apache/iceberg

Core: Stream DV Puffin rewrite in RewriteTablePathUtil to reduce memory pressure

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#15,924 建立於 2026年4月9日

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 (1 留言) (0 反應) (1 負責人)Java (5,146 star) (1,915 fork)batch import
coregood first issueimprovement

描述

Feature Request / Improvement

Description

RewriteTablePathUtil.rewriteDVFile currently rewrites deletion vector (DV) Puffin files by reading all rewritten blobs into an in-memory list before writing them out, which can create unnecessary memory pressure when rewriting larger DV files or files with many blobs.

Suggested improvement

Refactor RewriteTablePathUtil.rewriteDVFile to stream rewritten blobs directly to the output PuffinWriter while iterating through the source blobs, instead of collecting all rewritten blobs into a temporary list first.

Query engine

None

Willingness to contribute

  • I can contribute this improvement/feature independently
  • I would be willing to contribute this improvement/feature with guidance from the Iceberg community
  • I cannot contribute this improvement/feature at this time

貢獻者指南

技術棧
java
領域
performancedatabase
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
blocked
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
JavaApache Iceberg basicsStreaming concepts
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30
研究方向
The issue is to refactor RewriteTablePathUtil.rewriteDVFile to stream blobs instead of collecting them in memory. Examine the existing implementation in the Apache Iceberg repository. Since it is assigned, coordinate with the assignee before starting work. No PRs or additional comments are available yet.
Core: Stream DV Puffin rewrite in RewriteTablePathUtil to reduce memory pressure · apache/iceberg#15924 | Good First Issue