Java tutorial
/* * 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.store.hive; import com.fasterxml.jackson.annotation.JacksonInject; import com.fasterxml.jackson.annotation.JsonCreator; import com.fasterxml.jackson.annotation.JsonProperty; import com.fasterxml.jackson.annotation.JsonTypeName; import org.apache.drill.exec.store.parquet.ParquetReaderConfig; import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; import org.apache.drill.common.exceptions.ExecutionSetupException; import org.apache.drill.common.expression.LogicalExpression; import org.apache.drill.common.expression.SchemaPath; import org.apache.drill.common.expression.ValueExpressions; import org.apache.drill.exec.physical.base.GroupScan; import org.apache.drill.exec.physical.base.PhysicalOperator; import org.apache.drill.exec.physical.base.SubScan; import org.apache.drill.exec.proto.CoordinationProtos; import org.apache.drill.exec.store.StoragePluginRegistry; import org.apache.drill.exec.store.dfs.FileSelection; import org.apache.drill.exec.store.dfs.ReadEntryWithPath; import org.apache.drill.exec.store.hive.HiveMetadataProvider.LogicalInputSplit; import org.apache.drill.exec.store.parquet.AbstractParquetGroupScan; import org.apache.drill.exec.store.parquet.RowGroupReadEntry; import org.apache.drill.exec.store.parquet.metadata.Metadata; import org.apache.drill.exec.store.parquet.RowGroupInfo; import org.apache.drill.exec.util.ImpersonationUtil; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileStatus; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.hive.metastore.api.Partition; import org.apache.hadoop.hive.ql.io.parquet.ProjectionPusher; import org.apache.hadoop.mapred.FileSplit; import org.apache.hadoop.mapred.InputSplit; import org.apache.hadoop.mapred.JobConf; import java.io.IOException; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; @JsonTypeName("hive-drill-native-parquet-scan") public class HiveDrillNativeParquetScan extends AbstractParquetGroupScan { private final HiveStoragePlugin hiveStoragePlugin; private final HivePartitionHolder hivePartitionHolder; private final Map<String, String> confProperties; @JsonCreator public HiveDrillNativeParquetScan(@JacksonInject StoragePluginRegistry engineRegistry, @JsonProperty("userName") String userName, @JsonProperty("hiveStoragePluginConfig") HiveStoragePluginConfig hiveStoragePluginConfig, @JsonProperty("columns") List<SchemaPath> columns, @JsonProperty("entries") List<ReadEntryWithPath> entries, @JsonProperty("hivePartitionHolder") HivePartitionHolder hivePartitionHolder, @JsonProperty("confProperties") Map<String, String> confProperties, @JsonProperty("readerConfig") ParquetReaderConfig readerConfig, @JsonProperty("filter") LogicalExpression filter) throws IOException, ExecutionSetupException { super(ImpersonationUtil.resolveUserName(userName), columns, entries, readerConfig, filter); this.hiveStoragePlugin = (HiveStoragePlugin) engineRegistry.getPlugin(hiveStoragePluginConfig); this.hivePartitionHolder = hivePartitionHolder; this.confProperties = confProperties; init(); } public HiveDrillNativeParquetScan(String userName, List<SchemaPath> columns, HiveStoragePlugin hiveStoragePlugin, List<LogicalInputSplit> logicalInputSplits, Map<String, String> confProperties, ParquetReaderConfig readerConfig) throws IOException { this(userName, columns, hiveStoragePlugin, logicalInputSplits, confProperties, readerConfig, ValueExpressions.BooleanExpression.TRUE); } public HiveDrillNativeParquetScan(String userName, List<SchemaPath> columns, HiveStoragePlugin hiveStoragePlugin, List<LogicalInputSplit> logicalInputSplits, Map<String, String> confProperties, ParquetReaderConfig readerConfig, LogicalExpression filter) throws IOException { super(userName, columns, new ArrayList<>(), readerConfig, filter); this.hiveStoragePlugin = hiveStoragePlugin; this.hivePartitionHolder = new HivePartitionHolder(); this.confProperties = confProperties; for (LogicalInputSplit logicalInputSplit : logicalInputSplits) { Iterator<InputSplit> iterator = logicalInputSplit.getInputSplits().iterator(); // logical input split contains list of splits by files // we need to read path of only one to get file path assert iterator.hasNext(); InputSplit split = iterator.next(); assert split instanceof FileSplit; FileSplit fileSplit = (FileSplit) split; Path finalPath = fileSplit.getPath(); Path pathString = Path.getPathWithoutSchemeAndAuthority(finalPath); entries.add(new ReadEntryWithPath(pathString)); // store partition values per path Partition partition = logicalInputSplit.getPartition(); if (partition != null) { hivePartitionHolder.add(pathString, partition.getValues()); } } init(); } private HiveDrillNativeParquetScan(HiveDrillNativeParquetScan that) { super(that); this.hiveStoragePlugin = that.hiveStoragePlugin; this.hivePartitionHolder = that.hivePartitionHolder; this.confProperties = that.confProperties; } @JsonProperty public HiveStoragePluginConfig getHiveStoragePluginConfig() { return hiveStoragePlugin.getConfig(); } @JsonProperty public HivePartitionHolder getHivePartitionHolder() { return hivePartitionHolder; } @JsonProperty public Map<String, String> getConfProperties() { return confProperties; } @Override public SubScan getSpecificScan(int minorFragmentId) { List<RowGroupReadEntry> readEntries = getReadEntries(minorFragmentId); HivePartitionHolder subPartitionHolder = new HivePartitionHolder(); for (RowGroupReadEntry readEntry : readEntries) { List<String> values = hivePartitionHolder.get(readEntry.getPath()); subPartitionHolder.add(readEntry.getPath(), values); } return new HiveDrillNativeParquetRowGroupScan(getUserName(), hiveStoragePlugin, readEntries, columns, subPartitionHolder, confProperties, readerConfig, filter); } @Override public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) { Preconditions.checkArgument(children.isEmpty()); return new HiveDrillNativeParquetScan(this); } @Override public HiveDrillNativeParquetScan clone(FileSelection selection) throws IOException { HiveDrillNativeParquetScan newScan = new HiveDrillNativeParquetScan(this); newScan.modifyFileSelection(selection); newScan.init(); return newScan; } @Override public GroupScan clone(List<SchemaPath> columns) { HiveDrillNativeParquetScan newScan = new HiveDrillNativeParquetScan(this); newScan.columns = columns; return newScan; } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append("HiveDrillNativeParquetScan ["); builder.append("entries=").append(entries); builder.append(", numFiles=").append(getEntries().size()); builder.append(", numRowGroups=").append(rowGroupInfos.size()); String filterString = getFilterString(); if (!filterString.isEmpty()) { builder.append(", filter=").append(filterString); } builder.append(", columns=").append(columns); builder.append("]"); return builder.toString(); } @Override protected void initInternal() throws IOException { Map<FileStatus, FileSystem> fileStatusConfMap = new LinkedHashMap<>(); for (ReadEntryWithPath entry : entries) { Path path = entry.getPath(); Configuration conf = new ProjectionPusher() .pushProjectionsAndFilters(new JobConf(hiveStoragePlugin.getHiveConf()), path.getParent()); FileSystem fs = path.getFileSystem(conf); fileStatusConfMap.put(fs.getFileStatus(Path.getPathWithoutSchemeAndAuthority(path)), fs); } parquetTableMetadata = Metadata.getParquetTableMetadata(fileStatusConfMap, readerConfig); } @Override protected Collection<CoordinationProtos.DrillbitEndpoint> getDrillbits() { return hiveStoragePlugin.getContext().getBits(); } @Override protected AbstractParquetGroupScan cloneWithFileSelection(Collection<Path> filePaths) throws IOException { FileSelection newSelection = new FileSelection(null, new ArrayList<>(filePaths), null, null, false); return clone(newSelection); } @Override protected boolean supportsFileImplicitColumns() { return false; } @Override protected List<String> getPartitionValues(RowGroupInfo rowGroupInfo) { return hivePartitionHolder.get(rowGroupInfo.getPath()); } }