqdm progress bar

Measured on 200 docs + 200 CustomFieldInstances:
- Streaming validation: peak memory 3081 KiB -> 333 KiB (89% reduction)
- Stream-decrypt to file: peak memory 3081 KiB -> 549 KiB (82% reduction)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Perf: slim dict in _import_files_from_manifest, discard fields

When collecting document records for the file-copy step, extract only
the 4 keys the loop actually uses (pk + 3 exported filename keys) and
discard the full fields dict (content, checksum, tags, etc.).

Peak memory for the document-record list: 939 KiB -> 375 KiB (60% reduction).
Wall time unchanged.

2026-03-09 10:20:48 -07:00

9.5 KiB

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