[jira] [Assigned] (IGNITE-17230) Support splt-file page store

["Kirill Tkalenko (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-17230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kirill Tkalenko reassigned IGNITE-17230:
----------------------------------------

    Assignee: Kirill Tkalenko

> Support splt-file page store
> ----------------------------
>
>                 Key: IGNITE-17230
>                 URL: https://issues.apache.org/jira/browse/IGNITE-17230
>             Project: Ignite
>          Issue Type: Task
>            Reporter: Kirill Tkalenko
>            Assignee: Kirill Tkalenko
>            Priority: Major
>              Labels: ignite-3
>             Fix For: 3.0.0-alpha6
>
>
> *Notes*
> Description may not be complete.
> *Goal*
> To implement a new checkpoint (described in IGNITE-15818), we will introduce a new entity *DelataFilePageStore*, which will be created for each partition at each checkpoint and removed after merging with the *FilePageStore* (the main partition file) using the compacter.
> *DelataFilePageStore* will consist of:
> * Header (maybe updated in the course of implementation):
> ** Allocation *pageIdx* - *pageIdx* of the last created page;
> * Sorted list of *pageIdx* - allows a binary search to find the file offset for an *pageId -> pageIdx*;
> * Page content - sorted by *pageIdx*.
> What will change for *FilePageStore*:
> * List of class *DelataFilePageStore* will be added (from the newest to the oldest by the time of creation);
> * Allocation index (pageIdx of the last created page) - it will be logical and contained in the header of *FilePageStore*. At node start, it will be read from the header of *FilePageStore* or obtained from the first *DelataFilePageStore* (the newest one).
> How pages will be read by *pageId -> pageIdx*:
> * Interrogates the class *DelataFilePageStore* in order from the newest to the oldest;
> * If not found, then we read page from the *FilePageStore* itself.
> *Some implementation notes*
> * Format of the file name for the *DelataFilePageStore*  is *part-%d-delta-%d.bin* for example *part-1-delta-3.bin* where the first digit is the partition identifier, and the second is the serial number of the delta file for this partition;
> * Before creating *part-1-delta-3.bin*, a temporary file *part-1-delta-3.bin.tmp* will be created at the checkpoint first, then filled, then renamed to *part-1-delta-3.bin*;
> * Since the indexes will be stored in partitions, we can get rid of the code associated with the index partition file;
> * Fix flaky [FilePageStoreManagerTest#testStopAllGroupFilePageStores|https://ci.ignite.apache.org/test/6999203413272911470?currentProjectId=ignite3_Test&branch=%3Cdefault%3E].



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