src/java/org/apache/cassandra/cql3/statements/BatchStatement.java - cassandra - Git at Google

 /*
  * 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.cql3.statements;

 import java.nio.ByteBuffer;
 import java.util.*;
 import java.util.concurrent.TimeUnit;

 import com.google.common.base.Function;
 import com.google.common.collect.Iterables;

 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.slf4j.helpers.MessageFormatter;

 import org.apache.cassandra.config.ColumnDefinition;
 import org.apache.cassandra.config.DatabaseDescriptor;
 import org.apache.cassandra.cql3.*;
 import org.apache.cassandra.db.*;
 import org.apache.cassandra.db.composites.Composite;
 import org.apache.cassandra.exceptions.*;
 import org.apache.cassandra.service.ClientState;
 import org.apache.cassandra.service.ClientWarn;
 import org.apache.cassandra.service.QueryState;
 import org.apache.cassandra.service.StorageProxy;
 import org.apache.cassandra.tracing.Tracing;
 import org.apache.cassandra.transport.messages.ResultMessage;
 import org.apache.cassandra.utils.NoSpamLogger;
 import org.apache.cassandra.utils.Pair;

 /**
  * A <code>BATCH</code> statement parsed from a CQL query.
  */
 public class BatchStatement implements CQLStatement
 {
     public enum Type
     {
         LOGGED, UNLOGGED, COUNTER
     }

     private final int boundTerms;
     public final Type type;
     private final List<ModificationStatement> statements;
     private final Attributes attrs;
     private final boolean hasConditions;
     private static final Logger logger = LoggerFactory.getLogger(BatchStatement.class);
     private static final String unloggedBatchWarning = "Unlogged batch covering {} partitions detected against table{} {}. " +
                                                        "You should use a logged batch for atomicity, or asynchronous writes for performance.";

     /**
      * Creates a new BatchStatement from a list of statements and a
      * Thrift consistency level.
      *
      * @param type       type of the batch
      * @param statements a list of UpdateStatements
      * @param attrs      additional attributes for statement (CL, timestamp, timeToLive)
      */
     public BatchStatement(int boundTerms, Type type, List<ModificationStatement> statements, Attributes attrs)
     {
         boolean hasConditions = false;
         for (ModificationStatement statement : statements)
             hasConditions |= statement.hasConditions();

         this.boundTerms = boundTerms;
         this.type = type;
         this.statements = statements;
         this.attrs = attrs;
         this.hasConditions = hasConditions;
     }

     public Iterable<org.apache.cassandra.cql3.functions.Function> getFunctions()
     {
         Iterable<org.apache.cassandra.cql3.functions.Function> functions = attrs.getFunctions();
         for (ModificationStatement statement : statements)
             functions = Iterables.concat(functions, statement.getFunctions());
         return functions;
     }

     public int getBoundTerms()
     {
         return boundTerms;
     }

     public void checkAccess(ClientState state) throws InvalidRequestException, UnauthorizedException
     {
         for (ModificationStatement statement : statements)
             statement.checkAccess(state);
     }

     // Validates a prepared batch statement without validating its nested statements.
     public void validate() throws InvalidRequestException
     {
         if (attrs.isTimeToLiveSet())
             throw new InvalidRequestException("Global TTL on the BATCH statement is not supported.");

         boolean timestampSet = attrs.isTimestampSet();
         if (timestampSet)
         {
             if (hasConditions)
                 throw new InvalidRequestException("Cannot provide custom timestamp for conditional BATCH");
             if (type == Type.COUNTER)
                 throw new InvalidRequestException("Cannot provide custom timestamp for counter BATCH");
         }

         boolean hasCounters = false;
         boolean hasNonCounters = false;

         for (ModificationStatement statement : statements)
         {
             if (timestampSet && statement.isCounter())
                 throw new InvalidRequestException("Cannot provide custom timestamp for a BATCH containing counters");

             if (timestampSet && statement.isTimestampSet())
                 throw new InvalidRequestException("Timestamp must be set either on BATCH or individual statements");

             if (type == Type.COUNTER && !statement.isCounter())
                 throw new InvalidRequestException("Cannot include non-counter statement in a counter batch");

             if (type == Type.LOGGED && statement.isCounter())
                 throw new InvalidRequestException("Cannot include a counter statement in a logged batch");

             if (statement.isCounter())
                 hasCounters = true;
             else
                 hasNonCounters = true;
         }

         if (hasCounters && hasNonCounters)
             throw new InvalidRequestException("Counter and non-counter mutations cannot exist in the same batch");

         if (hasConditions)
         {
             String ksName = null;
             String cfName = null;
             for (ModificationStatement stmt : statements)
             {
                 if (ksName != null && (!stmt.keyspace().equals(ksName) || !stmt.columnFamily().equals(cfName)))
                     throw new InvalidRequestException("Batch with conditions cannot span multiple tables");
                 ksName = stmt.keyspace();
                 cfName = stmt.columnFamily();
             }
         }
     }

