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Make LocalFileSystem an Optional Feature #6055

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tustvold opened this issue Jul 15, 2024 · 5 comments · May be fixed by #6636
Open

Make LocalFileSystem an Optional Feature #6055

tustvold opened this issue Jul 15, 2024 · 5 comments · May be fixed by #6636
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enhancement Any new improvement worthy of a entry in the changelog object-store Object Store Interface

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@tustvold
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Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Currently LocalFileSystem is always provided, and this in turn bring in a dependency on tokio and walkdir. There are scenarios were users may not need LocalFileSystem support and/or may not wish to link in tokio.

Describe the solution you'd like

Add an fs feature flag that is enabled by default and feature gates LocalFilesystem and its dependencies. It is unclear if this would constitute a breaking change, and so it might need to wait for a breaking release

Describe alternatives you've considered

Additional context
@tustvold tustvold added the enhancement Any new improvement worthy of a entry in the changelog label Jul 15, 2024
@tustvold tustvold mentioned this issue Jul 15, 2024
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@alamb
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alamb commented Jul 15, 2024

makes sense to me

@jiacai2050
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Hi, after search(query prompt: use tokio) the source code, I found there is no tokio dependency in local.rs

./*ivy-occur counsel-rg "tokio"*:8:./src/client/token.rs:20:use tokio::sync::Mutex;
./*ivy-occur counsel-rg "tokio"*:10:./src/buffered.rs:33:use tokio::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, ReadBuf};
./*ivy-occur counsel-rg "tokio"*:13:./src/buffered.rs:477:    use tokio::io::{AsyncBufReadExt, AsyncReadExt, AsyncSeekExt, AsyncWriteExt};
./*ivy-occur counsel-rg "tokio"*:24:./src/client/mock_server.rs:31:use tokio::net::TcpListener;
./*ivy-occur counsel-rg "tokio"*:25:./src/client/mock_server.rs:32:use tokio::sync::oneshot;
./*ivy-occur counsel-rg "tokio"*:26:./src/client/mock_server.rs:33:use tokio::task::{JoinHandle, JoinSet};
./*ivy-occur counsel-rg "tokio"*:46:./src/throttle.rs:403:    use tokio::time::Duration;
./*ivy-occur counsel-rg "tokio"*:47:./src/throttle.rs:404:    use tokio::time::Instant;
./*ivy-occur counsel-rg "tokio"*:56:./src/upload.rs:25:use tokio::task::JoinSet;
./*ivy-occur counsel-rg "tokio"*:71:./src/local.rs:219:/// a tokio context, this will use [`tokio::runtime::Handle::spawn_blocking`] to dispatch
./*ivy-occur counsel-rg "tokio"*:101:./src/lib.rs:278://! # use tokio::io::AsyncWriteExt;
./*ivy-occur counsel-rg "tokio"*:102:./src/lib.rs:307://! # use tokio::io::AsyncWriteExt;
./*ivy-occur counsel-rg "tokio"*:103:./src/lib.rs:339://! # use tokio::io::AsyncWriteExt;
./*ivy-occur counsel-rg "tokio"*:104:./src/lib.rs:378://! # use tokio::io::AsyncWriteExt;
./*ivy-occur counsel-rg "tokio"*:105:./src/lib.rs:445://! # use tokio::io::AsyncWriteExt;
./*ivy-occur counsel-rg "tokio"*:109:./src/lib.rs:1082:    /// a tokio context, this will use [`tokio::runtime::Handle::spawn_blocking`] to dispatch
./*ivy-occur counsel-rg "tokio"*:113:./src/lib.rs:1295:    use tokio::io::AsyncWriteExt;
./*ivy-occur counsel-rg "tokio"*:124:./src/limit.rs:32:use tokio::sync::{OwnedSemaphorePermit, Semaphore};
./*ivy-occur counsel-rg "tokio"*:125:./src/limit.rs:283:    use tokio::time::timeout;

@alamb
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alamb commented Jul 17, 2024 •
edited
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Here are a few:

arrow-rs/object_store/src/local.rs

Line 564 in 199ce91

if tokio::runtime::Handle::try_current().is_err() {

arrow-rs/object_store/src/local.rs

Line 846 in 199ce91

match tokio::runtime::Handle::try_current() {

Github search fu suggests there are 32 uses: https://github.com/search?q=repo%3Aapache%2Farrow-rs+tokio+path%3A%2F%5Eobject_store%5C%2F%2F+path%3A%2F%5Eobject_store%5C%2Fsrc%5C%2Flocal%2F&type=code

Screenshot 2024-07-17 at 5 42 01 AM

@jiacai2050
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Thanks for pointing out.

If fs feature in enabled by default, this is not a breaking change for users?

@tustvold
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People could have disabled default features and it would be a breaking change for them

@alamb alamb added the object-store Object Store Interface label Jul 18, 2024
@tustvold tustvold mentioned this issue Oct 21, 2024
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@Turbo87 Turbo87 linked a pull request Oct 28, 2024 that will close this issue
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object_store: Add enabled-by-default "fs" feature Turbo87/arrow-rs
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@alamb @tustvold @jiacai2050