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https://issues.apache.org/jira/browse/IGNITE-17230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kirill Tkalenko updated IGNITE-17230:
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Description:
*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.
was:
*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).
To read a page by *pageId -> pageIdx*, at the beginning we will try to find it
among the *DelataFilePageStore* (from the youngest to the oldest) and if we do
not find it among them, we will read from *FilePageStore*.
> 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
> 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.
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