     // The batch itself will be validated in either Parsed#prepare() - for regular CQL3 batches,
     //   or in QueryProcessor.processBatch() - for native protocol batches.
     public void validate(ClientState state) throws InvalidRequestException
     {
         for (ModificationStatement statement : statements)
             statement.validate(state);
     }

     public List<ModificationStatement> getStatements()
     {
         return statements;
     }

     private Collection<? extends IMutation> getMutations(BatchQueryOptions options, boolean local, long now)
     throws RequestExecutionException, RequestValidationException
     {
         Map<String, Map<ByteBuffer, IMutation>> mutations = new HashMap<>();
         for (int i = 0; i < statements.size(); i++)
         {
             ModificationStatement statement = statements.get(i);
             QueryOptions statementOptions = options.forStatement(i);
             long timestamp = attrs.getTimestamp(now, statementOptions);
             addStatementMutations(statement, statementOptions, local, timestamp, mutations);
         }
         return unzipMutations(mutations);
     }

     private Collection<? extends IMutation> unzipMutations(Map<String, Map<ByteBuffer, IMutation>> mutations)
     {

         // The case where all statement where on the same keyspace is pretty common
         if (mutations.size() == 1)
             return mutations.values().iterator().next().values();


         List<IMutation> ms = new ArrayList<>();
         for (Map<ByteBuffer, IMutation> ksMap : mutations.values())
             ms.addAll(ksMap.values());

         return ms;
     }

     private void addStatementMutations(ModificationStatement statement,
                                        QueryOptions options,
                                        boolean local,
                                        long now,
                                        Map<String, Map<ByteBuffer, IMutation>> mutations)
     throws RequestExecutionException, RequestValidationException
     {
         String ksName = statement.keyspace();
         Map<ByteBuffer, IMutation> ksMap = mutations.get(ksName);
         if (ksMap == null)
         {
             ksMap = new HashMap<>();
             mutations.put(ksName, ksMap);
         }

         // The following does the same than statement.getMutations(), but we inline it here because
         // we don't want to recreate mutations every time as this is particularly inefficient when applying
         // multiple batch to the same partition (see #6737).
         List<ByteBuffer> keys = statement.buildPartitionKeyNames(options);
         Composite clusteringPrefix = statement.createClusteringPrefix(options);
         UpdateParameters params = statement.makeUpdateParameters(keys, clusteringPrefix, options, local, now);

         for (ByteBuffer key : keys)
         {
             IMutation mutation = ksMap.get(key);
             Mutation mut;
             if (mutation == null)
             {
                 mut = new Mutation(ksName, key);
                 mutation = statement.cfm.isCounter() ? new CounterMutation(mut, options.getConsistency()) : mut;
                 ksMap.put(key, mutation);
             }
             else
             {
                 mut = statement.cfm.isCounter() ? ((CounterMutation) mutation).getMutation() : (Mutation) mutation;
             }

             statement.addUpdateForKey(mut.addOrGet(statement.cfm), key, clusteringPrefix, params);
         }
     }

     /**
      * Checks batch size to ensure threshold is met. If not, a warning is logged.
      *
      * @param cfs ColumnFamilies that will store the batch's mutations.
      */
     public static void verifyBatchSize(Iterable<ColumnFamily> cfs) throws InvalidRequestException
     {
         long size = 0;
         long warnThreshold = DatabaseDescriptor.getBatchSizeWarnThreshold();
         long failThreshold = DatabaseDescriptor.getBatchSizeFailThreshold();

         for (ColumnFamily cf : cfs)
             size += cf.dataSize();

         if (size > warnThreshold)
         {
             Set<String> ksCfPairs = new HashSet<>();
             for (ColumnFamily cf : cfs)
                 ksCfPairs.add(String.format("%s.%s", cf.metadata().ksName, cf.metadata().cfName));

             String format = "Batch of prepared statements for {} is of size {}, exceeding specified threshold of {} by {}.{}";
             if (size > failThreshold)
             {
                 Tracing.trace(format, ksCfPairs, size, failThreshold, size - failThreshold, " (see batch_size_fail_threshold_in_kb)");
                 logger.error(format, ksCfPairs, size, failThreshold, size - failThreshold, " (see batch_size_fail_threshold_in_kb)");
                 throw new InvalidRequestException("Batch too large");
             }
             else if (logger.isWarnEnabled())
             {
                 logger.warn(format, ksCfPairs, size, warnThreshold, size - warnThreshold, "");
             }
             ClientWarn.instance.warn(MessageFormatter.arrayFormat(format, new Object[]{ ksCfPairs, size, warnThreshold, size - warnThreshold, "" }).getMessage());
         }
     }

     private void verifyBatchType(Collection<? extends IMutation> mutations)
     {
         if (type != Type.LOGGED && mutations.size() > 1)
         {
             Set<String> ksCfPairs = new HashSet<>();
             Set<ByteBuffer> keySet = new HashSet<>();

             for (IMutation im : mutations)
             {
                 keySet.add(im.key());

                 for (ColumnFamily cf : im.getColumnFamilies())
                     ksCfPairs.add(String.format("%s.%s", cf.metadata().ksName, cf.metadata().cfName));
             }

