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https://issues.apache.org/jira/browse/IGNITE-26216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kirill Tkalenko updated IGNITE-26216:
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Description:
To correctly fix problems related to partition deletion, we need to compare
partition generations, so as not to copy a page for a checkpoint, for example.
But for this, we need to store the partition generation somewhere at the time
of creating a page in memory or updating it due to detection that it has become
obsolete.
It was discovered that the page header has an unused field
"RELATIVE_PTR_OFFSET", which essentially stores only flags. I suggest using it
and storing the partition generation there instead of not using a relative
pointer.
Also within this ticket it is proposed to make some changes, maybe refactorings
and improving documentation.
was:
To correctly fix problems related to partition deletion, we need to compare
partition generations, so as not to copy a page for a checkpoint, for example.
But for this, we need to store the partition generation somewhere at the time
of creating a page in memory or updating it due to detection that it has become
obsolete.
It was discovered that the page header has an unused field "123", which
essentially stores only flags. I suggest using it and storing the partition
generation there instead of not using a relative pointer.
Also within this ticket it is proposed to make some changes, maybe refactorings
and improving documentation.
> Add partition generation to in-memory page header for PersistentPageMemory
> --------------------------------------------------------------------------
>
> Key: IGNITE-26216
> URL: https://issues.apache.org/jira/browse/IGNITE-26216
> Project: Ignite
> Issue Type: Improvement
> Reporter: Kirill Tkalenko
> Assignee: Kirill Tkalenko
> Priority: Major
> Labels: ignite-3
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> To correctly fix problems related to partition deletion, we need to compare
> partition generations, so as not to copy a page for a checkpoint, for
> example. But for this, we need to store the partition generation somewhere at
> the time of creating a page in memory or updating it due to detection that it
> has become obsolete.
> It was discovered that the page header has an unused field
> "RELATIVE_PTR_OFFSET", which essentially stores only flags. I suggest using
> it and storing the partition generation there instead of not using a relative
> pointer.
> Also within this ticket it is proposed to make some changes, maybe
> refactorings and improving documentation.
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