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DRILL-6454: Native MapR DB plugin support for Hive MapR-DB json table
closes #1314
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186
...apache/drill/exec/planner/sql/logical/ConvertHiveMapRDBJsonScanToDrillMapRDBJsonScan.java
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| Original file line number | Original file line | Diff line number | Diff line change |
|---|---|---|---|
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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.planner.sql.logical; | |||
|
|
|||
| import org.apache.calcite.plan.RelOptRuleCall; | |||
| import org.apache.calcite.rel.type.RelDataType; | |||
| import org.apache.calcite.rel.type.RelDataTypeFactory; | |||
| import org.apache.calcite.rel.type.RelDataTypeField; | |||
| import org.apache.drill.common.exceptions.UserException; | |||
| import org.apache.drill.common.expression.SchemaPath; | |||
| import org.apache.drill.exec.ExecConstants; | |||
| import org.apache.drill.exec.planner.logical.DrillScanRel; | |||
| import org.apache.drill.exec.planner.logical.RelOptHelper; | |||
| import org.apache.drill.exec.store.StoragePluginOptimizerRule; | |||
| import org.apache.drill.exec.store.hive.HiveMetadataProvider; | |||
| import org.apache.drill.exec.store.hive.HiveReadEntry; | |||
| import org.apache.drill.exec.store.hive.HiveScan; | |||
| import org.apache.drill.exec.store.mapr.db.MapRDBFormatPlugin; | |||
| import org.apache.drill.exec.store.mapr.db.MapRDBFormatPluginConfig; | |||
| import org.apache.drill.exec.store.mapr.db.json.JsonScanSpec; | |||
| import org.apache.drill.exec.store.mapr.db.json.JsonTableGroupScan; | |||
| import org.ojai.DocumentConstants; | |||
|
|
|||
| import java.util.List; | |||
| import java.util.Map; | |||
| import java.util.stream.Collectors; | |||
|
|
|||
| import static org.apache.drill.exec.store.hive.HiveUtilities.nativeReadersRuleMatches; | |||
|
|
|||
| /** | |||
| * Convert Hive scan to use Drill's native MapR-DB reader instead of Hive's MapR-DB JSON Handler. | |||
| */ | |||
| public class ConvertHiveMapRDBJsonScanToDrillMapRDBJsonScan extends StoragePluginOptimizerRule { | |||
| private static final org.slf4j.Logger logger = | |||
| org.slf4j.LoggerFactory.getLogger(ConvertHiveMapRDBJsonScanToDrillMapRDBJsonScan.class); | |||
|
|
|||
| public static final ConvertHiveMapRDBJsonScanToDrillMapRDBJsonScan INSTANCE = | |||
| new ConvertHiveMapRDBJsonScanToDrillMapRDBJsonScan(); | |||
|
|
|||
| /** | |||
| * The constants from org.apache.hadoop.hive.maprdb.json.conf.MapRDBConstants | |||
| */ | |||
| private static final String MAPRDB_PFX = "maprdb."; | |||
| private static final String MAPRDB_TABLE_NAME = MAPRDB_PFX + "table.name"; | |||
| private static final String ID_KEY = DocumentConstants.ID_KEY; | |||
| private static final String MAPRDB_COLUMN_ID = MAPRDB_PFX + "column.id"; | |||
|
|
|||
| private ConvertHiveMapRDBJsonScanToDrillMapRDBJsonScan() { | |||
| super(RelOptHelper.any(DrillScanRel.class), "ConvertHiveScanToHiveDrillNativeScan:MapR-DB"); | |||
| } | |||
|
|
|||
| /** | |||
| * {@see org.apache.drill.exec.store.hive.HiveUtilities#nativeReadersRuleMatches} | |||
| */ | |||
| @Override | |||
| public boolean matches(RelOptRuleCall call) { | |||
| try { | |||
| return nativeReadersRuleMatches(call, | |||
| Class.forName("org.apache.hadoop.hive.maprdb.json.input.HiveMapRDBJsonInputFormat")); | |||
| } catch (ClassNotFoundException e) { | |||
| throw UserException.resourceError(e) | |||
| .message("Current Drill build is not designed for working with Hive MapR-DB tables. " + | |||
| "Please disable \"%s\" option", ExecConstants.HIVE_OPTIMIZE_MAPRDB_JSON_SCAN_WITH_NATIVE_READER) | |||
| .build(logger); | |||
| } | |||
| } | |||
|
|
|||
| @Override | |||
| public void onMatch(RelOptRuleCall call) { | |||
| try { | |||
| DrillScanRel hiveScanRel = call.rel(0); | |||
|
|
|||
| HiveScan hiveScan = (HiveScan) hiveScanRel.getGroupScan(); | |||
| HiveReadEntry hiveReadEntry = hiveScan.getHiveReadEntry(); | |||
| HiveMetadataProvider hiveMetadataProvider = new HiveMetadataProvider(hiveScan.getUserName(), hiveReadEntry, | |||
| hiveScan.getStoragePlugin().getHiveConf()); | |||
| if (hiveMetadataProvider.getInputSplits(hiveReadEntry).isEmpty()) { | |||
| // table is empty, use original scan | |||
| return; | |||
