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/*
* 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.drill.exec.work.user;
import java.util.List;
import org.apache.drill.exec.ops.QueryContext;
import org.apache.drill.exec.physical.PhysicalPlan;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.planner.fragment.Fragment;
import org.apache.drill.exec.planner.fragment.MakeFragmentsVisitor;
import org.apache.drill.exec.planner.fragment.SimpleParallelizer;
import org.apache.drill.exec.planner.fragment.contrib.SplittingParallelizer;
import org.apache.drill.exec.planner.sql.DrillSqlWorker;
import org.apache.drill.exec.proto.BitControl.PlanFragment;
import org.apache.drill.exec.proto.UserBitShared.DrillPBError;
import org.apache.drill.exec.proto.UserBitShared.QueryId;
import org.apache.drill.exec.proto.UserBitShared.QueryResult.QueryState;
import org.apache.drill.exec.proto.UserProtos.GetQueryPlanFragments;
import org.apache.drill.exec.proto.UserProtos.QueryPlanFragments;
import org.apache.drill.exec.proto.helper.QueryIdHelper;
import org.apache.drill.exec.rpc.UserClientConnection;
import org.apache.drill.exec.server.DrillbitContext;
import org.apache.drill.exec.util.Pointer;
import org.apache.drill.exec.work.QueryWorkUnit;
import org.apache.drill.exec.work.foreman.rm.QueryResourceAllocator;
import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
/**
* Helper class to return PlanFragments based on the query plan
* or based on split query plan
* As of now it is only invoked once per query and therefore cheap to create PlanSplitter object
* on heap.
*/
public class PlanSplitter {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(PlanSplitter.class);
/**
* Method to plan the query and return list of fragments
* it will return query plan "as is" or split plans based on the req setting: split_plan
* @param dContext
* @param queryId
* @param req
* @param connection
* @return
*/
@SuppressWarnings("resource")
public QueryPlanFragments planFragments(DrillbitContext dContext, QueryId queryId,
GetQueryPlanFragments req, UserClientConnection connection) {
QueryPlanFragments.Builder responseBuilder = QueryPlanFragments.newBuilder();
final QueryContext queryContext = new QueryContext(connection.getSession(), dContext, queryId);
responseBuilder.setQueryId(queryId);
try {
responseBuilder.addAllFragments(getFragments(dContext, req, queryContext, queryId));
responseBuilder.setStatus(QueryState.COMPLETED);
} catch (Exception e) {
final String errorMessage = String.format("Failed to produce PlanFragments for query id \"%s\" with "
+ "request to %s plan", queryId, (req.getSplitPlan() ? "split" : "no split"));
DrillPBError error = DrillPBError.newBuilder().setMessage(errorMessage).setErrorType(DrillPBError.ErrorType.PLAN).build();
responseBuilder.setStatus(QueryState.FAILED);
responseBuilder.setError(error);
}
try {
queryContext.close();
} catch (Exception e) {
logger.error("Error closing QueryContext when getting plan fragments for query {}.",
QueryIdHelper.getQueryId(queryId), e);
}
return responseBuilder.build();
}
private List<PlanFragment> getFragments(final DrillbitContext dContext, final GetQueryPlanFragments req,
final QueryContext queryContext, final QueryId queryId) throws Exception {
final PhysicalPlan plan;
final String query = req.getQuery();
switch(req.getType()) {
case SQL:
final Pointer<String> textPlan = new Pointer<>();
plan = DrillSqlWorker.getPlan(queryContext, query, textPlan);
break;
case PHYSICAL:
plan = dContext.getPlanReader().readPhysicalPlan(query);
break;
default:
throw new IllegalStateException("Planning fragments supports only SQL or PHYSICAL QueryType");
}
QueryResourceAllocator planner = dContext.getResourceManager().newResourceAllocator(queryContext);
planner.visitAbstractPlan(plan);
final PhysicalOperator rootOperator = plan.getSortedOperators(false).iterator().next();
final Fragment rootFragment = rootOperator.accept(MakeFragmentsVisitor.INSTANCE, null);
final SimpleParallelizer parallelizer = new SplittingParallelizer(plan.getProperties().hasResourcePlan, queryContext);
List<PlanFragment> fragments = Lists.newArrayList();
if ( req.getSplitPlan() ) {
final List<QueryWorkUnit> queryWorkUnits = parallelizer.getSplitFragments(
queryContext.getOptions().getOptionList(), queryContext.getCurrentEndpoint(),
queryId, queryContext.getActiveEndpoints(), dContext.getPlanReader(), rootFragment,
queryContext.getSession(), queryContext.getQueryContextInfo());
for (QueryWorkUnit queryWorkUnit : queryWorkUnits) {
planner.visitPhysicalPlan(queryWorkUnit);
queryWorkUnit.applyPlan(dContext.getPlanReader());
fragments.add(queryWorkUnit.getRootFragment());
List<PlanFragment> childFragments = queryWorkUnit.getFragments();
if (!childFragments.isEmpty()) {
throw new IllegalStateException("Split plans can not have more then one fragment");
}
}
} else {
final QueryWorkUnit queryWorkUnit = parallelizer.generateWorkUnit(queryContext.getOptions().getOptionList(), queryContext.getCurrentEndpoint(),
queryId, queryContext.getActiveEndpoints(), rootFragment,
queryContext.getSession(), queryContext.getQueryContextInfo());
planner.visitPhysicalPlan(queryWorkUnit);
queryWorkUnit.applyPlan(dContext.getPlanReader());
fragments.add(queryWorkUnit.getRootFragment());
fragments.addAll(queryWorkUnit.getFragments());
}
return fragments;
}
}
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