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Per-catalog auth state is shared: commit_table mutates the session, and cached S3FileSystem instances share a signer

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@jaideeppyne 已經在處理了。

開始於 2026年9月16日。

  • #3976 來自 @jaideeppyne —— 未關閉

評估

難度
4/5
預估耗時
3-5 天
新手友好度
52/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
aws, python

研究方向

Start by tracing RestCatalog.commit_table and FileIO.get_fs, including the fsspec S3FileSystem instance cache and botocore event registration shown in the issue. Verify isolation with requests from multiple tables and catalogs: table tokens must not persist on the shared session, and each catalog must retain its own signer even when filesystem constructor arguments match.

由索引模型根據 Issue 內容生成。

描述

bug

Two places where authentication state configured for one catalog or table persists onto another.

1. commit_table mutates the shared session's headers

headers = self._session.headers            # the live session mapping, not a copy
if table_token := table.config.get(TOKEN):
    headers[AUTHORIZATION_HEADER] = f"{BEARER_PREFIX} {table_token}"

self._session.headers is the session's own mapping, so assigning into it persists the table-scoped token on the session. Every subsequent request from that RestCatalog carries it, including requests for other tables.

2. fsspec-cached S3FileSystem instances share one signer registration

fs = S3FileSystem(**s3_fs_kwargs)
for event_name, event_function in register_events.items():
    fs.s3.meta.events.unregister(event_name, unique_id=1925)
    fs.s3.meta.events.register_last(event_name, event_function, unique_id=1925)

The signer is registered as a botocore event handler after construction, under a fixed unique_id. It is not part of s3_fs_kwargs, and fsspec caches filesystem instances by constructor arguments (skip_instance_cache is not set). Two catalogs whose anon / client_kwargs / config_kwargs match therefore receive the same S3FileSystem object, and the second unregister + register_last replaces the first catalog's signer with its own.

Note the per-thread lru_cache in get_fs is not involved — _thread_locals is an instance attribute, so that cache is already per-FileIO. The sharing comes from fsspec's instance cache.


Issue investigation generated via claude, reviewed by Sung, Kevin, Fokko.

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環境準備

  • 沒有 Dockerfile 或 Docker Compose 檔案
  • 有 Pull Request 範本
  • 沒有貢獻指南

從這裡開始

  1. 先讀完整個 Issue,再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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