Recover Data from Mapped Fragments

I. Prepare Sources and Extent Manifests

Preserve a stable image and an extent manifest in project format. Ranges record logical file positions and actual source positions. Declare missing ranges explicitly without inferring sources from filenames or document _id.

II. Recover a Single Logical File

DISK_PATH=/recovery-input/mongodb/source/image-source
EXTENT_MAP=/recovery-input/mongodb/source/collection-extents.json
SOURCE_VERSION=8.0.0
SOURCE_KIND=imagecopy
SOURCE_FROZEN=true
RESMODE=all
EXMODE=bson

ds idx;
ds idx status;
ds unload all;

Known logical positions permit reading pages and large-document dependencies across physical fragments. Collection identity and generation still require independent evidence and are not established by mapping completion.

III. Recover Missing Directory Sources

MONGODBDATA=/recovery-input/mongodb/source/dbpath
DIRECTORY_EXTENTS=/recovery-input/mongodb/source/directory-extents.json

b;
ds catalog status;
use appdb;
unload db appdb;

DIRECTORY_EXTENTS supplements collections, HS and metadata bound by matching catalogs. Preserve readable WiredTiger.turtle. Automatic recovery of a missing turtle is not integrated, so scattered collection files alone do not establish complete directory recovery.

IV. Handle Missing Ranges

Missing ranges return EXTENT_SOURCE_PARTIAL. Retain complete parseable documents first and errors for records dependent on missing ranges. Do not zero-fill, guess overflow addresses or assemble missing-page records into complete documents.

V. Continue the Recovery Task

If source files and mappings are unchanged, resume using recorded ranges and file metadata. Register a new source identity for added or replaced files. Keep old tasks and output without modifying existing export results.

Retain native success, failure, unresolved dependencies, original errors and checkpoints. Completed-run resume reads native records and file metadata without checking exported content for counts, JSON, UTF-8, hashes, redecoding or trial import.

Output Files

Output retains actual source coordinates, mappings, candidates and missing dependencies. Directory mode also records namespace/UUID; single-file mapping does not automatically establish business attribution.