Backblaze B2 chunk size exceeded

[oscar-b]

Bug Description

Chunk size of 5242880 exceeds 1 MiB maximum.

Environment

Litestream version:

v0.5.0-test.2

Operating system & version:

Installation method:

Docker litestream/litestream:0.5.0-test.2

Storage backend:

S3 Backblaze B2

Steps to Reproduce

1. Step one
2. Step two
3. Step three

Expected behavior:

Actual behavior:

Configuration

litestream.yml

dbs:
  - path: /data/data.sqlite
    replicas:
      - type: s3
        bucket: bucket
        path: prod
        endpoint: https://s3.eu-central-003.backblazeb2.com
        region: eu-central-003
        force-path-style: true
        part-size: 1MB
        concurrency: 10
        sync-interval: 30s
        access-key-id: "-"
        secret-access-key: "-"

Logs

Log output

time=2025-09-14T23:29:38.546Z level=INFO msg=litestream version=v0.5.0-test.2 level=""
time=2025-09-14T23:29:38.547Z level=INFO msg="initialized db" path=/data/data.sqlite
time=2025-09-14T23:29:38.547Z level=INFO msg="replicating to" type=s3 sync-interval=30s bucket=bucket path=prod region=eu-central-003 endpoint=https://s3.eu-central-003.backblazeb2.com
time=2025-09-14T23:29:38.547Z level=INFO msg="starting compaction monitor" level=1 interval=5m0s
time=2025-09-14T23:29:38.547Z level=INFO msg="starting compaction monitor" level=9 interval=24h0m0s
time=2025-09-14T23:29:38.547Z level=INFO msg="starting compaction monitor" level=2 interval=1h0m0s
time=2025-09-14T23:29:41.425Z level=ERROR msg="compaction failed" level=9 error="s3: upload to prod/0009/0000000000000001-0000000000000001.ltx: upload multipart failed, upload id: 4_z169cefd3ae4809039f51021c_f239fafc2d9820704_d20250914_m232941_c003_v0312029_t0040_u01757892581189, cause: operation error S3: UploadPart, https response error StatusCode: 400, RequestID: b5daa1287affd177, HostID: aNiNj5WZAMwdlpTi0OQwzI2aIMT4yB2Op, api error InvalidArgument: Chunk size of 5242880 exceeds 1 MiB maximum."

Additional Context

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