             // CASSANDRA-11529: log only if we have more than a threshold of keys, this was also suggested in the
             // original ticket that introduced this warning, CASSANDRA-9282
             if (keySet.size() > DatabaseDescriptor.getUnloggedBatchAcrossPartitionsWarnThreshold())
             {
                 NoSpamLogger.log(logger, NoSpamLogger.Level.WARN, 1, TimeUnit.MINUTES, unloggedBatchWarning,
                                  keySet.size(), ksCfPairs.size() == 1 ? "" : "s", ksCfPairs);

                 ClientWarn.instance.warn(MessageFormatter.arrayFormat(unloggedBatchWarning,
                                                                   new Object[]{
                                                                               keySet.size(),
                                                                               ksCfPairs.size() == 1 ? "" : "s",
                                                                               ksCfPairs
                                                                   }).getMessage());
             }
         }
     }


     public ResultMessage execute(QueryState queryState, QueryOptions options) throws RequestExecutionException, RequestValidationException
     {
         return execute(queryState, BatchQueryOptions.withoutPerStatementVariables(options));
     }

     public ResultMessage execute(QueryState queryState, BatchQueryOptions options) throws RequestExecutionException, RequestValidationException
     {
         return execute(queryState, options, false, options.getTimestamp(queryState));
     }

     private ResultMessage execute(QueryState queryState, BatchQueryOptions options, boolean local, long now)
     throws RequestExecutionException, RequestValidationException
     {
         if (options.getConsistency() == null)
             throw new InvalidRequestException("Invalid empty consistency level");
         if (options.getSerialConsistency() == null)
             throw new InvalidRequestException("Invalid empty serial consistency level");

         if (hasConditions)
             return executeWithConditions(options, queryState);

         executeWithoutConditions(getMutations(options, local, now), options.getConsistency());
         return new ResultMessage.Void();
     }

     private void executeWithoutConditions(Collection<? extends IMutation> mutations, ConsistencyLevel cl) throws RequestExecutionException, RequestValidationException
     {
         // Extract each collection of cfs from it's IMutation and then lazily concatenate all of them into a single Iterable.
         Iterable<ColumnFamily> cfs = Iterables.concat(Iterables.transform(mutations, new Function<IMutation, Collection<ColumnFamily>>()
         {
             public Collection<ColumnFamily> apply(IMutation im)
             {
                 return im.getColumnFamilies();
             }
         }));

         verifyBatchSize(cfs);
         verifyBatchType(mutations);

         boolean mutateAtomic = (type == Type.LOGGED && mutations.size() > 1);
         StorageProxy.mutateWithTriggers(mutations, cl, mutateAtomic);
     }

     private ResultMessage executeWithConditions(BatchQueryOptions options, QueryState state)
     throws RequestExecutionException, RequestValidationException
     {
         Pair<CQL3CasRequest, Set<ColumnDefinition>> p = makeCasRequest(options, state);
         CQL3CasRequest casRequest = p.left;
         Set<ColumnDefinition> columnsWithConditions = p.right;

         ColumnFamily result = StorageProxy.cas(casRequest.cfm.ksName,
                                                casRequest.cfm.cfName,
                                                casRequest.key,
                                                casRequest,
                                                options.getSerialConsistency(),
                                                options.getConsistency(),
                                                state.getClientState());

         return new ResultMessage.Rows(ModificationStatement.buildCasResultSet(casRequest.cfm.ksName,
                                                                               casRequest.key,
                                                                               casRequest.cfm.cfName,
                                                                               result,
                                                                               columnsWithConditions,
                                                                               true,
                                                                               options.forStatement(0)));
     }

     private Pair<CQL3CasRequest,Set<ColumnDefinition>> makeCasRequest(BatchQueryOptions options, QueryState state)
     {
         long now = state.getTimestamp();
         ByteBuffer key = null;
         CQL3CasRequest casRequest = null;
         Set<ColumnDefinition> columnsWithConditions = new LinkedHashSet<>();

         for (int i = 0; i < statements.size(); i++)
         {
             ModificationStatement statement = statements.get(i);
             QueryOptions statementOptions = options.forStatement(i);
             long timestamp = attrs.getTimestamp(now, statementOptions);
             List<ByteBuffer> pks = statement.buildPartitionKeyNames(statementOptions);
             if (pks.size() > 1)
                 throw new IllegalArgumentException("Batch with conditions cannot span multiple partitions (you cannot use IN on the partition key)");
             if (key == null)
             {
                 key = pks.get(0);
                 casRequest = new CQL3CasRequest(statement.cfm, key, true);
             }
             else if (!key.equals(pks.get(0)))
             {
                 throw new InvalidRequestException("Batch with conditions cannot span multiple partitions");
             }

