mbutrovich commented on code in PR #7221:
URL: https://github.com/apache/datafusion-comet/pull/7221#discussion_r4391386702
##########
spark/src/main/scala/org/apache/comet/objectstore/AbfsAuthResolver.scala:
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@@ -467,6 +469,42 @@ private[comet] object AbfsAuthResolver extends Logging {
Markers.ERROR_MESSAGE -> message)
}
+ /**
+ * Why the native store cannot read `uri` under `outcome`, or None when it
can: a mechanism
+ * Hadoop named that runs Java code per request, a built-in OAuth provider
with no
+ * `object_store` counterpart, or a resolution that failed. All are known on
the driver, so the
+ * scan falls back to Spark's own reader, which authenticates through
hadoop-azure, instead of
+ * planning natively and failing every task.
+ */
+ def nativeFallbackReason(uri: URI, outcome: Outcome): Option[String] = {
+ // The container and host only: a password in the user info stays out of
the reason.
+ val authority = Option(uri.getRawAuthority).getOrElse("")
+ val at = authority.lastIndexOf('@')
+ val safeAuthority =
+ if (at < 0) authority
+ else authority.substring(0, at).takeWhile(_ != ':') +
authority.substring(at)
+ val location = s"${uri.getScheme}://$safeAuthority"
+ def unsupported(mechanism: String): String =
+ s"Native scan does not support ABFS authentication $mechanism for
$location"
+ outcome match {
+ case Declined(authType, providerClass, assertionProviderClass) =>
+ val classes = providerClass.map(c => s" with provider
$c").getOrElse("") +
+ assertionProviderClass.map(c => s" and client assertion provider
$c").getOrElse("")
+ Some(unsupported(s"auth type $authType$classes"))
+ case Resolved(
+ AuthTypes.OAUTH,
+ Some(c @ (Providers.REFRESH_TOKEN | Providers.USER_PASSWORD)),
+ _) =>
Review Comment:
> I went with the probe. `NativeBase.abfsStoreError(url, keys, values)` runs
`azure::create_store`, the same call the scan makes, on the options `toOptions`
builds for a `Resolved` outcome.
Thanks, this addresses both points. At the head commit
`clientCredsEndpointUsable` and the copied endpoint table are gone, and the
`%2e%2e` and `\` endpoints stay native, matching the [`oauth_endpoint_parts`
cases](https://github.com/apache/datafusion-comet/blob/beda9508f907a6b00bf94bb30c265b7b95295e65/native/core/src/parquet/objectstore/azure.rs#L1056-L1058).
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