flink-filesystems/flink-hadoop-fs/src/test/java/org/apache/flink/runtime/fs/hdfs/LimitedConnectionsConfigurationTest.java

/*
 * 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.flink.runtime.fs.hdfs;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.core.fs.LimitedConnectionsFileSystem;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.net.URI;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

/**
 * Test that the Hadoop file system wrapper correctly picks up connection limiting
 * settings for the correct file systems.
 */
public class LimitedConnectionsConfigurationTest {

	@Rule
	public final TemporaryFolder tempDir = new TemporaryFolder();

	@Test
	public void testConfiguration() throws Exception {

		// nothing configured, we should get a regular file system
		FileSystem hdfs = FileSystem.get(URI.create("hdfs://localhost:12345/a/b/c"));
		FileSystem ftpfs = FileSystem.get(URI.create("ftp://localhost:12345/a/b/c"));

		assertFalse(hdfs instanceof LimitedConnectionsFileSystem);
		assertFalse(ftpfs instanceof LimitedConnectionsFileSystem);

		// configure some limits, which should cause "fsScheme" to be limited

		final Configuration config = new Configuration();
		config.setInteger("fs.hdfs.limit.total", 40);
		config.setInteger("fs.hdfs.limit.input", 39);
		config.setInteger("fs.hdfs.limit.output", 38);
		config.setInteger("fs.hdfs.limit.timeout", 23456);
		config.setInteger("fs.hdfs.limit.stream-timeout", 34567);

		try {
			FileSystem.initialize(config);

			hdfs = FileSystem.get(URI.create("hdfs://localhost:12345/a/b/c"));
			ftpfs = FileSystem.get(URI.create("ftp://localhost:12345/a/b/c"));

			assertTrue(hdfs instanceof LimitedConnectionsFileSystem);
			assertFalse(ftpfs instanceof LimitedConnectionsFileSystem);

			LimitedConnectionsFileSystem limitedFs = (LimitedConnectionsFileSystem) hdfs;
			assertEquals(40, limitedFs.getMaxNumOpenStreamsTotal());
			assertEquals(39, limitedFs.getMaxNumOpenInputStreams());
			assertEquals(38, limitedFs.getMaxNumOpenOutputStreams());
			assertEquals(23456, limitedFs.getStreamOpenTimeout());
			assertEquals(34567, limitedFs.getStreamInactivityTimeout());
		}
		finally {
			// clear all settings
			FileSystem.initialize(new Configuration());
		}
	}
}