             Composite clusteringPrefix = statement.createClusteringPrefix(statementOptions);
             if (statement.hasConditions())
             {
                 statement.addConditions(clusteringPrefix, casRequest, statementOptions);
                 // As soon as we have a ifNotExists, we set columnsWithConditions to null so that everything is in the resultSet
                 if (statement.hasIfNotExistCondition() || statement.hasIfExistCondition())
                     columnsWithConditions = null;
                 else if (columnsWithConditions != null)
                     Iterables.addAll(columnsWithConditions, statement.getColumnsWithConditions());
             }
             casRequest.addRowUpdate(clusteringPrefix, statement, statementOptions, timestamp);
         }

         return Pair.create(casRequest, columnsWithConditions);
     }

     public ResultMessage executeInternal(QueryState queryState, QueryOptions options) throws RequestValidationException, RequestExecutionException
     {
         if (hasConditions)
             return executeInternalWithConditions(BatchQueryOptions.withoutPerStatementVariables(options), queryState);

         executeInternalWithoutCondition(queryState, options);
         return new ResultMessage.Void();
     }

     private ResultMessage executeInternalWithoutCondition(QueryState queryState, QueryOptions options) throws RequestValidationException, RequestExecutionException
     {
         for (IMutation mutation : getMutations(BatchQueryOptions.withoutPerStatementVariables(options), true, queryState.getTimestamp()))
         {
             assert mutation instanceof Mutation || mutation instanceof CounterMutation;

             if (mutation instanceof Mutation)
                 ((Mutation) mutation).apply();
             else if (mutation instanceof CounterMutation)
                 ((CounterMutation) mutation).apply();
         }
         return null;
     }

     private ResultMessage executeInternalWithConditions(BatchQueryOptions options, QueryState state) throws RequestExecutionException, RequestValidationException
     {
         Pair<CQL3CasRequest, Set<ColumnDefinition>> p = makeCasRequest(options, state);
         CQL3CasRequest request = p.left;
         Set<ColumnDefinition> columnsWithConditions = p.right;

         ColumnFamily result = ModificationStatement.casInternal(request, state);

         return new ResultMessage.Rows(ModificationStatement.buildCasResultSet(request.cfm.ksName,
                                                                               request.key,
                                                                               request.cfm.cfName,
                                                                               result,
                                                                               columnsWithConditions,
                                                                               true,
                                                                               options.forStatement(0)));
     }

     public interface BatchVariables
     {
         public List<ByteBuffer> getVariablesForStatement(int statementInBatch);
     }

     public String toString()
     {
         return String.format("BatchStatement(type=%s, statements=%s)", type, statements);
     }

     public static class Parsed extends CFStatement
     {
         private final Type type;
         private final Attributes.Raw attrs;
         private final List<ModificationStatement.Parsed> parsedStatements;

         public Parsed(Type type, Attributes.Raw attrs, List<ModificationStatement.Parsed> parsedStatements)
         {
             super(null);
             this.type = type;
             this.attrs = attrs;
             this.parsedStatements = parsedStatements;
         }

         @Override
         public void prepareKeyspace(ClientState state) throws InvalidRequestException
         {
             for (ModificationStatement.Parsed statement : parsedStatements)
                 statement.prepareKeyspace(state);
         }

         public ParsedStatement.Prepared prepare() throws InvalidRequestException
         {
             VariableSpecifications boundNames = getBoundVariables();

             String firstKS = null;
             String firstCF = null;
             boolean haveMultipleCFs = false;

             List<ModificationStatement> statements = new ArrayList<>(parsedStatements.size());
             for (ModificationStatement.Parsed parsed : parsedStatements)
             {
                 if (firstKS == null)
                 {
                     firstKS = parsed.keyspace();
                     firstCF = parsed.columnFamily();
                 }
                 else if (!haveMultipleCFs)
                 {
                     haveMultipleCFs = !firstKS.equals(parsed.keyspace()) || !firstCF.equals(parsed.columnFamily());
                 }

                 statements.add(parsed.prepare(boundNames));
             }

             Attributes prepAttrs = attrs.prepare("[batch]", "[batch]");
             prepAttrs.collectMarkerSpecification(boundNames);

             BatchStatement batchStatement = new BatchStatement(boundNames.size(), type, statements, prepAttrs);
             batchStatement.validate();

