Alexey Goncharuk created IGNITE-7698:

             Summary: Page read during replacement should be outside of segment 
write lock
                 Key: IGNITE-7698
             Project: Ignite
          Issue Type: Improvement
          Components: persistence
    Affects Versions: 2.1
            Reporter: Alexey Goncharuk
             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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