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https://issues.apache.org/jira/browse/IGNITE-13190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17249069#comment-17249069
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Maksim Timonin commented on IGNITE-13190:
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[~sergeychugunov] [~ibessonov] [~mmuzaf]
Hi! I'm was discovering how defragmentation work and found that defragmentation
performed only for single index per table [1]. Is it correct behavior?
Also there is fixed offset 2 to get the index. It may lead to
ArrayOutOfBoundsException in case of rebuilding hash index [2]. I'm not sure
whether this situation is possible or not.
[1]
[IndexingDefragmentation.java#L124|https://github.com/apache/ignite/blob/dc4b71b230e289e5b0d99b00e0632c9d1d0e6e82/modules/indexing/src/main/java/org/apache/ignite/internal/processors/query/h2/defragmentation/IndexingDefragmentation.java#L124]
[2]
[GridH2Table.java#L1163|https://github.com/apache/ignite/blob/2fbbb676386515ea881e4e61f08864d6bc93225a/modules/indexing/src/main/java/org/apache/ignite/internal/processors/query/h2/opt/GridH2Table.java#L1163]
> Core defragmentation functions
> ------------------------------
>
> Key: IGNITE-13190
> URL: https://issues.apache.org/jira/browse/IGNITE-13190
> Project: Ignite
> Issue Type: Sub-task
> Reporter: Sergey Chugunov
> Assignee: Ivan Bessonov
> Priority: Major
> Labels: IEP-47
> Fix For: 2.10
>
> Time Spent: 20h 50m
> Remaining Estimate: 0h
>
> The following set of functions covering defragmentation happy-case needed:
> * Initialization of defragmentation manager when node is started in
> maintenance mode.
> * Information about partition files is gathered by defrag mgr.
> * For each partition file corresponding file of defragmented partition is
> created and initialized.
> * Keys are transferred from old partitions to new partitions.
> * Checkpointer is aware of new partition files and flushes defragmented
> memory to new partition files.
>
> No fault-tolerance code nor index defragmentation mappings are needed in this
> task.
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