Dmitriy Pavlov commented on IGNITE-7920:

It is required to check if WAL iterator uses underlying buffer to read entries.
It is also required to check if some information may be cached during restore, 
to avoid read twice.

> Research local crash recovery speed after stop in the middle of checkpoint
> --------------------------------------------------------------------------
>                 Key: IGNITE-7920
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7920
>             Project: Ignite
>          Issue Type: Task
>          Components: persistence
>            Reporter: Dmitriy Pavlov
>            Assignee: Dmitriy Pavlov
>            Priority: Major
> When using Ignite as a database on one node, I observed that the recovery 
> time using the WAL exceeds the time between checkpoints.
> Ignite logs message that it is restored after stopping in the middle of the 
> checkpoint 
> I use the frequency of CP - setCheckpointFrequency (60 * 1000), but at server 
> with HDD and heavy IO load. At least 16 minutes required to restore Ignite 
> after stop.
> Server monitoring states that  high rate of IOPS ocurred and it is constraint 
> (there is plenty of CPU/RAM)

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