checkBlockSizeReached zero record size perf issue
- 主要语言
- Java
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- 3 天 12 小时
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描述
Parquet checks Block size after writing records to decide when it shall flush. This is relatively expensive, so it estimates the next check based on record size, record count etc.
For small records (less than 1byte after compression), the average record size is 0 after integer division. This caused overflow when calculating the next record count for block size check, resulting block size being checked for every record.
**Reporter**: [Huicheng Song](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=songhuicheng)
**Note**: *This issue was originally created as [PARQUET-2199](https://issues.apache.org/jira/browse/PARQUET-2199). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*
贡献指南
这个仓库没有索引到贡献指南
调研方向
首先跟踪 checkBlockSizeReached 以及 issue 中描述的块大小估算逻辑。使用小于一个压缩字节的记录复现该情况,然后验证计算不会溢出,并且不会针对每条记录执行块大小检查。
由索引模型根据 Issue 内容生成。
评估
- 技术栈
- java
- 领域
- data-engineering, performance
- Issue 类型
- 缺陷
- 难度
- 2/5
- 预计耗时
- 1-3 小时
- 活跃度
- 停滞
- 描述清晰度
- 基本清楚
- 新手友好度
- 45/100