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com.stratio.cassandra.lucene.IndexQueryHandler Maven / Gradle / Ivy
/*
* Licensed to STRATIO (C) under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. The STRATIO (C) 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 com.stratio.cassandra.lucene;
import com.stratio.cassandra.lucene.service.RowKeys;
import com.stratio.cassandra.lucene.service.RowMapper;
import com.stratio.cassandra.lucene.util.ByteBufferUtils;
import com.stratio.cassandra.lucene.util.TimeCounter;
import org.apache.cassandra.cql3.*;
import org.apache.cassandra.cql3.functions.Function;
import org.apache.cassandra.cql3.statements.BatchStatement;
import org.apache.cassandra.cql3.statements.ParsedStatement;
import org.apache.cassandra.cql3.statements.SelectStatement;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.filter.IDiskAtomFilter;
import org.apache.cassandra.db.index.SecondaryIndexManager;
import org.apache.cassandra.db.index.SecondaryIndexSearcher;
import org.apache.cassandra.dht.AbstractBounds;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.exceptions.RequestExecutionException;
import org.apache.cassandra.exceptions.RequestValidationException;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.LuceneStorageProxy;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.service.pager.PagingState;
import org.apache.cassandra.transport.messages.ResultMessage;
import org.apache.cassandra.utils.MD5Digest;
import org.apache.cassandra.utils.Pair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* Abstract {@link QueryHandler} to be used with Lucene searches.
*
* @author Andres de la Pena {@literal }
*/
public class IndexQueryHandler implements QueryHandler {
private static final Logger logger = LoggerFactory.getLogger(IndexQueryHandler.class);
static QueryProcessor cqlProcessor = QueryProcessor.instance;
private IDiskAtomFilter makeFilter(SelectStatement statement, QueryOptions options, int limit)
throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
Method method = SelectStatement.class.getDeclaredMethod("makeFilter", QueryOptions.class, int.class);
method.setAccessible(true);
return (IDiskAtomFilter) method.invoke(statement, options, limit);
}
private static boolean hasAnyAggregateFunctions(SelectStatement selectStatement) throws Exception {
if (selectStatement.getFunctions() != null) {
Iterator functions = selectStatement.getFunctions().iterator();
while (functions.hasNext()) {
Function function = functions.next();
if (function.isAggregate()) {
return true;
}
}
}
return false;
}
@Override
public ResultMessage.Prepared prepare(String query, QueryState state, Map customPayload)
throws RequestValidationException {
return cqlProcessor.prepare(query, state);
}
@Override
public ParsedStatement.Prepared getPrepared(MD5Digest id) {
return cqlProcessor.getPrepared(id);
}
@Override
public ParsedStatement.Prepared getPreparedForThrift(Integer id) {
return cqlProcessor.getPreparedForThrift(id);
}
@Override
public ResultMessage processPrepared(CQLStatement statement, QueryState state, QueryOptions options,
Map customPayload)
throws RequestExecutionException, RequestValidationException {
return cqlProcessor.processPrepared(statement, state, options);
}
@Override
public ResultMessage processBatch(BatchStatement statement, QueryState state, BatchQueryOptions options,
Map customPayload)
throws RequestExecutionException, RequestValidationException {
return cqlProcessor.processBatch(statement, state, options);
}
@Override
public ResultMessage process(String query, QueryState state, QueryOptions options,
Map customPayload)
throws RequestExecutionException, RequestValidationException {
ParsedStatement.Prepared p = QueryProcessor.getStatement(query, state.getClientState());
options.prepare(p.boundNames);
CQLStatement prepared = p.statement;
if (prepared.getBoundTerms() != options.getValues().size()) {
throw new InvalidRequestException("Invalid amount of bind variables");
}
if (!state.getClientState().isInternal) {
QueryProcessor.metrics.regularStatementsExecuted.inc();
}
if (prepared instanceof SelectStatement) {
SelectStatement select = (SelectStatement) prepared;
List expressions = select.getValidatedIndexExpressions(options);
ColumnFamilyStore cfs = Keyspace.open(select.keyspace()).getColumnFamilyStore(select.columnFamily());
SecondaryIndexManager secondaryIndexManager = cfs.indexManager;
SecondaryIndexSearcher searcher = secondaryIndexManager.getHighestSelectivityIndexSearcher(expressions);
if (searcher instanceof IndexSearcher) {
try {
TimeCounter time = TimeCounter.create().start();
ResultMessage msg = process((IndexSearcher) searcher, expressions, select, state, options);
logger.debug("Total Lucene query time: {}\n", time.stop());
return msg;
} catch (RequestExecutionException | RequestValidationException e) {
throw e;
} catch (Exception e) {
throw new IndexException(e);
}
}
}
return cqlProcessor.processStatement(prepared, state, options);
}
private ResultMessage process(IndexSearcher searcher,
List expressions,
SelectStatement statement,
QueryState state,
QueryOptions options) throws Exception {
ClientState clientState = state.getClientState();
statement.checkAccess(clientState);
statement.validate(clientState);
int limit = statement.getLimit(options);
int page = options.getPageSize();
boolean isAggregateFunction = hasAnyAggregateFunctions(statement);
String ks = statement.keyspace();
String cf = statement.columnFamily();
long now = System.currentTimeMillis();
ConsistencyLevel cl = options.getConsistency();
if (cl == null) {
throw new InvalidRequestException("Invalid empty consistency level");
}
cl.validateForRead(ks);
IDiskAtomFilter filter = makeFilter(statement, options, limit);
AbstractBounds range = statement.getRestrictions().getPartitionKeyBounds(options);
RowMapper mapper = searcher.mapper();
PagingState pagingState = options.getPagingState();
RowKeys rowKeys = null;
if (pagingState != null) {
limit = pagingState.remaining;
ByteBuffer bb = pagingState.partitionKey;
if (!ByteBufferUtils.isEmpty(bb)) {
rowKeys = mapper.rowKeys(bb);
}
}
int rowsPerCommand = page > 0 ? page : limit;
List rows = new ArrayList<>();
int remaining;
int collectedRows;
do {
Pair, RowKeys> results = LuceneStorageProxy.getRangeSlice(searcher,
ks,
cf,
now,
filter,
range,
expressions,
rowsPerCommand,
cl,
rowKeys,
isAggregateFunction);
collectedRows = results.left.size();
rows.addAll(results.left);
rowKeys = results.right;
remaining = limit - rows.size();
} while (isAggregateFunction && remaining > 0 && collectedRows == rowsPerCommand);
ResultMessage.Rows msg = statement.processResults(rows, options, limit, now);
if (!isAggregateFunction && remaining > 0 && rows.size() == rowsPerCommand) {
ByteBuffer bb = mapper.byteBuffer(rowKeys);
pagingState = new PagingState(bb, null, remaining);
msg.result.metadata.setHasMorePages(pagingState);
}
return msg;
}
}