| } | |||
|
|
|||
| if (hiveScan.getHiveReadEntry().getTable().isSetPartitionKeys()) { | |||
| logger.warn("Hive MapR-DB JSON Handler doesn't support table partitioning. Consider recreating table without " + | |||
| "partitions"); | |||
| } | |||
|
|
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| DrillScanRel nativeScanRel = createNativeScanRel(hiveScanRel); | |||
| call.transformTo(nativeScanRel); | |||
|
|
|||
| /* | |||
| Drill native scan should take precedence over Hive since it's more efficient and faster. | |||
| Hive does not always give correct costing (i.e. for external tables Hive does not have number of rows | |||
| and we calculate them approximately). On the contrary, Drill calculates number of rows exactly | |||
| and thus Hive Scan can be chosen instead of Drill native scan because costings allegedly lower for Hive. | |||
| To ensure Drill MapR-DB Json scan will be chosen, reduce Hive scan importance to 0. | |||
| */ | |||
| call.getPlanner().setImportance(hiveScanRel, 0.0); | |||
| } catch (final Exception e) { | |||
| logger.warn("Failed to convert HiveScan to JsonScanSpec", e); | |||
| } | |||
| } | |||
|
|
|||
| /** | |||
| * Helper method which creates a DrillScanRel with native Drill HiveScan. | |||
| */ | |||
| private DrillScanRel createNativeScanRel(final DrillScanRel hiveScanRel) throws Exception { | |||
| RelDataTypeFactory typeFactory = hiveScanRel.getCluster().getTypeFactory(); | |||
| HiveScan hiveScan = (HiveScan) hiveScanRel.getGroupScan(); | |||
| Map<String, String> parameters = hiveScan.getHiveReadEntry().getHiveTableWrapper().getParameters(); | |||
|
|
|||
| JsonScanSpec scanSpec = new JsonScanSpec(parameters.get(MAPRDB_TABLE_NAME), null); | |||
| MapRDBFormatPlugin mapRDBFormatPlugin = new MapRDBFormatPlugin( | |||
| "hive-maprdb", | |||
| hiveScan.getStoragePlugin().getContext(), | |||
| hiveScan.getHiveConf(), | |||
| hiveScan.getStoragePlugin().getConfig(), | |||
| new MapRDBFormatPluginConfig() | |||
| ); | |||
| List<SchemaPath> hiveScanCols = hiveScanRel.getColumns().stream() | |||
| .map(colNameSchemaPath -> replaceOverriddenSchemaPath(parameters, colNameSchemaPath)) | |||
| .collect(Collectors.toList()); | |||
| JsonTableGroupScan nariveMapRDBScan = | |||
| new JsonTableGroupScan( | |||
| hiveScan.getUserName(), | |||
| hiveScan.getStoragePlugin(), | |||
| mapRDBFormatPlugin, | |||
| scanSpec, | |||
| hiveScanCols | |||
| ); | |||
|
|
|||
| List<String> nativeScanColNames = hiveScanRel.getRowType().getFieldList().stream() | |||
| .map(field -> replaceOverriddenColumnId(parameters, field.getName())) | |||
| .collect(Collectors.toList()); | |||
| List<RelDataType> nativeScanColTypes = hiveScanRel.getRowType().getFieldList().stream() | |||
| .map(RelDataTypeField::getType) | |||
| .collect(Collectors.toList()); | |||
| RelDataType nativeScanRowType = typeFactory.createStructType(nativeScanColTypes, nativeScanColNames); | |||
|
|
|||
| return new DrillScanRel( | |||
| hiveScanRel.getCluster(), | |||
| hiveScanRel.getTraitSet(), | |||
| hiveScanRel.getTable(), | |||
| nariveMapRDBScan, | |||
| nativeScanRowType, | |||
| hiveScanCols); | |||
| } | |||
|
|
|||
| /** | |||
| * Hive maps column id "_id" with custom user column id name. Replace it for {@link DrillScanRel} | |||
| * | |||
| * @param parameters Hive table properties | |||
| * @param colName Hive column name | |||
| * @return original column name, null if colName is absent | |||
| */ | |||
| private String replaceOverriddenColumnId(Map<String, String> parameters, String colName) { | |||
| return colName != null && colName.equals(parameters.get(MAPRDB_COLUMN_ID)) ? ID_KEY : colName; | |||
| } | |||
|
|
|||
| /** | |||
| * The same as above, but for {@link SchemaPath} object | |||
| * | |||
| * @param parameters Hive table properties | |||
| * @param colNameSchemaPath SchemaPath with Hive column name | |||
| * @return SchemaPath with original column name | |||
| */ | |||
| private SchemaPath replaceOverriddenSchemaPath(Map<String, String> parameters, SchemaPath colNameSchemaPath) { | |||
| String hiveColumnName = colNameSchemaPath.getRootSegmentPath(); | |||
| return hiveColumnName != null && hiveColumnName.equals(parameters.get(MAPRDB_COLUMN_ID)) | |||
| ? SchemaPath.getSimplePath(ID_KEY) : colNameSchemaPath; | |||
| } | |||
| } | |||
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