Is gofs send all files or only the difference ? about gofs

[mstmdev]

There are some optimizations for the big file in the universal scene.

The gofs will generate some checkpoints to calculate the file chunk hash value when the file is modified. You can change
the -checkpoint_count and -chunk_size flags to control the checkpoints, and for more information see also the checksum section.

For example, execute the following command to output the file checkpoints with default setting:

$ gofs -source=go1.18.3.linux-amd64.tar.gz -checksum

Output:

[
    {
        "offset": 1048576,
        "hash": "a9168dd0ef9e6cdfccb3b71de077ec73"
    },
    {
        "offset": 13631488,
        "hash": "f59a9759d0dfe1a149568cb40ad4af4d"
    },
    {
        "offset": 27262976,
        "hash": "79711c44daf0a2e5479c108db7568872"
    },
    {
        "offset": 40894464,
        "hash": "9c89d776454ec8f03ba916e10e158455"
    },
    {
        "offset": 54525952,
        "hash": "36ace0da4eae494ab6a404c2879098a6"
    },
    {
        "offset": 68157440,
        "hash": "8d2fc7bb6e4b409f54e0a116f3690ea9"
    },
    {
        "offset": 81788928,
        "hash": "96f11fa855f368a56f170cab6f7b0a89"
    },
    {
        "offset": 95420416,
        "hash": "11127168e9364025a1ae0524a0154d2b"
    },
    {
        "offset": 109051904,
        "hash": "e215df2b5fe8e34ec3ad8f354db62039"
    },
    {
        "offset": 122683392,
        "hash": "918aea633289b221faea259c2a50c5f1"
    },
    {
        "offset": 136314880,
        "hash": "147792aea5544021114fd3d44478c3f0"
    },
    {
        "offset": 141748419,
        "hash": "0dec4243438f5c1c40706d5c6d843ac7"
    }
]

The gofs will compare the local source file checkpoints with the destination file checkpoints and sync the data chunks after the last checkpoint offset is hit.