[GitHub] [spark] grundprinzip commented on a diff in pull request #42377: [SPARK-44622][SQL][CONNECT] Implement FetchErrorDetails RPC

["grundprinzip (via GitHub)" <gi...@apache.org>]

grundprinzip commented on code in PR #42377:
URL: https://github.com/apache/spark/pull/42377#discussion_r1330278768


##########
connector/connect/server/src/main/scala/org/apache/spark/sql/connect/service/SparkConnectFetchErrorDetailsHandler.scala:
##########
@@ -0,0 +1,57 @@
+/*
+ * 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.spark.sql.connect.service
+
+import io.grpc.stub.StreamObserver
+
+import org.apache.spark.connect.proto
+import org.apache.spark.connect.proto.FetchErrorDetailsResponse
+import org.apache.spark.sql.connect.config.Connect
+import org.apache.spark.sql.connect.utils.ErrorUtils
+import org.apache.spark.sql.internal.SQLConf
+
+/**
+ * Handles [[proto.FetchErrorDetailsRequest]]s for the [[SparkConnectService]].
+ *
+ * @param responseObserver
+ */
+class SparkConnectFetchErrorDetailsHandler(
+    responseObserver: StreamObserver[proto.FetchErrorDetailsResponse]) {
+
+  def handle(v: proto.FetchErrorDetailsRequest): Unit = {
+    val sessionHolder =
+      SparkConnectService
+        .getOrCreateIsolatedSession(v.getUserContext.getUserId, v.getSessionId)
+
+    val response = Option(sessionHolder.errorIdToError.getIfPresent(v.getErrorId))
+      .map { error =>
+        sessionHolder.errorIdToError.invalidate(v.getErrorId)

Review Comment:
   It's good to put a comment here that this error can only be fetched once, if a connection dies in the middle you cannot repeat.



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