[IGNITE-7584] Smooth decrease WAL write speed if low work segments left

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: persistence
• Assignee: Dmitry Pavlov
• Reporter: Dmitry Pavlov
• Created: 31/Jan/18 12:09
• Updated: 17/Sep/19 17:44
• Resolved: 17/Sep/19 17:44

Description

Smooth decrease of the write speed in WAL when approaching the exhaustion of current segments in the working directory.

Now archiver segment switch involves file copying and may be bottleneck of speed of grid operation.

Now if out of work segments occurs, grid put speed drop down to 0 ops/sec ocurred.

This isssue was fixed under IGNITE-7017 with providing new 'NoArchvier' mode, but in case archiver based WAL is already used by end-user, it is required to have opportunity to smooth decrease speed instead of drop to 0.

Issue Links

• relates to: IGNITE-7533 Throttle writting threads according fsync progress and checkpoint writting speed instead of region fill
• relates to: IGNITE-7017 Reconsider WAL archive strategy
• links to: GitHub Pull Request #3458
• links to: GitHub Pull Request #3458