apache / apache/arrow-java

[Java] Implement "ArrowBufReadChannel" abstraction and alternate MessageSerializer that uses this

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Type: enhancement
主要語言
Java
星號
94
分支
152
平均合併
3 天 16 小時
30 天內合併 PR
11

描述

The current MessageSerializer implementation is wasteful when used to read an IPC payload that is already in-memory in an `ArrowBuf`. In particular, reads out of a `ReadChannel` require memory allocation

- https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/ipc/message/MessageSerializer.java#L569

- https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/ipc/message/MessageSerializer.java#L290

In C++, we have abstracted memory allocation out of the IPC read path so that zero-copy is possible. I suggest that a similar mechanism can be developed for Java to improve deserialization performance for in-memory messages. The new interface would return `ArrowBuf` when performing reads, which could be zero-copy when possible, but when not the current strategy of allocate-copy could be used

**Reporter**: [Wes McKinney](https://issues.apache.org/jira/browse/ARROW-3192) / @wesm

**Note**: *This issue was originally created as [ARROW-3192](https://issues.apache.org/jira/browse/ARROW-3192). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*

貢獻指南

開啟貢獻指南

研究方向

閱讀 java/vector/src/main/java/org/apache/arrow/vector/ipc/message/MessageSerializer.java 中所引用的第 569 行和第 290 行,以了解目前的 ReadChannel 配置路徑。研究提議的 ArrowBufReadChannel 抽象和替代的 MessageSerializer,並將對記憶體中 ArrowBuf payload 的 zero-copy 讀取,以及配置並複製的 fallback 作為完成標準。

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評估

技術堆疊
java
領域
data-engineering
Issue 類型
功能
難度
5/5
預估耗時
一週以上
活躍度
停滯
描述清晰度
基本清楚
新手友好度
35/100

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