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Posted to dev@ignite.apache.org by "Alexey Goncharuk (JIRA)" <ji...@apache.org> on 2017/05/29 11:16:04 UTC
[jira] [Created] (IGNITE-5322) Improve WAL record/iterator
structure
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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