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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.io.IOException;
import java.nio.ByteBuffer;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicLong;
import com.google.common.base.Throwables;
import com.google.common.util.concurrent.Uninterruptibles;
import org.apache.commons.lang3.StringUtils;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.partitions.PartitionUpdate;
import org.apache.cassandra.db.rows.SerializationHelper;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.net.MessageOut;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
// TODO convert this to a Builder pattern instead of encouraging M.add directly,
// which is less-efficient since we have to keep a mutable HashMap around
public class Mutation implements IMutation
{
public static final MutationSerializer serializer = new MutationSerializer();
private static final Logger logger = LoggerFactory.getLogger(Mutation.class);
public static final String FORWARD_TO = "FWD_TO";
public static final String FORWARD_FROM = "FWD_FRM";
// todo this is redundant
// when we remove it, also restore SerializationsTest.testMutationRead to not regenerate new Mutations each test
private final String keyspaceName;
private final DecoratedKey key;
// map of column family id to mutations for that column family.
private final Map modifications;
// Time at which this mutation was instantiated
public final long createdAt = System.currentTimeMillis();
// keep track of when mutation has started waiting for a MV partition lock
public final AtomicLong viewLockAcquireStart = new AtomicLong(0);
public Mutation(String keyspaceName, DecoratedKey key)
{
this(keyspaceName, key, new HashMap<>());
}
public Mutation(PartitionUpdate update)
{
this(update.metadata().ksName, update.partitionKey(), Collections.singletonMap(update.metadata().cfId, update));
}
protected Mutation(String keyspaceName, DecoratedKey key, Map modifications)
{
this.keyspaceName = keyspaceName;
this.key = key;
this.modifications = modifications;
}
public Mutation copy()
{
return new Mutation(keyspaceName, key, new HashMap<>(modifications));
}
public Mutation without(Set cfIds)
{
if (cfIds.isEmpty())
return this;
Mutation copy = copy();
copy.modifications.keySet().removeAll(cfIds);
return copy;
}
public Mutation without(UUID cfId)
{
return without(Collections.singleton(cfId));
}
public String getKeyspaceName()
{
return keyspaceName;
}
public Collection getColumnFamilyIds()
{
return modifications.keySet();
}
public DecoratedKey key()
{
return key;
}
public Collection getPartitionUpdates()
{
return modifications.values();
}
public PartitionUpdate getPartitionUpdate(UUID cfId)
{
return modifications.get(cfId);
}
public Mutation add(PartitionUpdate update)
{
assert update != null;
assert update.partitionKey().getPartitioner() == key.getPartitioner();
PartitionUpdate prev = modifications.put(update.metadata().cfId, update);
if (prev != null)
// developer error
throw new IllegalArgumentException("Table " + update.metadata().cfName + " already has modifications in this mutation: " + prev);
return this;
}
public PartitionUpdate get(CFMetaData cfm)
{
return modifications.get(cfm.cfId);
}
public boolean isEmpty()
{
return modifications.isEmpty();
}
/**
* Creates a new mutation that merges all the provided mutations.
*
* @param mutations the mutations to merge together. All mutation must be
* on the same keyspace and partition key. There should also be at least one
* mutation.
* @return a mutation that contains all the modifications contained in {@code mutations}.
*
* @throws IllegalArgumentException if not all the mutations are on the same
* keyspace and key.
*/
public static Mutation merge(List mutations)
{
assert !mutations.isEmpty();
if (mutations.size() == 1)
return mutations.get(0);
Set updatedTables = new HashSet<>();
String ks = null;
DecoratedKey key = null;
for (Mutation mutation : mutations)
{
updatedTables.addAll(mutation.modifications.keySet());
if (ks != null && !ks.equals(mutation.keyspaceName))
throw new IllegalArgumentException();
if (key != null && !key.equals(mutation.key))
throw new IllegalArgumentException();
ks = mutation.keyspaceName;
key = mutation.key;
}
List updates = new ArrayList<>(mutations.size());
Map modifications = new HashMap<>(updatedTables.size());
for (UUID table : updatedTables)
{
for (Mutation mutation : mutations)
{
PartitionUpdate upd = mutation.modifications.get(table);
if (upd != null)
updates.add(upd);
}
if (updates.isEmpty())
continue;
modifications.put(table, updates.size() == 1 ? updates.get(0) : PartitionUpdate.merge(updates));
updates.clear();
}
return new Mutation(ks, key, modifications);
}
public CompletableFuture applyFuture()
{
Keyspace ks = Keyspace.open(keyspaceName);
return ks.applyFuture(this, Keyspace.open(keyspaceName).getMetadata().params.durableWrites, true);
}
public void apply(boolean durableWrites, boolean isDroppable)
{
Keyspace.open(keyspaceName).apply(this, durableWrites, true, isDroppable);
}
public void apply(boolean durableWrites)
{
apply(durableWrites, true);
}
/*
* This is equivalent to calling commit. Applies the changes to
* to the keyspace that is obtained by calling Keyspace.open().
