[IGNITE-17295] Preparing a PartitionMetaIo for a DeltaFilePageStore

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-beta1
• Labels: ignite-3
• Epic Link: New PageMemory Persistent Store
• Assignee: Kirill Tkalenko
• Reporter: Kirill Tkalenko
• Reviewer: Ivan Bessonov
• Created: 04/Jul/22 08:46
• Updated: 13/Oct/22 12:01
• Resolved: 20/Jul/22 08:16

Description

To implement the DeltaFilePageStore, we need to prepare org.apache.ignite.internal.storage.pagememory.io.PartitionMetaIo:

• PartitionMetaIo should not be in PageMemory - allows us to shrink off-heap memory;
• FilePageStore#allocatedBytes to make it logical and stored in PartitionMetaIo - we can store the page index or the number of pages or the number of bytes;
• PartitionMetaIo will be written at each checkpoint - in the future it will be written to DeltaFilePageStore and the merger will be written to *FilePageStore";
• PartitionMetaIo must always be the first (pageIdx == 0) page in DeltaFilePageStore and FilePageStore and must be able to read and write to disk on its own.

Issue Links

• is related to: IGNITE-17230 Support split-file page store
• links to: GitHub Pull Request #920