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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.util.Collections;
import java.util.List;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.service.StorageService;
public class DiskBoundaries
{
public final List directories;
public final ImmutableList positions;
final long ringVersion;
final int directoriesVersion;
private final ColumnFamilyStore cfs;
private volatile boolean isInvalid = false;
public DiskBoundaries(ColumnFamilyStore cfs, Directories.DataDirectory[] directories, int diskVersion)
{
this(cfs, directories, null, -1, diskVersion);
}
@VisibleForTesting
public DiskBoundaries(ColumnFamilyStore cfs, Directories.DataDirectory[] directories, List positions, long ringVersion, int diskVersion)
{
this.directories = directories == null ? null : ImmutableList.copyOf(directories);
this.positions = positions == null ? null : ImmutableList.copyOf(positions);
this.ringVersion = ringVersion;
this.directoriesVersion = diskVersion;
this.cfs = cfs;
}
public boolean equals(Object o)
{
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
DiskBoundaries that = (DiskBoundaries) o;
if (ringVersion != that.ringVersion) return false;
if (directoriesVersion != that.directoriesVersion) return false;
if (!directories.equals(that.directories)) return false;
return positions != null ? positions.equals(that.positions) : that.positions == null;
}
public int hashCode()
{
int result = directories != null ? directories.hashCode() : 0;
result = 31 * result + (positions != null ? positions.hashCode() : 0);
result = 31 * result + (int) (ringVersion ^ (ringVersion >>> 32));
result = 31 * result + directoriesVersion;
return result;
}
public String toString()
{
return "DiskBoundaries{" +
"directories=" + directories +
", positions=" + positions +
", ringVersion=" + ringVersion +
", directoriesVersion=" + directoriesVersion +
'}';
}
/**
* check if the given disk boundaries are out of date due not being set or to having too old diskVersion/ringVersion
*/
public boolean isOutOfDate()
{
if (isInvalid)
return true;
int currentDiskVersion = DisallowedDirectories.getDirectoriesVersion();
long currentRingVersion = StorageService.instance.getTokenMetadata().getRingVersion();
return currentDiskVersion != directoriesVersion || (ringVersion != -1 && currentRingVersion != ringVersion);
}
public void invalidate()
{
this.isInvalid = true;
}
public int getDiskIndex(SSTableReader sstable)
{
if (positions == null)
{
return getBoundariesFromSSTableDirectory(sstable);
}
int pos = Collections.binarySearch(positions, sstable.first);
assert pos < 0; // boundaries are .minkeybound and .maxkeybound so they should never be equal
return -pos - 1;
}
/**
* Try to figure out location based on sstable directory
*/
private int getBoundariesFromSSTableDirectory(SSTableReader sstable)
{
Directories.DataDirectory actualDirectory = cfs.getDirectories().getDataDirectoryForFile(sstable.descriptor);
for (int i = 0; i < directories.size(); i++)
{
Directories.DataDirectory directory = directories.get(i);
if (actualDirectory != null && actualDirectory.equals(directory))
return i;
}
return 0;
}
public Directories.DataDirectory getCorrectDiskForSSTable(SSTableReader sstable)
{
return directories.get(getDiskIndex(sstable));
}
}