/*
* 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.accumulo.server.util;
import java.io.IOException;
import java.net.UnknownHostException;
import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.util.UtilWaitThread;
import org.apache.accumulo.server.ServerConstants;
import org.apache.accumulo.server.fs.VolumeManager;
import org.apache.accumulo.server.fs.VolumeManagerImpl;
import org.apache.hadoop.fs.FileSystem;
import org.apache.accumulo.server.tablets.UniqueNameAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.log4j.Logger;
public class TabletOperations {
private static final Logger log = Logger.getLogger(TabletOperations.class);
public static String createTabletDirectory(VolumeManager fs, String tableId, Text endRow) {
String lowDirectory;
UniqueNameAllocator namer = UniqueNameAllocator.getInstance();
String volume = fs.choose(ServerConstants.getTablesDirs());
while (true) {
try {
if (endRow == null) {
lowDirectory = Constants.DEFAULT_TABLET_LOCATION;
Path lowDirectoryPath = new Path(volume + "/" + tableId + "/" + lowDirectory);
if (fs.exists(lowDirectoryPath) || fs.mkdirs(lowDirectoryPath)) {
FileSystem pathFs = fs.getVolumeByPath(lowDirectoryPath).getFileSystem();
return lowDirectoryPath.makeQualified(pathFs.getUri(), pathFs.getWorkingDirectory()).toString();
}
log.warn("Failed to create " + lowDirectoryPath + " for unknown reason");
} else {
lowDirectory = "/" + Constants.GENERATED_TABLET_DIRECTORY_PREFIX + namer.getNextName();
Path lowDirectoryPath = new Path(volume + "/" + tableId + "/" + lowDirectory);
if (fs.exists(lowDirectoryPath))
throw new IllegalStateException("Dir exist when it should not " + lowDirectoryPath);
if (fs.mkdirs(lowDirectoryPath)) {
FileSystem lowDirectoryFs = fs.getVolumeByPath(lowDirectoryPath).getFileSystem();
return lowDirectoryPath.makeQualified(lowDirectoryFs.getUri(), lowDirectoryFs.getWorkingDirectory()).toString();
}
}
} catch (IOException e) {
log.warn(e);
}
log.warn("Failed to create dir for tablet in table " + tableId + " in volume " + volume + " + will retry ...");
UtilWaitThread.sleep(3000);
}
}
public static String createTabletDirectory(String tableDir, Text endRow) {
while (true) {
try {
VolumeManager fs = VolumeManagerImpl.get();
return createTabletDirectory(fs, tableDir, endRow);
} catch (IOException e) {
log.warn("problem creating tablet directory", e);
} catch (IllegalArgumentException exception) {
/* thrown in some edge cases of DNS failure by Hadoop instead of UnknownHostException */
if (exception.getCause() instanceof UnknownHostException) {
log.warn("problem creating tablet directory", exception);
} else {
throw exception;
}
}
UtilWaitThread.sleep(3000);
}
}
}