Bug #109133 Parallel replication causes massive delays
Submitted: 18 Nov 2022 3:45 Modified: 27 Dec 2022 9:46
Reporter: chengqing hu Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: Documentation Severity:S3 (Non-critical)
Version:8.0 OS:Any
Assigned to: Jon Stephens CPU Architecture:Any

File: Maximum allowed size is 3MB.
Description:
Privacy:

If the data you need to attach is more than 3MB, you should create a compressed archive of the data and a README file that describes the data with a filename that includes the bug number (recommended filename: mysql-bug-data-109133.zip) and upload one to sftp.oracle.com. A free Oracle Web (SSO) account (the one you use to login bugs.mysql.com) and a client that supports SFTP are required in order to access the SFTP server.

To upload the file to sftp.oracle.com:

  1. Open an SFTP client and connect to sftp.oracle.com. Specify port 2021 and remote directory /support/incoming/.
  2. Log in with your newly created Oracle Web account (email address) and password.
  3. Upload the archive to /support/incoming.
  4. Once you have uploaded the file, add a comment to this bug to notify us about it.
Example: sftp -oPort=2021 -oUser=email sftp.oracle.com:/support/incoming

Usage Notes: This directory is unlistable, which means that once you have uploaded your file, you will not be able to see it. A file cannot be uploaded more than once with the same filename. The filename must be changed before attempting to upload the file again. The filename should always start with mysql-bug- prefix. Files are retained on the SFTP server for 7 days and then permanently removed.

[22 Nov 2022 10:17] Max Irgiznov 
Single thread replica

Attachment: flamegraph_mth.svg (image/svg+xml, text), 954.56 KiB.
[22 Nov 2022 10:18] Max Irgiznov 
Single thread replica

Attachment: flamegraph_single.svg (image/svg+xml, text), 1.10 MiB.
[22 Nov 2022 10:20] Max Irgiznov 
pt-pmp profilig on mth replica

Attachment: pt-pmp.svg (image/svg+xml, text), 105.96 KiB.
[25 Nov 2022 9:59] Max Irgiznov 
Hello! I ran the recommended tests.

Attachment: flamegraphs.zip (application/x-zip-compressed, text), 367.58 KiB.