Large file uploads do not send src_last_modified_millis like small uploads do
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 78/100
Research direction
Start in core/src/main/java/com/backblaze/b2/client/structures/B2StartLargeFileRequest.java, in buildFrom (around lines 125-157), and compare it with the small-file path in core/src/main/java/com/backblaze/b2/client/B2StorageClientWebifierImpl.java (around lines 306-315). Check whether the content source's last-modified millis is copied into the builder for large files. Done when a large upload from a B2FileContentSource carries src_last_modified_millis in its file info, matching the small-file behaviour, with a test covering it.
Written by the indexing model from the issue text.
Description
What happens
For a small file, the SDK sends the content source's last-modified time as X-Bz-Info-src_last_modified_millis, and the README says the SDK adds this field on uploads. For a large file, B2StartLargeFileRequest.buildFrom copies the file info, sha1 and other settings but never reads the source's last-modified time, so the field is missing on large files uploaded through uploadLargeFile.
Where
core/src/main/java/com/backblaze/b2/client/structures/B2StartLargeFileRequest.java:125-157 (buildFrom); compare core/src/main/java/com/backblaze/b2/client/B2StorageClientWebifierImpl.java:306-315 (small file path) and README.md:36.
Why it matters
Impact: Wrong request or result (metadata silently missing), silent. Severity: High, because it happens on the normal path for every large upload whose content source provides a last-modified time, and the only workaround is setting src_last_modified_millis by hand through setCustomFields.
How to check
Found by reading the code, not reproduced. Upload a large file from a B2FileContentSource and read its file info: by reading, src_last_modified_millis is only set by the small-file path. In buildFrom, calling orig.getContentSource().getSrcLastModifiedMillisOrNull() and builder.setSrcLastModifiedMillisOrNull(...) when non-null would match the small-file behaviour.
Version
Seen at v6.5.0. Present on the default branch: present.
- Dominant language
- Java
- Stars
- 103
- Forks
- 23
- Avg merge
- 5d 8h
- Merged PRs (30d)
- 3
Getting set up
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First steps
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