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A fork of the Apache Cassandra Project ready to embed Elasticsearch.
/*
* 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.cassandra.db;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.Paths;
import com.google.common.annotations.VisibleForTesting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.io.util.FileUtils;
public class WindowsFailedSnapshotTracker
{
private static final Logger logger = LoggerFactory.getLogger(WindowsFailedSnapshotTracker.class);
private static PrintWriter _failedSnapshotFile;
@VisibleForTesting
// Need to handle null for unit tests
public static final String TODELETEFILE = System.getenv("CASSANDRA_HOME") == null
? ".toDelete"
: System.getenv("CASSANDRA_HOME") + File.separator + ".toDelete";
public static void deleteOldSnapshots()
{
if (new File(TODELETEFILE).exists())
{
try
{
try (BufferedReader reader = new BufferedReader(new FileReader(TODELETEFILE)))
{
String snapshotDirectory;
while ((snapshotDirectory = reader.readLine()) != null)
{
File f = new File(snapshotDirectory);
// Skip folders that aren't a subset of temp or a data folder. We don't want people to accidentally
// delete something important by virtue of adding something invalid to the .toDelete file.
boolean validFolder = FileUtils.isSubDirectory(new File(System.getenv("TEMP")), f);
for (String s : DatabaseDescriptor.getAllDataFileLocations())
validFolder |= FileUtils.isSubDirectory(new File(s), f);
if (!validFolder)
{
logger.warn("Skipping invalid directory found in .toDelete: {}. Only %TEMP% or data file subdirectories are valid.", f);
continue;
}
// Could be a non-existent directory if deletion worked on previous JVM shutdown.
if (f.exists())
{
logger.warn("Discovered obsolete snapshot. Deleting directory [{}]", snapshotDirectory);
FileUtils.deleteRecursive(new File(snapshotDirectory));
}
}
}
// Only delete the old .toDelete file if we succeed in deleting all our known bad snapshots.
Files.delete(Paths.get(TODELETEFILE));
}
catch (IOException e)
{
logger.warn("Failed to open {}. Obsolete snapshots from previous runs will not be deleted.", TODELETEFILE, e);
}
}
try
{
_failedSnapshotFile = new PrintWriter(new FileWriter(TODELETEFILE, true));
}
catch (IOException e)
{
throw new RuntimeException(String.format("Failed to create failed snapshot tracking file [%s]. Aborting", TODELETEFILE));
}
}
public static synchronized void handleFailedSnapshot(File dir)
{
assert _failedSnapshotFile != null : "_failedSnapshotFile not initialized within WindowsFailedSnapshotTracker";
FileUtils.deleteRecursiveOnExit(dir);
_failedSnapshotFile.println(dir.toString());
_failedSnapshotFile.flush();
}
@VisibleForTesting
public static void resetForTests()
{
_failedSnapshotFile.close();
}
}
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