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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.io.sstable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import org.apache.cassandra.db.Directories;
import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
import org.apache.cassandra.db.streaming.CassandraOutgoingFile;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.io.FSError;
import org.apache.cassandra.io.sstable.format.SSTableFormat.Components;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.io.util.File;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.schema.TableMetadataRef;
import org.apache.cassandra.streaming.OutgoingStream;
import org.apache.cassandra.streaming.PreviewKind;
import org.apache.cassandra.streaming.StreamEvent;
import org.apache.cassandra.streaming.StreamEventHandler;
import org.apache.cassandra.streaming.StreamOperation;
import org.apache.cassandra.streaming.StreamPlan;
import org.apache.cassandra.streaming.StreamResultFuture;
import org.apache.cassandra.streaming.StreamState;
import org.apache.cassandra.streaming.StreamingChannel;
import org.apache.cassandra.utils.OutputHandler;
import org.apache.cassandra.utils.Pair;
import org.apache.cassandra.utils.concurrent.Ref;
import static org.apache.cassandra.streaming.StreamingChannel.Factory.Global.streamingFactory;
/**
* Cassandra SSTable bulk loader.
* Load an externally created sstable into a cluster.
*/
public class SSTableLoader implements StreamEventHandler
{
private final File directory;
private final String keyspace;
private final String table;
private final Client client;
private final int connectionsPerHost;
private final OutputHandler outputHandler;
private final Set failedHosts = new HashSet<>();
private final List sstables = new ArrayList<>();
public SSTableLoader(File directory, Client client, OutputHandler outputHandler)
{
this(directory, client, outputHandler, 1, null);
}
public SSTableLoader(File directory, Client client, OutputHandler outputHandler, int connectionsPerHost, String targetKeyspace)
{
this(directory, client, outputHandler, connectionsPerHost, targetKeyspace, null);
}
public SSTableLoader(File directory, Client client, OutputHandler outputHandler, int connectionsPerHost, String targetKeyspace, String targetTable)
{
this.directory = directory;
this.keyspace = targetKeyspace != null ? targetKeyspace : directory.parent().name();
this.table = targetTable;
this.client = client;
this.outputHandler = outputHandler;
this.connectionsPerHost = connectionsPerHost;
}
@SuppressWarnings("resource")
private Multimap openSSTables(final Map>> ranges)
{
outputHandler.output("Opening sstables and calculating sections to stream");
Multimap streamingDetails = HashMultimap.create();
LifecycleTransaction.getFiles(directory.toPath(),
(file, type) ->
{
File dir = file.parent();
String name = file.name();
if (type != Directories.FileType.FINAL)
{
outputHandler.output(String.format("Skipping temporary file %s", name));
return false;
}
Pair p;
if (null != keyspace && null != table)
{
p = SSTable.tryComponentFromFilename(file, keyspace, table);
}
else
{
p = SSTable.tryComponentFromFilename(file);
}
Descriptor desc = p == null ? null : p.left;
if (p == null || !p.right.equals(Components.DATA))
return false;
for (Component c : desc.getFormat().primaryComponents())
{
if (!desc.fileFor(c).exists())
{
outputHandler.output(String.format("Skipping file %s because %s is missing", name, c.name));
return false;
}
}
TableMetadataRef metadata = client.getTableMetadata(desc.cfname);
if (metadata == null)
{
outputHandler.output(String.format("Skipping file %s: table %s.%s doesn't exist", name, keyspace, desc.cfname));
return false;
}
Set components = desc.getComponents(desc.getFormat().primaryComponents(), desc.getFormat().uploadComponents());
try
{
// To conserve memory, open SSTableReaders without bloom filters and discard
// the index summary after calculating the file sections to stream and the estimated
// number of keys for each endpoint. See CASSANDRA-5555 for details.