*/
public void apply()
{
apply(Keyspace.open(keyspaceName).getMetadata().params.durableWrites);
}
public void applyUnsafe()
{
apply(false);
}
public MessageOut createMessage()
{
return createMessage(MessagingService.Verb.MUTATION);
}
public MessageOut createMessage(MessagingService.Verb verb)
{
return new MessageOut<>(verb, this, serializer);
}
public long getTimeout()
{
return DatabaseDescriptor.getWriteRpcTimeout();
}
public int smallestGCGS()
{
int gcgs = Integer.MAX_VALUE;
for (PartitionUpdate update : getPartitionUpdates())
gcgs = Math.min(gcgs, update.metadata().params.gcGraceSeconds);
return gcgs;
}
public String toString()
{
return toString(false);
}
public String toString(boolean shallow)
{
StringBuilder buff = new StringBuilder("Mutation(");
buff.append("keyspace='").append(keyspaceName).append('\'');
buff.append(", key='").append(ByteBufferUtil.bytesToHex(key.getKey())).append('\'');
buff.append(", modifications=[");
if (shallow)
{
List cfnames = new ArrayList(modifications.size());
for (UUID cfid : modifications.keySet())
{
CFMetaData cfm = Schema.instance.getCFMetaData(cfid);
cfnames.add(cfm == null ? "-dropped-" : cfm.cfName);
}
buff.append(StringUtils.join(cfnames, ", "));
}
else
{
buff.append("\n ").append(StringUtils.join(modifications.values(), "\n ")).append("\n");
}
return buff.append("])").toString();
}
public static class MutationSerializer implements IVersionedSerializer
{
public void serialize(Mutation mutation, DataOutputPlus out, int version) throws IOException
{
if (version < MessagingService.VERSION_20)
out.writeUTF(mutation.getKeyspaceName());
/* serialize the modifications in the mutation */
int size = mutation.modifications.size();
if (version < MessagingService.VERSION_30)
{
ByteBufferUtil.writeWithShortLength(mutation.key().getKey(), out);
out.writeInt(size);
}
else
{
out.writeUnsignedVInt(size);
}
assert size > 0;
for (Map.Entry entry : mutation.modifications.entrySet())
PartitionUpdate.serializer.serialize(entry.getValue(), out, version);
}
public Mutation deserialize(DataInputPlus in, int version, SerializationHelper.Flag flag) throws IOException
{
if (version < MessagingService.VERSION_20)
in.readUTF(); // read pre-2.0 keyspace name
ByteBuffer key = null;
int size;
if (version < MessagingService.VERSION_30)
{
key = ByteBufferUtil.readWithShortLength(in);
size = in.readInt();
}
else
{
size = (int)in.readUnsignedVInt();
}
assert size > 0;
PartitionUpdate update = PartitionUpdate.serializer.deserialize(in, version, flag, key);
if (size == 1)
return new Mutation(update);
Map modifications = new HashMap<>(size);
DecoratedKey dk = update.partitionKey();
modifications.put(update.metadata().cfId, update);
for (int i = 1; i < size; ++i)
{
update = PartitionUpdate.serializer.deserialize(in, version, flag, dk);
modifications.put(update.metadata().cfId, update);
}
return new Mutation(update.metadata().ksName, dk, modifications);
}
public Mutation deserialize(DataInputPlus in, int version) throws IOException
{
return deserialize(in, version, SerializationHelper.Flag.FROM_REMOTE);
}
public long serializedSize(Mutation mutation, int version)
{
int size = 0;
if (version < MessagingService.VERSION_20)
size += TypeSizes.sizeof(mutation.getKeyspaceName());
if (version < MessagingService.VERSION_30)
{
int keySize = mutation.key().getKey().remaining();
size += TypeSizes.sizeof((short) keySize) + keySize;
size += TypeSizes.sizeof(mutation.modifications.size());
}
else
{
size += TypeSizes.sizeofUnsignedVInt(mutation.modifications.size());
}
for (Map.Entry entry : mutation.modifications.entrySet())
size += PartitionUpdate.serializer.serializedSize(entry.getValue(), version);
return size;
}
}
}
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