[IGNITE-7606] Write removed dirty page during replacement without holding segment write lock

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.5
• Component/s: persistence
• Assignee: Dmitry Pavlov
• Reporter: Dmitry Pavlov
• Created: 01/Feb/18 16:47
• Updated: 14/Feb/18 17:10
• Resolved: 08/Feb/18 19:49

Description

If a dirty page under the checkpoint is found, following is suggested

• copy it to the local thread buffer,
• and then after performing all actions in region for evicting the page
• finish execution allocatePage()/acquirePage()
• unlock segment to allow other workers to operate
• perform the pwrite() call based on the data from local buffer

Now if page eviction started there is possible drops to 0 put/seconds in case a lot of threads are watiting for same segment lock.

Issue Links

• relates to: IGNITE-7698 Page read during replacement should be outside of segment write lock
• links to: GitHub Pull Request #3469