---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: hedged_request_fs
excerpt: |
  DuckDB Community Extensions
  Provides hedged request for filesystem operations

extension:
  name: hedged_request_fs
  description: Provides hedged request for filesystem operations
  version: 0.3.0
  language: C++
  build: cmake
  license: MIT
  excluded_platforms: "wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64;windows_amd64_mingw"
  maintainers:
    - dentiny

repo:
  github: dentiny/duckdb-hedged-request
  andium: a94e1b63e9b1e6f94c6c7debbf1d49bc28f510f7
  ref: 535957a126e3978273a6283ffddf0d73e7a298fe

docs:
  hello_world: |
    SELECT * FROM hedged_fs_list_filesystems();
    SELECT hedged_fs_wrap('S3FileSystem');
  extended_description: |
    This extension enhances DuckDB filesystem capability by hedged request to cut down tail latency.
    - It allows users to wrap an existing filesystem, which achieves hedged request with no user code change.
    - It supports all metadata and directory operations, the slow ones of which will be attempted hedged request to cut down tail latency.
    - Users are able to tune hedged requests trigger thresholds and max attempt counts.

extension_star_count: 2
extension_star_count_pretty: 2
extension_download_count: 1682
extension_download_count_pretty: 1.7k
image: '/images/community_extensions/social_preview/preview_community_extension_hedged_request_fs.png'
layout: community_extension_doc
---
### Compatibility Matrix

This table covers all DuckDB releases that have not reached [end-of-life](https://duckdb.org/release_calendar), including LTS releases, and shows the 2 most recent patch releases of each. Older patch releases are not listed, but the extension may be available for them as well.

<div class="extension_compatibility_table"></div>

| Platform | 1.4.4 | 1.4.5 | 1.5.5 | 1.5.6 | 2.0.0 |
| :--- | :---: | :---: | :---: | :---: | :---: |
| Linux AMD64 | ✅ | ❌ | ✅ | ✅ | ✅ |
| Linux ARM64 | ✅ | ❌ | ✅ | ✅ | ✅ |
| macOS AMD64 | ✅ | ❌ | ✅ | ✅ | ✅ |
| macOS ARM64 | ✅ | ❌ | ✅ | ✅ | ✅ |
| Windows AMD64 | ❌ | ❌ | ❌ | ❌ | ❌ |
| Windows ARM64 | ❌ | ❌ | ❌ | ❌ | ❌ |
| WebAssembly | ❌ | ❌ | ❌ | ❌ | ❌ |

### Installing and Loading
```sql
INSTALL {{ page.extension.name }} FROM community;
LOAD {{ page.extension.name }};
```

{% if page.docs.hello_world %}
### Example
```sql
{{ page.docs.hello_world }}```
{% endif %}

{% if page.docs.extended_description %}
### About {{ page.extension.name }}
{{ page.docs.extended_description }}
{% endif %}
### Added Functions

<div class="extension_functions_table"></div>

|       function_name        | function_type |                                        description                                        | comment |                   examples                    |
|----------------------------|---------------|-------------------------------------------------------------------------------------------|---------|-----------------------------------------------|
| hedged_fs_list_filesystems | table         | Lists the names of all filesystem subsystems currently registered with DuckDB.            | NULL    | [SELECT * FROM hedged_fs_list_filesystems();] |
| hedged_fs_wrap             | scalar        | Wraps a registered filesystem subsystem with hedged requests and returns true on success. | NULL    | [SELECT hedged_fs_wrap('S3FileSystem');]      |

### Overloaded Functions

<div class="extension_functions_table"></div>

This extension does not add any function overloads.

### Added Types

<div class="extension_types_table"></div>

This extension does not add any types.

### Added Settings

<div class="extension_settings_table"></div>

|                   name                    |                                               description                                               | input_type | scope  | aliases | typed_value |
|-------------------------------------------|---------------------------------------------------------------------------------------------------------|------------|--------|---------|-------------|
| hedged_fs_create_directory_delay_ms       | Delay in milliseconds before starting hedged request for CreateDirectory and CreateDirectoriesRecursive | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_delete_delay_ms                 | Delay in milliseconds before starting hedged request for RemoveFile, TryRemoveFile, and RemoveDirectory | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_directory_exists_delay_ms       | Delay in milliseconds before starting hedged request for DirectoryExists operation                      | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_file_exists_delay_ms            | Delay in milliseconds before starting hedged request for FileExists operation                           | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_get_file_size_delay_ms          | Delay in milliseconds before starting hedged request for GetFileSize operation                          | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_get_file_type_delay_ms          | Delay in milliseconds before starting hedged request for GetFileType operation                          | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_get_last_modified_time_delay_ms | Delay in milliseconds before starting hedged request for GetLastModifiedTime operation                  | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_get_stats_delay_ms              | Delay in milliseconds before starting hedged request for Stats operation                                | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_get_version_tag_delay_ms        | Delay in milliseconds before starting hedged request for GetVersionTag operation                        | UBIGINT    | GLOBAL | []      | 3000        |
| hedged_fs_glob_delay_ms                   | Delay in milliseconds before starting hedged request for Glob operation                                 | UBIGINT    | GLOBAL | []      | 5000        |
| hedged_fs_list_files_delay_ms             | Delay in milliseconds before starting hedged request for ListFiles operation                            | UBIGINT    | GLOBAL | []      | 5000        |
| hedged_fs_max_hedged_request_count        | Maximum number of hedged requests to spawn for each operation                                           | UBIGINT    | GLOBAL | []      | 3           |
| hedged_fs_open_file_delay_ms              | Delay in milliseconds before starting hedged request for OpenFile operation                             | UBIGINT    | GLOBAL | []      | 3000        |
| temp_directory                            | Set the directory to which temporary files are written.                                                 | VARCHAR    | GLOBAL | []      | post.db.tmp |