[Java] Unexpected Allocator states created after allocating buffer whose AllocationManager has different size from the requested size
- 主要言語
- Java
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説明
If a buffer with altered AllocationManager size (which means, the size is different from request size) is created from a Allocator, then allocator still adds the request size rather than the altered size to its accountant. As a result inconsistency will be made once the buffer is getting destroyed because at that time the actual buffer size is used for releasing.
The predefined AllocationManager implementations don't make such inconsistencies since they always grant chunks within the request size. However we have [documented](https://github.com/apache/arrow/blob/e5f3e04b4b80c9b9c53f1f0f71f39d9f8308dced/java/memory/memory-core/src/main/java/org/apache/arrow/memory/AllocationManager.java#L184-L191) that the actual size can be altered from request size in custom implementations of AllocationManager. So this kind of customization should be supported.
**Reporter**: [Hongze Zhang](https://issues.apache.org/jira/browse/ARROW-14034) / @zhztheplayer
**Assignee**: [Hongze Zhang](https://issues.apache.org/jira/browse/ARROW-14034) / @zhztheplayer
#### PRs and other links:
- [GitHub Pull Request apache/arrow#11182](https://github.com/apache/arrow/pull/11182)
**Note**: *This issue was originally created as [ARROW-14034](https://issues.apache.org/jira/browse/ARROW-14034). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*
コントリビューションガイド
調査の方向性
Issue にリンクされている AllocationManager のサイズに関するドキュメントから始め、次にバッファーの作成時と破棄時における allocator の記録処理を追跡してください。すでに進行中の作業については PR apache/arrow#11182 を確認してください。AllocationManager のカスタムサイズによって、割り当てと解放の間で allocator の記録が不整合にならなくなれば完了です。
索引モデルが issue の本文から書いたものです。
評価
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- java
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- backend
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- 25/100