| /** |
| * 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.hcatalog.utils; |
| |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.Mapper; |
| import org.apache.hadoop.util.GenericOptionsParser; |
| import org.apache.hcatalog.common.HCatConstants; |
| import org.apache.hcatalog.data.DefaultHCatRecord; |
| import org.apache.hcatalog.data.HCatRecord; |
| import org.apache.hcatalog.data.schema.HCatSchema; |
| import org.apache.hcatalog.mapreduce.HCatInputFormat; |
| import org.apache.hcatalog.mapreduce.HCatOutputFormat; |
| import org.apache.hcatalog.mapreduce.InputJobInfo; |
| import org.apache.hcatalog.mapreduce.OutputJobInfo; |
| |
| /** |
| * This is a map reduce test for testing hcat which goes against the "numbers" |
| * table and writes data to another table. It reads data from numbers which |
| * is an unpartitioned table and adds 10 to each field. It stores the result into |
| * the datestamp='20100101' partition of the numbers_part_empty_initially table if the second |
| * command line arg is "part". If the second cmdline arg is "nopart" then the |
| * result is stored into the 'numbers_nopart_empty_initially' (unpartitioned) table. |
| * If the second cmdline arg is "nopart_pig", then the result is stored into the |
| * 'numbers_nopart_pig_empty_initially' (unpartitioned) table with the tinyint |
| * and smallint columns in "numbers" being stored as "int" (since pig cannot handle |
| * tinyint and smallint) |
| * |
| * Usage: hadoop jar storenumbers <serveruri> <part|nopart|nopart_pig> <-libjars hive-hcat jar> |
| If the second argument is "part" data is written to datestamp = '2010101' partition of the numbers_part_empty_initially table. |
| If the second argument is "nopart", data is written to the unpartitioned numbers_nopart_empty_initially table. |
| If the second argument is "nopart_pig", data is written to the unpartitioned numbers_nopart_pig_empty_initially table. |
| The hcat jar location should be specified as file://<full path to jar> |
| */ |
| public class StoreDemo { |
| |
| private static final String NUMBERS_PARTITIONED_TABLE_NAME = "demo_partitioned"; |
| private static final String NUMBERS_TABLE_NAME = "demo"; |
| |
| public static class SumMapper |
| extends Mapper<WritableComparable, HCatRecord, WritableComparable, HCatRecord> { |
| |
| |
| Integer intnum; |
| |
| Double doublenum; |
| |
| @Override |
| protected void map(WritableComparable key, HCatRecord value, |
| org.apache.hadoop.mapreduce.Mapper<WritableComparable, HCatRecord, |
| WritableComparable, HCatRecord>.Context context) |
| throws IOException, InterruptedException { |
| intnum = ((Integer) value.get(0)); |
| value.set(0, intnum + 20); |
| doublenum = ((Double) value.get(1)); |
| value.set(1, (Double) (doublenum + 20)); |
| context.write(new IntWritable(0), value); |
| |
| } |
| } |
| |
| |
| public static void main(String[] args) throws Exception { |
| Configuration conf = new Configuration(); |
| args = new GenericOptionsParser(conf, args).getRemainingArgs(); |
| String[] otherArgs = new String[1]; |
| int j = 0; |
| for (int i = 0; i < args.length; i++) { |
| if (args[i].equals("-libjars")) { |
| // generic options parser doesn't seem to work! |
| conf.set("tmpjars", args[i + 1]); |
| i = i + 1; // skip it , the for loop will skip its value |
| } else { |
| otherArgs[j++] = args[i]; |
| } |
| } |
| if (otherArgs.length != 1) { |
| usage(); |
| } |
| String serverUri = otherArgs[0]; |
| |
| String tableName = NUMBERS_TABLE_NAME; |
| String dbName = "default"; |
| Map<String, String> outputPartitionKvps = new HashMap<String, String>(); |
| String outputTableName = NUMBERS_PARTITIONED_TABLE_NAME; |
| outputPartitionKvps.put("datestamp", "20100102"); |
| |
| String principalID = System.getProperty(HCatConstants.HCAT_METASTORE_PRINCIPAL); |
| if (principalID != null) |
| conf.set(HCatConstants.HCAT_METASTORE_PRINCIPAL, principalID); |
| Job job = new Job(conf, "storedemo"); |
| // initialize HCatInputFormat |
| HCatInputFormat.setInput(job, InputJobInfo.create( |
| dbName, tableName, null)); |
| // initialize HCatOutputFormat |
| HCatOutputFormat.setOutput(job, OutputJobInfo.create( |
| dbName, outputTableName, outputPartitionKvps)); |
| // test with and without specifying schema randomly |
| HCatSchema s = HCatInputFormat.getTableSchema(job); |
| System.err.println("INFO: output schema explicitly set for writing:" + s); |
| HCatOutputFormat.setSchema(job, s); |
| |
| job.setInputFormatClass(HCatInputFormat.class); |
| job.setOutputFormatClass(HCatOutputFormat.class); |
| job.setJarByClass(StoreDemo.class); |
| job.setMapperClass(SumMapper.class); |
| job.setOutputKeyClass(IntWritable.class); |
| job.setNumReduceTasks(0); |
| job.setOutputValueClass(DefaultHCatRecord.class); |
| System.exit(job.waitForCompletion(true) ? 0 : 1); |
| } |
| |
| |
| /** |
| * |
| */ |
| private static void usage() { |
| System.err.println("Usage: hadoop jar storenumbers <serveruri> <part|nopart|nopart_pig> <-libjars hive-hcat jar>\n" + |
| "\tIf the second argument is \"part\" data is written to datestamp = '2010101' partition of " + |
| "the numbers_part_empty_initially table.\n\tIf the second argument is \"nopart\", data is written to " + |
| "the unpartitioned numbers_nopart_empty_initially table.\n\tIf the second argument is \"nopart_pig\", " + |
| "data is written to the unpartitioned numbers_nopart_pig_empty_initially table.\nt" + |
| "The hcat jar location should be specified as file://<full path to jar>\n"); |
| System.exit(2); |
| |
| } |
| |
| |
| } |