             // Use the CFMetadata of the first statement for partition key bind indexes.  If the statements affect
             // multiple tables, we won't send partition key bind indexes.
             Short[] partitionKeyBindIndexes = (haveMultipleCFs || batchStatement.statements.isEmpty())? null
                                                               : boundNames.getPartitionKeyBindIndexes(batchStatement.statements.get(0).cfm);

             return new ParsedStatement.Prepared(batchStatement, boundNames, partitionKeyBindIndexes);
         }
     }
 }
	/*
	* 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.cql3.statements;

	import java.nio.ByteBuffer;
	import java.util.*;
	import java.util.concurrent.TimeUnit;

	import com.google.common.base.Function;
	import com.google.common.collect.Iterables;

	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.slf4j.helpers.MessageFormatter;

	import org.apache.cassandra.config.ColumnDefinition;
	import org.apache.cassandra.config.DatabaseDescriptor;
	import org.apache.cassandra.cql3.*;
	import org.apache.cassandra.db.*;
	import org.apache.cassandra.db.composites.Composite;
	import org.apache.cassandra.exceptions.*;
	import org.apache.cassandra.service.ClientState;
	import org.apache.cassandra.service.ClientWarn;
	import org.apache.cassandra.service.QueryState;
	import org.apache.cassandra.service.StorageProxy;
	import org.apache.cassandra.tracing.Tracing;
	import org.apache.cassandra.transport.messages.ResultMessage;
	import org.apache.cassandra.utils.NoSpamLogger;
	import org.apache.cassandra.utils.Pair;

	/**
	* A <code>BATCH</code> statement parsed from a CQL query.
	*/
	public class BatchStatement implements CQLStatement
	{
	public enum Type
	{
	LOGGED, UNLOGGED, COUNTER
	}

	private final int boundTerms;
	public final Type type;
	private final List<ModificationStatement> statements;
	private final Attributes attrs;
	private final boolean hasConditions;
	private static final Logger logger = LoggerFactory.getLogger(BatchStatement.class);
	private static final String unloggedBatchWarning = "Unlogged batch covering {} partitions detected against table{} {}. " +
	"You should use a logged batch for atomicity, or asynchronous writes for performance.";

	/**
	* Creates a new BatchStatement from a list of statements and a
	* Thrift consistency level.
	*
	* @param type type of the batch
	* @param statements a list of UpdateStatements
	* @param attrs additional attributes for statement (CL, timestamp, timeToLive)
	*/
	public BatchStatement(int boundTerms, Type type, List<ModificationStatement> statements, Attributes attrs)
	{
	boolean hasConditions = false;
	for (ModificationStatement statement : statements)
	hasConditions \|= statement.hasConditions();

	this.boundTerms = boundTerms;
	this.type = type;
	this.statements = statements;
	this.attrs = attrs;
	this.hasConditions = hasConditions;
	}

	public Iterable<org.apache.cassandra.cql3.functions.Function> getFunctions()
	{
	Iterable<org.apache.cassandra.cql3.functions.Function> functions = attrs.getFunctions();
	for (ModificationStatement statement : statements)
	functions = Iterables.concat(functions, statement.getFunctions());
	return functions;
	}

	public int getBoundTerms()
	{
	return boundTerms;
	}

	public void checkAccess(ClientState state) throws InvalidRequestException, UnauthorizedException
	{
	for (ModificationStatement statement : statements)
	statement.checkAccess(state);
	}

	// Validates a prepared batch statement without validating its nested statements.
	public void validate() throws InvalidRequestException
	{
	if (attrs.isTimeToLiveSet())
	throw new InvalidRequestException("Global TTL on the BATCH statement is not supported.");

	boolean timestampSet = attrs.isTimestampSet();
	if (timestampSet)
	{
	if (hasConditions)
	throw new InvalidRequestException("Cannot provide custom timestamp for conditional BATCH");
	if (type == Type.COUNTER)
	throw new InvalidRequestException("Cannot provide custom timestamp for counter BATCH");
	}

	boolean hasCounters = false;
	boolean hasNonCounters = false;

	for (ModificationStatement statement : statements)
	{
	if (timestampSet && statement.isCounter())
	throw new InvalidRequestException("Cannot provide custom timestamp for a BATCH containing counters");

	if (timestampSet && statement.isTimestampSet())
	throw new InvalidRequestException("Timestamp must be set either on BATCH or individual statements");

	if (type == Type.COUNTER && !statement.isCounter())
	throw new InvalidRequestException("Cannot include non-counter statement in a counter batch");

	if (type == Type.LOGGED && statement.isCounter())
	throw new InvalidRequestException("Cannot include a counter statement in a logged batch");

	if (statement.isCounter())
	hasCounters = true;
	else
	hasNonCounters = true;
	}

	if (hasCounters && hasNonCounters)
	throw new InvalidRequestException("Counter and non-counter mutations cannot exist in the same batch");

	if (hasConditions)
	{
	String ksName = null;
	String cfName = null;
	for (ModificationStatement stmt : statements)
	{
	if (ksName != null && (!stmt.keyspace().equals(ksName) \|\| !stmt.columnFamily().equals(cfName)))
	throw new InvalidRequestException("Batch with conditions cannot span multiple tables");
	ksName = stmt.keyspace();
	cfName = stmt.columnFamily();
	}
	}
	}

