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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).
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*.
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*:
* 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 class header "123" or obtained from the first class "123" (the newest one).
To implement the new checkpoint (described in IGNITE-15818), we need to modify
*FilePageStore*.
A list (from new to old) of *DelataFilePageStore* will be added to its
structure, which will increase after each checkpoint (at its completion) and
decrease after each merge with the *FilePageStore* by "compacter".
*DelataFilePageStore* will contain:
* Sorted list of *pageIdx*: allows by binary search to find the offset in this
file for the requested *pageId -> pageIdx*;
* Allocation Index: *pageIdx* of the last allocated page;
* Pages themselves are sorted by *pageIdx*.
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).
> 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*.
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