/**
* Copyright 2007 The Apache Software Foundation
*
* 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.util;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.dfs.DistributedFileSystem;
/**
* Utility methods for interacting with the underlying file system.
*/
public class FSUtils {
private static final Log LOG = LogFactory.getLog(FSUtils.class);
/**
* Not instantiable
*/
private FSUtils() {}
/**
* Checks to see if the specified file system is available
*
* @param fs
* @return true if the specified file system is available.
*/
public static boolean isFileSystemAvailable(final FileSystem fs) {
if (!(fs instanceof DistributedFileSystem)) {
return true;
}
String exception = "";
boolean available = false;
DistributedFileSystem dfs = (DistributedFileSystem) fs;
try {
if (dfs.exists(new Path("/"))) {
available = true;
}
} catch (IOException e) {
exception = e.getMessage();
}
try {
if (!available) {
LOG.info("Failed file system available test. Thread: " +
Thread.currentThread().getName() + ": " + exception);
fs.close();
}
} catch (Exception e) {
LOG.error("file system close failed: ", e);
}
return available;
}
}