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. * * Copyright 2013 Near Infinity Corporation. */ package com.nearinfinity.honeycomb.hbase.bulkload; import com.google.common.base.Joiner; import com.google.common.collect.Lists; import com.google.common.collect.Sets; import com.nearinfinity.honeycomb.hbase.HBaseMetadata; import com.nearinfinity.honeycomb.hbase.HBaseStore; import com.nearinfinity.honeycomb.hbase.MetadataCache; import com.nearinfinity.honeycomb.hbase.MutationFactory; import com.nearinfinity.honeycomb.hbase.config.ConfigConstants; import com.nearinfinity.honeycomb.mysql.Row; import com.nearinfinity.honeycomb.mysql.schema.ColumnSchema; import com.nearinfinity.honeycomb.mysql.schema.TableSchema; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HConstants; import org.apache.hadoop.hbase.client.HTablePool; import org.apache.hadoop.hbase.client.Put; import org.apache.hadoop.hbase.io.ImmutableBytesWritable; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Mapper; import org.apache.log4j.Logger; import java.io.IOException; import java.text.ParseException; import java.util.List; import java.util.Set; import static com.google.common.base.Preconditions.checkNotNull; import static java.lang.String.format; /** * Mapper for loading large amounts of data into Honeycomb format. */ public class BulkLoadMapper extends Mapper<LongWritable, Text, ImmutableBytesWritable, Put> { static final Logger LOG = Logger.getLogger(BulkLoadMapper.class); private RowParser rowParser; private String[] columns; private long tableId; private TableSchema schema; private MutationFactory mutationFactory; private static final String SQL_TABLE = "honeycomb.sql.table"; private static final String SQL_COLUMNS = "honeycomb.sql.columns"; private static final String SEPARATOR = "importtsv.separator"; private static final String NOT_SET_ERROR = " not set. Job will fail."; @Override protected void setup(Context context) throws IOException { Configuration conf = context.getConfiguration(); char separator = conf.get(SEPARATOR, " ").charAt(0); columns = conf.getStrings(SQL_COLUMNS); String sqlTable = conf.get(SQL_TABLE); String hbaseTable = conf.get(ConfigConstants.TABLE_NAME); String columnFamily = conf.get(ConfigConstants.COLUMN_FAMILY); // Check that necessary configuration variables are set checkNotNull(conf.get(HConstants.ZOOKEEPER_QUORUM), HConstants.ZOOKEEPER_QUORUM + NOT_SET_ERROR); checkNotNull(sqlTable, SQL_TABLE + NOT_SET_ERROR); checkNotNull(columns, SQL_COLUMNS + NOT_SET_ERROR); checkNotNull(hbaseTable, ConfigConstants.TABLE_NAME + NOT_SET_ERROR); checkNotNull(columnFamily, ConfigConstants.COLUMN_FAMILY + NOT_SET_ERROR); LOG.info("Zookeeper: " + conf.get(HConstants.ZOOKEEPER_QUORUM)); LOG.info("SQL Table: " + sqlTable); LOG.info("HBase Table: " + hbaseTable); LOG.info("HBase Column Family: " + columnFamily); LOG.info("Input separator: '" + separator + "'"); final HTablePool pool = new HTablePool(conf, 1); HBaseMetadata metadata = new HBaseMetadata(new PoolHTableProvider(hbaseTable, pool)); metadata.setColumnFamily(columnFamily); HBaseStore store = new HBaseStore(metadata, null, new MetadataCache(metadata)); tableId = store.getTableId(sqlTable); schema = store.getSchema(sqlTable); mutationFactory = new MutationFactory(store); mutationFactory.setColumnFamily(columnFamily); rowParser = new RowParser(schema, columns, separator); checkSqlColumnsMatch(sqlTable); } private void checkSqlColumnsMatch(String sqlTable) { Set<String> expectedColumns = Sets.newHashSet(); for (ColumnSchema column : schema.getColumns()) { expectedColumns.add(column.getColumnName()); } List<String> invalidColumns = Lists.newLinkedList(); for (String column : columns) { if (!expectedColumns.contains(column)) { LOG.error("Found non-existent column " + column); invalidColumns.add(column); } } if (invalidColumns.size() > 0) { String expectedColumnString = Joiner.on(",").join(expectedColumns); String invalidColumnString = Joiner.on(",").join(invalidColumns); String message = String.format( "In table %s following columns (%s)" + " are not valid columns. Expected columns (%s)", sqlTable, invalidColumnString, expectedColumnString); throw new IllegalStateException(message); } } @Override public void map(LongWritable offset, Text line, Context context) { try { Row row = rowParser.parseRow(line.toString()); List<Put> puts = mutationFactory.insert(tableId, row); for (Put put : puts) { context.write(new ImmutableBytesWritable(put.getRow()), put); } context.getCounter(Counters.ROWS).increment(1); context.getCounter(Counters.PUTS).increment(puts.size()); } catch (IOException e) { LOG.error("CSVParser unable to parse line: " + line.toString(), e); context.getCounter(Counters.FAILED_ROWS).increment(1); } catch (IllegalArgumentException e) { LOG.error(format("The line %s was incorrectly formatted. Error %s", line.toString(), e.getMessage())); context.getCounter(Counters.FAILED_ROWS).increment(1); } catch (ParseException e) { LOG.error(format("Parsing failed on line %s with message %s", line.toString(), e.getMessage())); context.getCounter(Counters.FAILED_ROWS).increment(1); } catch (Exception e) { LOG.error(format("The following error %s occurred during mapping" + " for line %s", e.getMessage(), line.toString())); context.getCounter(Counters.FAILED_ROWS).increment(1); } } /** * Counters for the map / reduce job. */ public enum Counters { /** * Number of rows processed by the job */ ROWS, /** * Number of rows that failed during processing */ FAILED_ROWS, /** * Total size of the {@link Put}s generated by the job */ PUTS } }