[Java] Slow LZ4 compression using java Arrow 12.0.0
- 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
### Describe the bug, including details regarding any error messages, version, and platform.
500 MB of arrow data took a few hours to compress. A 5GB selection ran for a couple of days and did not complete. The one that did worked fine once it was done and I was able to read it back in and use it. Without compression, data writes out fine in a much shorter time frame for both. Using the following code to set up my writer:
```
ArrowFileWriter writer = new ArrowFileWriter(root, null, Channels.newChannel(fos), new HashMap<>(), IpcOption.DEFAULT, CommonsCompressionFactory.INSTANCE, CompressionUtil.CodecType.LZ4_FRAME));
```
Running code with:
```
java -version
openjdk version "17.0.7" 2023-04-18
OpenJDK Runtime Environment GraalVM CE 22.3.2 (build 17.0.7+7-jvmci-22.3-b18)
OpenJDK 64-Bit Server VM GraalVM CE 22.3.2 (build 17.0.7+7-jvmci-22.3-b18, mixed mode, sharing)
```
### Component(s)
Java
貢獻指南
研究方向
首先,使用提供的 Java 和 OpenJDK 版本,透過 ArrowFileWriter、CommonsCompressionFactory 和 CompressionUtil.CodecType.LZ4_FRAME 重現回報的壓縮行為。比較回報資料大小下的壓縮與未壓縮寫入時間;確定 LZ4 執行時間過長的原因,並驗證問題已解決後,即視為完成。
由索引模型根據 Issue 內容生成。
評估
- 技術堆疊
- java
- 領域
- performance
- Issue 類型
- 缺陷
- 難度
- 4/5
- 預估耗時
- 3-5 天
- 活躍度
- 停滯
- 描述清晰度
- 需要釐清
- 新手友好度
- 25/100