tustvold commented on code in PR #2906:
URL: https://github.com/apache/arrow-datafusion/pull/2906#discussion_r922481276
##########
datafusion/core/src/datasource/object_store.rs:
##########
@@ -132,19 +149,51 @@ impl ObjectStoreRegistry {
///
/// - URL with scheme `file:///` or no schema will return the default
LocalFS store
/// - URL with scheme `s3://bucket/` will return the S3 store if it's
registered
+ /// - URL with scheme `hdfs://hostname:port` will return the hdfs store if
it's registered
///
pub fn get_by_url(&self, url: impl AsRef<Url>) -> Result<Arc<dyn
ObjectStore>> {
let url = url.as_ref();
- let s = &url[url::Position::BeforeScheme..url::Position::AfterHost];
- let stores = self.object_stores.read();
- let store = stores.get(s).ok_or_else(|| {
- DataFusionError::Internal(format!(
- "No suitable object store found for {}",
- url
- ))
- })?;
-
- Ok(store.clone())
+ // First check whether can get object store from registry
+ let store = {
+ let stores = self.object_stores.read();
+ let s =
&url[url::Position::BeforeScheme..url::Position::BeforeHost];
Review Comment:
More precisely I think it can be stated that object_store only deals with
paths, anything to do with URLs, etc... is an external concern. This avoids URL
handling logic leaking into each of the implementations, where it was being
applied inconsistently (and incorrectly).
I therefore think it would be easy, if this keeps the existing logic of
caching in the registry based on everything before the path part of the URL.
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