tustvold commented on code in PR #2906:
URL: https://github.com/apache/arrow-datafusion/pull/2906#discussion_r922872084
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datafusion/core/src/datasource/object_store.rs:
##########
@@ -132,19 +149,41 @@ 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::BeforePath];
+ stores.get(s).cloned()
+ };
+
+ // If not, then try to detector based on its url.
+ let store = store
Review Comment:
This currently has a thread race, it needs to:
* Acquire the write lock
* Verify that a value hasn't been inserted in the intervening time
* Call the detector
* Add the result
* Drop the write lock
To be honest, this could probably switch to just using a `Mutex` to keep
things simple. There is unlikely to be significant contention to warrant the
RWLock
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