| /* |
| * 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.server.rest; |
| |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryMXBean; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.common.exceptions.UserRemoteException; |
| import org.apache.drill.exec.ExecConstants; |
| import org.apache.drill.exec.proto.UserBitShared.QueryId; |
| import org.apache.drill.exec.proto.UserBitShared.QueryType; |
| import org.apache.drill.exec.proto.UserBitShared.QueryResult.QueryState; |
| import org.apache.drill.exec.proto.helper.QueryIdHelper; |
| import org.apache.drill.exec.work.WorkManager; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class RestQueryRunner extends BaseQueryRunner { |
| private static final Logger logger = LoggerFactory.getLogger(QueryWrapper.class); |
| private static final MemoryMXBean memMXBean = ManagementFactory.getMemoryMXBean(); |
| |
| private final QueryWrapper query; |
| |
| public RestQueryRunner(final QueryWrapper query, final WorkManager workManager, final WebUserConnection webUserConnection) { |
| super(workManager, webUserConnection); |
| this.query = query; |
| } |
| |
| public QueryResult run() throws Exception { |
| applyUserName(query.getUserName()); |
| applyOptions(query.getOptions()); |
| applyDefaultSchema(query.getDefaultSchema()); |
| applyRowLimit(query.getAutoLimitRowCount()); |
| return submitQuery(); |
| } |
| |
| private QueryResult submitQuery() { |
| webUserConnection.setAutoLimitRowCount(maxRows); |
| startQuery(QueryType.valueOf(query.getQueryType()), |
| query.getQuery(), |
| webUserConnection); |
| |
| // Heap usage threshold/trigger to provide resiliency on web server for queries submitted via HTTP |
| double memoryFailureThreshold = workManager.getContext().getConfig().getDouble(ExecConstants.HTTP_MEMORY_HEAP_FAILURE_THRESHOLD); |
| |
| boolean isComplete = false; |
| boolean nearlyOutOfHeapSpace = false; |
| float usagePercent = getHeapUsage(); |
| |
| // Wait until the query execution is complete or there is error submitting the query |
| logger.debug("Wait until the query execution is complete or there is error submitting the query"); |
| do { |
| try { |
| isComplete = webUserConnection.await(TimeUnit.SECONDS.toMillis(1)); //periodically timeout 1 sec to check heap |
| } catch (InterruptedException e) {} |
| usagePercent = getHeapUsage(); |
| if (memoryFailureThreshold > 0 && usagePercent > memoryFailureThreshold) { |
| nearlyOutOfHeapSpace = true; |
| } |
| } while (!isComplete && !nearlyOutOfHeapSpace); |
| |
| // Fail if nearly out of heap space |
| if (nearlyOutOfHeapSpace) { |
| UserException almostOutOfHeapException = UserException.resourceError() |
| .message("There is not enough heap memory to run this query using the web interface. ") |
| .addContext("Please try a query with fewer columns or with a filter or limit condition to limit the data returned. ") |
| .addContext("You can also try an ODBC/JDBC client. ") |
| .build(logger); |
| //Add event |
| workManager.getBee().getForemanForQueryId(queryId) |
| .addToEventQueue(QueryState.FAILED, almostOutOfHeapException); |
| //Return NearlyOutOfHeap exception |
| throw almostOutOfHeapException; |
| } |
| |
| logger.trace("Query {} is completed ", queryId); |
| |
| if (webUserConnection.getError() != null) { |
| throw new UserRemoteException(webUserConnection.getError()); |
| } |
| |
| return new QueryResult(queryId, webUserConnection, webUserConnection.results); |
| } |
| |
| // Detect possible excess heap |
| private float getHeapUsage() { |
| return (float) memMXBean.getHeapMemoryUsage().getUsed() / memMXBean.getHeapMemoryUsage().getMax(); |
| } |
| |
| public static class QueryResult { |
| private final String queryId; |
| public final Collection<String> columns; |
| public final List<Map<String, String>> rows; |
| public final List<String> metadata; |
| public final String queryState; |
| public final int attemptedAutoLimit; |
| |
| // DRILL-6847: Modified the constructor so that the method has access |
| // to all the properties in webUserConnection |
| public QueryResult(QueryId queryId, WebUserConnection webUserConnection, List<Map<String, String>> rows) { |
| this.queryId = QueryIdHelper.getQueryId(queryId); |
| this.columns = webUserConnection.columns; |
| this.metadata = webUserConnection.metadata; |
| this.queryState = webUserConnection.getQueryState(); |
| this.rows = rows; |
| this.attemptedAutoLimit = webUserConnection.getAutoLimitRowCount(); |
| } |
| |
| public String getQueryId() { |
| return queryId; |
| } |
| } |
| } |