adnanhemani commented on code in PR #4667:
URL: https://github.com/apache/polaris/pull/4667#discussion_r3416672278


##########
api/openlineage-service/src/main/java/org/apache/polaris/service/lineage/api/PolarisOpenLineageApi.java:
##########
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.polaris.service.lineage.api;
+
+import io.micrometer.core.annotation.Timed;
+import io.micrometer.core.aop.MeterTag;
+import jakarta.annotation.security.RolesAllowed;
+import jakarta.inject.Inject;
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.NotNull;
+import jakarta.ws.rs.Consumes;
+import jakarta.ws.rs.POST;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.core.Context;
+import jakarta.ws.rs.core.Response;
+import jakarta.ws.rs.core.SecurityContext;
+import org.apache.polaris.core.context.RealmContext;
+import org.eclipse.microprofile.faulttolerance.Timeout;
+
+/**
+ * JAX-RS resource for the OpenLineage ingest endpoint.
+ *
+ * <p>Mounted at the standard OpenLineage path ({@code POST /api/v1/lineage}) 
so that any engine
+ * already using the OpenLineage HTTP transport (Spark, Flink, Airflow, Trino, 
dbt) can target
+ * Polaris by URL change alone — no client-side rewriting.
+ *
+ * <p>The body is parsed into a {@link PolarisLineageEvent} which Jackson 
resolves to one of {@code
+ * OfRunEvent} / {@code OfJobEvent} / {@code OfDatasetEvent} based on the 
{@code schemaURL} field.
+ * Unrecognized {@code schemaURL} values fall back to {@code RunEvent}, 
matching Marquez behavior.
+ *
+ * <p>This resource is hand-written rather than generated from the OpenLineage 
JSON Schema because
+ * the OpenAPI generator's Java template does not faithfully translate the 
spec's {@code oneOf}
+ * over event variants.
+ */
+@Path("/api/v1/lineage")

Review Comment:
   The path `/api/v1/lineage` is the standard OpenLineage HTTP transport 
endpoint — it's what Marquez serves and what Spark/Flink/Airflow/dbt/Trino 
target when you set `transport.type=http`. The PR's core value proposition is 
that engines can point at Polaris with a URL change alone; a non-standard path 
defeats that.
   
   That said, the concern about this path becoming the default interpretation 
of "Polaris lineage" is real. With the `OpenLineageIngestProvider` layer the 
internals are unambiguously OL-specific regardless of the path, but the 
external path is still a one-way door. I'll make the OL-specificity explicit in 
the Javadoc and YAML spec. If there's appetite for a broader namespace 
discussion I'm happy to raise it on the dev list — though I'd want to be 
careful not to break wire compatibility in the process.



##########
api/openlineage-service/src/main/java/org/apache/polaris/service/lineage/api/PolarisOpenLineageApi.java:
##########
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.polaris.service.lineage.api;
+
+import io.micrometer.core.annotation.Timed;
+import io.micrometer.core.aop.MeterTag;
+import jakarta.annotation.security.RolesAllowed;
+import jakarta.inject.Inject;
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.NotNull;
+import jakarta.ws.rs.Consumes;
+import jakarta.ws.rs.POST;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.core.Context;
+import jakarta.ws.rs.core.Response;
+import jakarta.ws.rs.core.SecurityContext;
+import org.apache.polaris.core.context.RealmContext;
+import org.eclipse.microprofile.faulttolerance.Timeout;
+
+/**
+ * JAX-RS resource for the OpenLineage ingest endpoint.
+ *
+ * <p>Mounted at the standard OpenLineage path ({@code POST /api/v1/lineage}) 
so that any engine
+ * already using the OpenLineage HTTP transport (Spark, Flink, Airflow, Trino, 
dbt) can target
+ * Polaris by URL change alone — no client-side rewriting.
+ *
+ * <p>The body is parsed into a {@link PolarisLineageEvent} which Jackson 
resolves to one of {@code
+ * OfRunEvent} / {@code OfJobEvent} / {@code OfDatasetEvent} based on the 
{@code schemaURL} field.
+ * Unrecognized {@code schemaURL} values fall back to {@code RunEvent}, 
matching Marquez behavior.
+ *
+ * <p>This resource is hand-written rather than generated from the OpenLineage 
JSON Schema because
+ * the OpenAPI generator's Java template does not faithfully translate the 
spec's {@code oneOf}
+ * over event variants.
+ */
+@Path("/api/v1/lineage")
+public class PolarisOpenLineageApi {
+
+  private final PolarisOpenLineageApiService service;
+
+  @Inject
+  public PolarisOpenLineageApi(PolarisOpenLineageApiService service) {
+    this.service = service;
+  }
+
+  @POST
+  @Consumes("application/json")
+  @RolesAllowed("**")
+  @Timed("polaris.OpenLineageApi.sendLineageEvent")
+  @Timeout
+  public Response sendLineageEvent(
+      @NotNull @Valid PolarisLineageEvent event,

Review Comment:
   With the `OpenLineageIngestProvider` seam, `PolarisLineageEvent` stays 
inside the resource + adapter and never crosses the provider boundary. 
Follow-up implementations only see `OpenLineageIngestRequest`, which Polaris 
controls and can evolve independently from the JAX-RS binding or the 
OpenLineage-Java model.



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