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https://issues.apache.org/jira/browse/IGNITE-17267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563352#comment-17563352
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Roman Puchkovskiy commented on IGNITE-17267:
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The patch looks good to me, thank you for the contribution
> Preparing a checkpoint for a DeltaFilePageStore
> -----------------------------------------------
>
> Key: IGNITE-17267
> URL: https://issues.apache.org/jira/browse/IGNITE-17267
> Project: Ignite
> Issue Type: Improvement
> Reporter: Kirill Tkalenko
> Assignee: Kirill Tkalenko
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0.0-alpha6
>
> Time Spent: 4h 50m
> Remaining Estimate: 0h
>
> To implement the *DeltaFilePageStore*, we need to prepare a checkpoint for
> their creation.
> What should be done:
> # Sort dirty pages (*FullPageId*) by *groupId*, *partitionId*, *pageIdx*;
> # In several threads, write dirty pages in batches for each partition and
> know the number of these pages.
> What can we look at:
> *
> *org.apache.ignite.internal.pagememory.persistence.checkpoint.CheckpointWorkflow#beginCheckpoint*
> *
> *org.apache.ignite.internal.pagememory.persistence.checkpoint.CheckpointWorkflow#splitAndSortCheckpointPagesIfNeeded*
> *
> *org.apache.ignite.internal.pagememory.persistence.checkpoint.Checkpointer#writePages*
> Some implementation notes:
> * We can replace *CheckpointWorkflow#parallelSortThreshold* with a constant
> at 40k, according to the
> [paper|https://www.researchgate.net/publication/331742843_Threshold_Analysis_and_Comparison_of_Sequential_and_Parallel_Divide_and_Conquer_Sorting_Algorithms].
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