[jira] [Assigned] (IGNITE-26294) Implement segment file compaction

["Aleksandr Polovtsev (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-26294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksandr Polovtsev reassigned IGNITE-26294:
--------------------------------------------

    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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