Large file uploads do not send src_last_modified_millis like small uploads do

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Issue 类型
缺陷
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技术栈
java
领域
cloud

调研方向

从 core/src/main/java/com/backblaze/b2/client/structures/B2StartLargeFileRequest.java 中的 buildFrom(约第 125-157 行)开始,并将其与 core/src/main/java/com/backblaze/b2/client/B2StorageClientWebifierImpl.java(约第 306-315 行)中的小文件路径进行比较。检查内容源的最后修改时间(毫秒)是否被复制到大文件的构建器中。当来自 B2FileContentSource 的大文件上传在其文件信息中携带 src_last_modified_millis,与小文件的行为一致,并且有测试覆盖此行为时,即为完成。

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描述

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.

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Java
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