Alexey Goncharuk commented on IGNITE-7698:

Pushed another commit: 7288828c595d5f6b9b59eae4d2c54d16d9770833

> Page read during replacement should be outside of segment write lock
> --------------------------------------------------------------------
>                 Key: IGNITE-7698
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7698
>             Project: Ignite
>          Issue Type: Improvement
>          Components: persistence
>    Affects Versions: 2.1
>            Reporter: Alexey Goncharuk
>            Assignee: Dmitriy Pavlov
>            Priority: Major
>             Fix For: 2.5
> When a page is acquired, if it needs to be read from disk, we read it inside 
> the segment write lock which blocks other threads from acquiring pages that 
> are already in memory.
> This can be easily avoided: once we initialized the page's being loaded RW 
> lock, we can immediately acquire the write lock - no deadlocks can happen 
> here. Afterwards, we can release the segment write lock and read the page.
> The change seems to be very local.

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