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From "Alexey Goncharuk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-5322) Improve WAL record/iterator structure
Date Mon, 29 May 2017 11:16:04 GMT
Alexey Goncharuk created IGNITE-5322:
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             Summary: 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
             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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