SSTableReader sstable = SSTableReader.openForBatch(null, desc, components, metadata);
sstables.add(sstable);
// calculate the sstable sections to stream as well as the estimated number of
// keys per host
for (Map.Entry>> entry : ranges.entrySet())
{
InetAddressAndPort endpoint = entry.getKey();
List> tokenRanges = Range.normalize(entry.getValue());
List sstableSections = sstable.getPositionsForRanges(tokenRanges);
// Do not stream to nodes that don't own any part of the SSTable, empty streams
// will generate an error on the server. See CASSANDRA-16349 for details.
if (sstableSections.isEmpty())
continue;
long estimatedKeys = sstable.estimatedKeysForRanges(tokenRanges);
Ref ref = sstable.ref();
CassandraOutgoingFile stream = new CassandraOutgoingFile(StreamOperation.BULK_LOAD, ref, sstableSections, tokenRanges, estimatedKeys);
streamingDetails.put(endpoint, stream);
}
// to conserve heap space when bulk loading
sstable.releaseInMemoryComponents();
}
catch (FSError e)
{
// todo: should we really continue if we can't open all sstables?
outputHandler.output(String.format("Skipping file %s, error opening it: %s", name, e.getMessage()));
}
return false;
},
Directories.OnTxnErr.IGNORE);
return streamingDetails;
}
public StreamResultFuture stream()
{
return stream(Collections.emptySet());
}
public StreamResultFuture stream(Set toIgnore, StreamEventHandler... listeners)
{
client.init(keyspace);
outputHandler.output("Established connection to initial hosts");
StreamPlan plan = new StreamPlan(StreamOperation.BULK_LOAD, connectionsPerHost, false, null, PreviewKind.NONE).connectionFactory(client.getConnectionFactory());
Map>> endpointToRanges = client.getEndpointToRangesMap();
Multimap streamingDetails = openSSTables(endpointToRanges);
if (streamingDetails.isEmpty())
{
// return empty result
return plan.execute();
}
outputHandler.output(String.format("Streaming relevant part of %s to %s", names(streamingDetails.values()), endpointToRanges.keySet()));
for (Map.Entry>> entry : endpointToRanges.entrySet())
{
InetAddressAndPort remote = entry.getKey();
if (toIgnore.contains(remote))
continue;
// references are acquired when constructing the SSTableStreamingSections above
List streams = new LinkedList<>(streamingDetails.get(remote));
plan.transferStreams(remote, streams);
}
plan.listeners(this, listeners);
return plan.execute();
}
public void onSuccess(StreamState finalState)
{
releaseReferences();
}
public void onFailure(Throwable t)
{
releaseReferences();
}
/**
* releases the shared reference for all sstables, we acquire this when opening the sstable
*/
private void releaseReferences()
{
Iterator it = sstables.iterator();
while (it.hasNext())
{
SSTableReader sstable = it.next();
sstable.selfRef().release();
assert sstable.selfRef().globalCount() == 0 : String.format("for sstable = %s, ref count = %d", sstable, sstable.selfRef().globalCount());
it.remove();
}
}
public void handleStreamEvent(StreamEvent event)
{
if (event.eventType == StreamEvent.Type.STREAM_COMPLETE)
{
StreamEvent.SessionCompleteEvent se = (StreamEvent.SessionCompleteEvent) event;
if (!se.success)
failedHosts.add(se.peer);
}
}
private String names(Collection sstables)
{
return sstables.stream().map(CassandraOutgoingFile::getName).distinct().collect(Collectors.joining(" "));
}
public Set getFailedHosts()
{
return failedHosts;
}
public static abstract class Client
{
private final Map>> endpointToRanges = new HashMap<>();
/**
* Initialize the client.
* Perform any step necessary so that after the call to the this
* method:
* * partitioner is initialized
* * getEndpointToRangesMap() returns a correct map
* This method is guaranteed to be called before any other method of a
* client.
*/
public abstract void init(String keyspace);
/**
* Stop the client.
*/
public void stop()
{
}
/**
* Provides connection factory.
* By default, it uses DefaultConnectionFactory.
*
* @return StreamConnectionFactory to use
*/
public StreamingChannel.Factory getConnectionFactory()
{
return streamingFactory();
}
/**
* Validate that {@code keyspace} is an existing keyspace and {@code
* cfName} one of its existing column family.
*/
public abstract TableMetadataRef getTableMetadata(String tableName);
public void setTableMetadata(TableMetadataRef cfm)
{
throw new RuntimeException();
}
public Map>> getEndpointToRangesMap()
{
return endpointToRanges;
}
protected void addRangeForEndpoint(Range range, InetAddressAndPort endpoint)
{
Collection> ranges = endpointToRanges.get(endpoint);
if (ranges == null)
{
ranges = new HashSet<>();
endpointToRanges.put(endpoint, ranges);
}
ranges.add(range);
}
}
}
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