	// The batch itself will be validated in either Parsed#prepare() - for regular CQL3 batches,
	// or in QueryProcessor.processBatch() - for native protocol batches.
	public void validate(ClientState state) throws InvalidRequestException
	{
	for (ModificationStatement statement : statements)
	statement.validate(state);
	}

	public List<ModificationStatement> getStatements()
	{
	return statements;
	}

	private Collection<? extends IMutation> getMutations(BatchQueryOptions options, boolean local, long now)
	throws RequestExecutionException, RequestValidationException
	{
	Map<String, Map<ByteBuffer, IMutation>> mutations = new HashMap<>();
	for (int i = 0; i < statements.size(); i++)
	{
	ModificationStatement statement = statements.get(i);
	QueryOptions statementOptions = options.forStatement(i);
	long timestamp = attrs.getTimestamp(now, statementOptions);
	addStatementMutations(statement, statementOptions, local, timestamp, mutations);
	}
	return unzipMutations(mutations);
	}

	private Collection<? extends IMutation> unzipMutations(Map<String, Map<ByteBuffer, IMutation>> mutations)
	{

	// The case where all statement where on the same keyspace is pretty common
	if (mutations.size() == 1)
	return mutations.values().iterator().next().values();


	List<IMutation> ms = new ArrayList<>();
	for (Map<ByteBuffer, IMutation> ksMap : mutations.values())
	ms.addAll(ksMap.values());

	return ms;
	}

	private void addStatementMutations(ModificationStatement statement,
	QueryOptions options,
	boolean local,
	long now,
	Map<String, Map<ByteBuffer, IMutation>> mutations)
	throws RequestExecutionException, RequestValidationException
	{
	String ksName = statement.keyspace();
	Map<ByteBuffer, IMutation> ksMap = mutations.get(ksName);
	if (ksMap == null)
	{
	ksMap = new HashMap<>();
	mutations.put(ksName, ksMap);
	}

	// The following does the same than statement.getMutations(), but we inline it here because
	// we don't want to recreate mutations every time as this is particularly inefficient when applying
	// multiple batch to the same partition (see #6737).
	List<ByteBuffer> keys = statement.buildPartitionKeyNames(options);
	Composite clusteringPrefix = statement.createClusteringPrefix(options);
	UpdateParameters params = statement.makeUpdateParameters(keys, clusteringPrefix, options, local, now);

	for (ByteBuffer key : keys)
	{
	IMutation mutation = ksMap.get(key);
	Mutation mut;
	if (mutation == null)
	{
	mut = new Mutation(ksName, key);
	mutation = statement.cfm.isCounter() ? new CounterMutation(mut, options.getConsistency()) : mut;
	ksMap.put(key, mutation);
	}
	else
	{
	mut = statement.cfm.isCounter() ? ((CounterMutation) mutation).getMutation() : (Mutation) mutation;
	}

	statement.addUpdateForKey(mut.addOrGet(statement.cfm), key, clusteringPrefix, params);
	}
	}

	/**
	* Checks batch size to ensure threshold is met. If not, a warning is logged.
	*
	* @param cfs ColumnFamilies that will store the batch's mutations.
	*/
	public static void verifyBatchSize(Iterable<ColumnFamily> cfs) throws InvalidRequestException
	{
	long size = 0;
	long warnThreshold = DatabaseDescriptor.getBatchSizeWarnThreshold();
	long failThreshold = DatabaseDescriptor.getBatchSizeFailThreshold();

	for (ColumnFamily cf : cfs)
	size += cf.dataSize();

	if (size > warnThreshold)
	{
	Set<String> ksCfPairs = new HashSet<>();
	for (ColumnFamily cf : cfs)
	ksCfPairs.add(String.format("%s.%s", cf.metadata().ksName, cf.metadata().cfName));

	String format = "Batch of prepared statements for {} is of size {}, exceeding specified threshold of {} by {}.{}";
	if (size > failThreshold)
	{
	Tracing.trace(format, ksCfPairs, size, failThreshold, size - failThreshold, " (see batch_size_fail_threshold_in_kb)");
	logger.error(format, ksCfPairs, size, failThreshold, size - failThreshold, " (see batch_size_fail_threshold_in_kb)");
	throw new InvalidRequestException("Batch too large");
	}
	else if (logger.isWarnEnabled())
	{
	logger.warn(format, ksCfPairs, size, warnThreshold, size - warnThreshold, "");
	}
	ClientWarn.instance.warn(MessageFormatter.arrayFormat(format, new Object[]{ ksCfPairs, size, warnThreshold, size - warnThreshold, "" }).getMessage());
	}
	}

	private void verifyBatchType(Collection<? extends IMutation> mutations)
	{
	if (type != Type.LOGGED && mutations.size() > 1)
	{
	Set<String> ksCfPairs = new HashSet<>();
	Set<ByteBuffer> keySet = new HashSet<>();

	for (IMutation im : mutations)
	{
	keySet.add(im.key());

	for (ColumnFamily cf : im.getColumnFamilies())
	ksCfPairs.add(String.format("%s.%s", cf.metadata().ksName, cf.metadata().cfName));
	}

