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https://issues.apache.org/jira/browse/IGNITE-5322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066476#comment-16066476
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Dmitriy Pavlov commented on IGNITE-5322:
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Additionally Swich Segment record (and its WAL pointer) writting was fixed in
IGNITE-5598.
> Improve WAL record/iterator structure
> -------------------------------------
>
> Key: IGNITE-5322
> URL: https://issues.apache.org/jira/browse/IGNITE-5322
> Project: Ignite
> Issue Type: Improvement
> Components: cache
> Affects Versions: 2.1
> Reporter: Alexey Goncharuk
> Assignee: Alexey Goncharuk
> Labels: important
> Fix For: 2.1
>
>
> Currently, we rely on the WAL files layout and zero-ing to make a decision
> when to stop the iteration.
> Instead, we should write a WAL Pointer to each record with it's position in
> the file. This will allow us to verify that we are reading a consistent
> records sequence and should also remove a requirement for zero-clean WAL
> segment.
> When iterating over the WAL, we should calculate expected next WAL pointer
> and check that read pointer is equal to the read. If we found a difference,
> this means that we encountered a stale segment and can stop the iteration.
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