apache/iceberg

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

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#15,924 opened on 2026年4月9日

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 (1 comment) (0 reactions) (1 assignee)Java (5,146 stars) (1,915 forks)batch import
coregood first issueimprovement

説明

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

コントリビューターガイド

技術スタック
java
領域
performancedatabase
Issue 種別
feature
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-3 hours
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
blocked
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
JavaApache Iceberg basicsStreaming concepts
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
30
調査方針
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.