	// CASSANDRA-11529: log only if we have more than a threshold of keys, this was also suggested in the
	// original ticket that introduced this warning, CASSANDRA-9282
	if (keySet.size() > DatabaseDescriptor.getUnloggedBatchAcrossPartitionsWarnThreshold())
	{
	NoSpamLogger.log(logger, NoSpamLogger.Level.WARN, 1, TimeUnit.MINUTES, unloggedBatchWarning,
	keySet.size(), ksCfPairs.size() == 1 ? "" : "s", ksCfPairs);

	ClientWarn.instance.warn(MessageFormatter.arrayFormat(unloggedBatchWarning,
	new Object[]{
	keySet.size(),
	ksCfPairs.size() == 1 ? "" : "s",
	ksCfPairs
	}).getMessage());
	}
	}
	}


	public ResultMessage execute(QueryState queryState, QueryOptions options) throws RequestExecutionException, RequestValidationException
	{
	return execute(queryState, BatchQueryOptions.withoutPerStatementVariables(options));
	}

	public ResultMessage execute(QueryState queryState, BatchQueryOptions options) throws RequestExecutionException, RequestValidationException
	{
	return execute(queryState, options, false, options.getTimestamp(queryState));
	}

	private ResultMessage execute(QueryState queryState, BatchQueryOptions options, boolean local, long now)
	throws RequestExecutionException, RequestValidationException
	{
	if (options.getConsistency() == null)
	throw new InvalidRequestException("Invalid empty consistency level");
	if (options.getSerialConsistency() == null)
	throw new InvalidRequestException("Invalid empty serial consistency level");

	if (hasConditions)
	return executeWithConditions(options, queryState);

	executeWithoutConditions(getMutations(options, local, now), options.getConsistency());
	return new ResultMessage.Void();
	}

	private void executeWithoutConditions(Collection<? extends IMutation> mutations, ConsistencyLevel cl) throws RequestExecutionException, RequestValidationException
	{
	// Extract each collection of cfs from it's IMutation and then lazily concatenate all of them into a single Iterable.
	Iterable<ColumnFamily> cfs = Iterables.concat(Iterables.transform(mutations, new Function<IMutation, Collection<ColumnFamily>>()
	{
	public Collection<ColumnFamily> apply(IMutation im)
	{
	return im.getColumnFamilies();
	}
	}));

	verifyBatchSize(cfs);
	verifyBatchType(mutations);

	boolean mutateAtomic = (type == Type.LOGGED && mutations.size() > 1);
	StorageProxy.mutateWithTriggers(mutations, cl, mutateAtomic);
	}

	private ResultMessage executeWithConditions(BatchQueryOptions options, QueryState state)
	throws RequestExecutionException, RequestValidationException
	{
	Pair<CQL3CasRequest, Set<ColumnDefinition>> p = makeCasRequest(options, state);
	CQL3CasRequest casRequest = p.left;
	Set<ColumnDefinition> columnsWithConditions = p.right;

	ColumnFamily result = StorageProxy.cas(casRequest.cfm.ksName,
	casRequest.cfm.cfName,
	casRequest.key,
	casRequest,
	options.getSerialConsistency(),
	options.getConsistency(),
	state.getClientState());

	return new ResultMessage.Rows(ModificationStatement.buildCasResultSet(casRequest.cfm.ksName,
	casRequest.key,
	casRequest.cfm.cfName,
	result,
	columnsWithConditions,
	true,
	options.forStatement(0)));
	}

	private Pair<CQL3CasRequest,Set<ColumnDefinition>> makeCasRequest(BatchQueryOptions options, QueryState state)
	{
	long now = state.getTimestamp();
	ByteBuffer key = null;
	CQL3CasRequest casRequest = null;
	Set<ColumnDefinition> columnsWithConditions = new LinkedHashSet<>();

	for (int i = 0; i < statements.size(); i++)
	{
	ModificationStatement statement = statements.get(i);
	QueryOptions statementOptions = options.forStatement(i);
	long timestamp = attrs.getTimestamp(now, statementOptions);
	List<ByteBuffer> pks = statement.buildPartitionKeyNames(statementOptions);
	if (pks.size() > 1)
	throw new IllegalArgumentException("Batch with conditions cannot span multiple partitions (you cannot use IN on the partition key)");
	if (key == null)
	{
	key = pks.get(0);
	casRequest = new CQL3CasRequest(statement.cfm, key, true);
	}
	else if (!key.equals(pks.get(0)))
	{
	throw new InvalidRequestException("Batch with conditions cannot span multiple partitions");
	}

