Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11293#discussion_r53585835
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveCatalog.scala ---
@@ -0,0 +1,293 @@
+/*
+ * 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.hive
+
+import scala.util.control.NonFatal
+
+import org.apache.hadoop.hive.ql.metadata.HiveException
+import org.apache.thrift.TException
+
+import org.apache.spark.Logging
+import org.apache.spark.sql.AnalysisException
+import org.apache.spark.sql.catalyst.analysis.NoSuchItemException
+import org.apache.spark.sql.catalyst.catalog._
+import org.apache.spark.sql.hive.client.HiveClient
+
+
+/**
+ * A persistent implementation of the system catalog using Hive.
+ * All public methods must be synchronized for thread-safety.
+ */
+private[spark] class HiveCatalog(client: HiveClient) extends Catalog with
Logging {
+ import Catalog._
+
+ // Exceptions thrown by the hive client that we would like to wrap
+ private val clientExceptions = Set(
+ classOf[HiveException].getCanonicalName,
+ classOf[TException].getCanonicalName)
+
+ /**
+ * Whether this is an exception thrown by the hive client that should be
wrapped.
+ *
+ * Due to classloader isolation issues, pattern matching won't work here
so we need
+ * to compare the canonical names of the exceptions, which we assume to
be stable.
+ */
+ private def isClientException(e: Throwable): Boolean = {
+ var temp: Class[_] = e.getClass
+ var found = false
+ while (temp != null && !found) {
+ found = clientExceptions.contains(temp.getCanonicalName)
+ temp = temp.getSuperclass
+ }
+ found
+ }
+
+ /**
+ * Run some code involving `client` in a [[synchronized]] block and wrap
certain
+ * exceptions thrown in the process in [[AnalysisException]].
+ */
+ private def withClient[T](body: => T): T = synchronized {
--- End diff --
cc @andrewor14 why does this one need to be synchronized?
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