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/**
* 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.hadoop.hbase.client;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.util.JVMClusterUtil.RegionServerThread;
/**
* Base class to test Configuration Update logic. It wraps up things needed to
* test configuration change and provides utility methods for test cluster setup,
* updating/restoring configuration file.
*/
public abstract class AbstractTestUpdateConfiguration {
private static final String SERVER_CONFIG = "hbase-site.xml";
private static final String OVERRIDE_SERVER_CONFIG = "override-hbase-site.xml";
private static final String BACKUP_SERVER_CONFIG = "backup-hbase-site.xml";
private static Path configFileUnderTestDataDir;
private static Path overrideConfigFileUnderTestDataDir;
private static Path backupConfigFileUnderTestDataDir;
protected static void setUpConfigurationFiles(final HBaseTestingUtility testUtil)
throws Exception {
// Before this change, the test will update hbase-site.xml under target/test-classes and
// trigger a config reload. Since target/test-classes/hbase-site.xml is being used by
// other testing cases at the same time, this update will break other testing cases so it will
// be flakey in nature.
// To avoid this, the change is to make target/test-classes/hbase-site.xml immutable. A new
// hbase-site.xml will be created under its test data directory, i.e,
// hbase-server/target/test-data/UUID, this new file will be added as a resource for the
// config, new update will be applied to this new file and only visible to this specific test
// case. The target/test-classes/hbase-site.xml will not be changed during the test.
String absoluteDataPath = testUtil.getDataTestDir().toString();
// Create test-data directories.
Files.createDirectories(Paths.get(absoluteDataPath));
// Copy hbase-site.xml from target/test-class to target/test-data/UUID directory.
Path configFile = Paths.get("target", "test-classes", SERVER_CONFIG);
configFileUnderTestDataDir = Paths.get(absoluteDataPath, SERVER_CONFIG);
Files.copy(configFile, configFileUnderTestDataDir);
// Copy override config file overrider-hbase-site.xml from target/test-class to
// target/test-data/UUID directory.
Path overrideConfigFile = Paths.get("target", "test-classes",
OVERRIDE_SERVER_CONFIG);
overrideConfigFileUnderTestDataDir = Paths.get(absoluteDataPath, OVERRIDE_SERVER_CONFIG);
Files.copy(overrideConfigFile, overrideConfigFileUnderTestDataDir);
backupConfigFileUnderTestDataDir = Paths.get(absoluteDataPath, BACKUP_SERVER_CONFIG);
// Add the new custom config file to Configuration
testUtil.getConfiguration().addResource(testUtil.getDataTestDir(SERVER_CONFIG));
}
protected static void addResourceToRegionServerConfiguration(final HBaseTestingUtility testUtil) {
// When RegionServer is created in MiniHBaseCluster, it uses HBaseConfiguration.create(conf) of
// the master Configuration. The create() just copies config params over, it does not do
// a clone for a historic reason. Properties such as resources are lost during this process.
// Exposing a new method in HBaseConfiguration causes confusion. Instead, the new hbase-site.xml
// under test-data directory is added to RegionServer's configuration as a workaround.
for (RegionServerThread rsThread : testUtil.getMiniHBaseCluster().getRegionServerThreads()) {
rsThread.getRegionServer().getConfiguration().addResource(
testUtil.getDataTestDir(SERVER_CONFIG));
}
}
/**
* Replace the hbase-site.xml file under this test's data directory with the content of the
* override-hbase-site.xml file. Stashes the current existing file so that it can be restored
* using {@link #restoreHBaseSiteXML()}.
*
* @throws IOException if an I/O error occurs
*/
protected void replaceHBaseSiteXML() throws IOException {
// make a backup of hbase-site.xml
Files.copy(configFileUnderTestDataDir,
backupConfigFileUnderTestDataDir, StandardCopyOption.REPLACE_EXISTING);
// update hbase-site.xml by overwriting it
Files.copy(overrideConfigFileUnderTestDataDir,
configFileUnderTestDataDir, StandardCopyOption.REPLACE_EXISTING);
}
/**
* Restores the hbase-site.xml file that was stashed by a previous call to
* {@link #replaceHBaseSiteXML()}.
*
* @throws IOException if an I/O error occurs
*/
protected void restoreHBaseSiteXML() throws IOException {
// restore hbase-site.xml
Files.copy(backupConfigFileUnderTestDataDir,
configFileUnderTestDataDir, StandardCopyOption.REPLACE_EXISTING);
}
}