	Composite clusteringPrefix = statement.createClusteringPrefix(statementOptions);
	if (statement.hasConditions())
	{
	statement.addConditions(clusteringPrefix, casRequest, statementOptions);
	// As soon as we have a ifNotExists, we set columnsWithConditions to null so that everything is in the resultSet
	if (statement.hasIfNotExistCondition() \|\| statement.hasIfExistCondition())
	columnsWithConditions = null;
	else if (columnsWithConditions != null)
	Iterables.addAll(columnsWithConditions, statement.getColumnsWithConditions());
	}
	casRequest.addRowUpdate(clusteringPrefix, statement, statementOptions, timestamp);
	}

	return Pair.create(casRequest, columnsWithConditions);
	}

	public ResultMessage executeInternal(QueryState queryState, QueryOptions options) throws RequestValidationException, RequestExecutionException
	{
	if (hasConditions)
	return executeInternalWithConditions(BatchQueryOptions.withoutPerStatementVariables(options), queryState);

	executeInternalWithoutCondition(queryState, options);
	return new ResultMessage.Void();
	}

	private ResultMessage executeInternalWithoutCondition(QueryState queryState, QueryOptions options) throws RequestValidationException, RequestExecutionException
	{
	for (IMutation mutation : getMutations(BatchQueryOptions.withoutPerStatementVariables(options), true, queryState.getTimestamp()))
	{
	assert mutation instanceof Mutation \|\| mutation instanceof CounterMutation;

	if (mutation instanceof Mutation)
	((Mutation) mutation).apply();
	else if (mutation instanceof CounterMutation)
	((CounterMutation) mutation).apply();
	}
	return null;
	}

	private ResultMessage executeInternalWithConditions(BatchQueryOptions options, QueryState state) throws RequestExecutionException, RequestValidationException
	{
	Pair<CQL3CasRequest, Set<ColumnDefinition>> p = makeCasRequest(options, state);
	CQL3CasRequest request = p.left;
	Set<ColumnDefinition> columnsWithConditions = p.right;

	ColumnFamily result = ModificationStatement.casInternal(request, state);

	return new ResultMessage.Rows(ModificationStatement.buildCasResultSet(request.cfm.ksName,
	request.key,
	request.cfm.cfName,
	result,
	columnsWithConditions,
	true,
	options.forStatement(0)));
	}

	public interface BatchVariables
	{
	public List<ByteBuffer> getVariablesForStatement(int statementInBatch);
	}

	public String toString()
	{
	return String.format("BatchStatement(type=%s, statements=%s)", type, statements);
	}

	public static class Parsed extends CFStatement
	{
	private final Type type;
	private final Attributes.Raw attrs;
	private final List<ModificationStatement.Parsed> parsedStatements;

	public Parsed(Type type, Attributes.Raw attrs, List<ModificationStatement.Parsed> parsedStatements)
	{
	super(null);
	this.type = type;
	this.attrs = attrs;
	this.parsedStatements = parsedStatements;
	}

	@Override
	public void prepareKeyspace(ClientState state) throws InvalidRequestException
	{
	for (ModificationStatement.Parsed statement : parsedStatements)
	statement.prepareKeyspace(state);
	}

	public ParsedStatement.Prepared prepare() throws InvalidRequestException
	{
	VariableSpecifications boundNames = getBoundVariables();

	String firstKS = null;
	String firstCF = null;
	boolean haveMultipleCFs = false;

	List<ModificationStatement> statements = new ArrayList<>(parsedStatements.size());
	for (ModificationStatement.Parsed parsed : parsedStatements)
	{
	if (firstKS == null)
	{
	firstKS = parsed.keyspace();
	firstCF = parsed.columnFamily();
	}
	else if (!haveMultipleCFs)
	{
	haveMultipleCFs = !firstKS.equals(parsed.keyspace()) \|\| !firstCF.equals(parsed.columnFamily());
	}

	statements.add(parsed.prepare(boundNames));
	}

	Attributes prepAttrs = attrs.prepare("[batch]", "[batch]");
	prepAttrs.collectMarkerSpecification(boundNames);

	BatchStatement batchStatement = new BatchStatement(boundNames.size(), type, statements, prepAttrs);
	batchStatement.validate();

	// Use the CFMetadata of the first statement for partition key bind indexes. If the statements affect
	// multiple tables, we won't send partition key bind indexes.
	Short[] partitionKeyBindIndexes = (haveMultipleCFs \|\| batchStatement.statements.isEmpty())? null
	: boundNames.getPartitionKeyBindIndexes(batchStatement.statements.get(0).cfm);

	return new ParsedStatement.Prepared(batchStatement, boundNames, partitionKeyBindIndexes);
	}
	}
	}