Azureblob upload may be slow when reading from non-memory source #18410
Description
Bug Report
What version of TiKV are you using?
Current master
What operating system and CPU are you using?
not relative
Steps to reproduce
- Enable a backup to azure blob storage.
- Write enough contents to TiKV.
- Wait a flush.
What did you expect?
Flush should be finished in a reasonable time.
What did happened?
A 400MiB flush takes about 17m. A cpu core was fully used during flushing.
probably cc #13674
tikv/components/cloud/azure/src/azblob.rs
Line 315 in b49144a