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https://issues.apache.org/jira/browse/IGNITE-26294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Polovtsev reassigned IGNITE-26294:
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Assignee: Aleksandr Polovtsev
> Implement segment file compaction
> ---------------------------------
>
> Key: IGNITE-26294
> URL: https://issues.apache.org/jira/browse/IGNITE-26294
> Project: Ignite
> Issue Type: Improvement
> Reporter: Ivan Bessonov
> Assignee: Aleksandr Polovtsev
> Priority: Major
> Labels: ignite-3
>
> Segment truncation is the process of copying the segment into a new segment
> files with the same number, but with an incremented generation. New
> generation of the file should not have any information about already
> truncated or reset data.
> Only relevant log entries should be left there. The best case is when there
> are no such entries and an entire file must be deleted, then we don't need to
> increment the generation.
> Compaction process should also generate an index file with incremented
> generation, and update all the in-memory metadata to reflect the generation
> increment. When everything's done, original segment and its index file must
> be deleted.
> We're not integrating this mechanism yet, only implementing it and cover it
> with test.
> There must be a lot of test, including a concurrent read from the segment
> that we're compacting/deleting.
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