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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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Summary: Support split-file page store (was: Support splt-file page store)
> Support split-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
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> *Notes*
> Description may not be complete.
> *Goal*
> To implement a new checkpoint (described in IGNITE-15818), we will introduce
> a new entity *DeltaFilePageStore*, which will be created for each partition
> at each checkpoint and removed after merging with the *FilePageStore* (the
> main partition file) using the compacter.
> *DeltaFilePageStore* 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 *DeltaFilePageStore* 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
> *DeltaFilePageStore* (the newest one).
> How pages will be read by *pageId -> pageIdx*:
> * Interrogates the class *DeltaFilePageStore* 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 *DeltaFilePageStore* 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*;
> * In each partition and delta file we will store the
> *org.apache.ignite.internal.storage.pagememory.io.PartitionMetaIo*, which
> will be the first page in this file, and it will be special;
> ** We will not store it in *PageMemory* (we will not let it be dirty) for
> optimization and will write it immediately to the delta file at the
> checkpoint and at the merge with the partition file by the compactor;
> ** Instead of the allocation index, we will store the logical size of the
> partition, which we will store in the *PartitionMetaIo*;
> * We will store the list of *pageIdx* in the header of the delta file.
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