[FLINK-16917][orc] Workaround for classloader leak in OrcFile.

See https://issues.apache.org/jira/browse/ORC-653
OrcFile#getStaticMemoryManager caches initial configuration and leaks classloader in it. Thus, new Flink jobs use the classloader of the first job implicitly.

By adding ThreadLocalClassLoaderConfiguration, which forces the use of thread-local classloader over the initial classloader, Flink jobs use the appropriate classloader on higher runtime costs (no caches).
This commit should be reverted, once the bug in ORC is fixed.

flink-connectors/flink-connector-hive/src/main/java/org/apache/flink/connectors/hive/HiveTableSink.java

@@ -25,6 +25,7 @@
 import org.apache.flink.connectors.hive.write.HiveWriterFactory;
 import org.apache.flink.formats.parquet.row.ParquetRowDataBuilder;
 import org.apache.flink.orc.OrcSplitReaderUtil;
+import org.apache.flink.orc.writer.ThreadLocalClassLoaderConfiguration;
 import org.apache.flink.streaming.api.datastream.DataStream;
 import org.apache.flink.streaming.api.datastream.DataStreamSink;
 import org.apache.flink.streaming.api.functions.sink.filesystem.HadoopPathBasedBulkFormatBuilder;
@@ -255,12 +256,14 @@ private Optional<BulkWriter.Factory<RowData>> createBulkWriterFactory(String[] p
  formatTypes[i] = tableSchema.getFieldDataType(i).get().getLogicalType();
  }
  RowType formatType = RowType.of(formatTypes, formatNames);
- Configuration formatConf = new Configuration(jobConf);
- sd.getSerdeInfo().getParameters().forEach(formatConf::set);
  if (serLib.contains("parquet")) {
+ Configuration formatConf = new Configuration(jobConf);
+ sd.getSerdeInfo().getParameters().forEach(formatConf::set);
  return Optional.of(ParquetRowDataBuilder.createWriterFactory(
  formatType, formatConf, hiveVersion.startsWith("3.")));
  } else if (serLib.contains("orc")) {
+ Configuration formatConf = new ThreadLocalClassLoaderConfiguration(jobConf);
+ sd.getSerdeInfo().getParameters().forEach(formatConf::set);
  TypeDescription typeDescription = OrcSplitReaderUtil.logicalTypeToOrcType(formatType);
  return Optional.of(hiveShim.createOrcBulkWriterFactory(
  formatConf, typeDescription.toString(), formatTypes));

flink-formats/flink-orc/src/main/java/org/apache/flink/orc/writer/OrcBulkWriterFactory.java

@@ -111,7 +111,7 @@ public BulkWriter<T> create(FSDataOutputStream out) throws IOException {
 
  private OrcFile.WriterOptions getWriterOptions() {
  if (null == writerOptions) {
- Configuration conf = new Configuration();
+ Configuration conf = new ThreadLocalClassLoaderConfiguration();
  for (Map.Entry<String, String> entry : confMap.entrySet()) {
  conf.set(entry.getKey(), entry.getValue());
  }

flink-formats/flink-orc/src/main/java/org/apache/flink/orc/writer/ThreadLocalClassLoaderConfiguration.java

@@ -0,0 +1,59 @@
+/*
+ * 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
+ *
+ * https://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.flink.orc.writer;
+
+import org.apache.flink.annotation.Internal;
+
+import org.apache.hadoop.conf.Configuration;
+
+import java.net.URL;
+
+/**
+ * Workaround for https://issues.apache.org/jira/browse/ORC-653.
+ *
+ * <p>Since the conf is effectively cached across Flink jobs, at least force the thread local classloader to avoid
+ * classloader leaks.
+ */
+@Internal
+public final class ThreadLocalClassLoaderConfiguration extends Configuration {
+ public ThreadLocalClassLoaderConfiguration() {
+ }
+
+ public ThreadLocalClassLoaderConfiguration(Configuration other) {
+ super(other);
+ }
+
+ @Override
+ public ClassLoader getClassLoader() {
+ return Thread.currentThread().getContextClassLoader();
+ }
+
+ @Override
+ public Class<?> getClassByNameOrNull(String name) {
+ try {
+ return Class.forName(name, true, getClassLoader());
+ } catch (ClassNotFoundException e) {
+ return null;
+ }
+ }
+
+ @Override
+ public URL getResource(String name) {
+ return getClassLoader().getResource(name);
+ }
+}