| /** |
| * |
| * 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.hadoop.hbase.mapreduce; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Locale; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.KeyValue; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.classification.InterfaceStability; |
| import org.apache.hadoop.hbase.client.Connection; |
| import org.apache.hadoop.hbase.client.ConnectionFactory; |
| import org.apache.hadoop.hbase.client.RegionLocator; |
| import org.apache.hadoop.hbase.client.Scan; |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.hbase.util.Pair; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.util.StringUtils; |
| |
| /** |
| * Convert HBase tabular data into a format that is consumable by Map/Reduce. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class TableInputFormat extends TableInputFormatBase |
| implements Configurable { |
| |
| @SuppressWarnings("hiding") |
| private static final Log LOG = LogFactory.getLog(TableInputFormat.class); |
| |
| /** Job parameter that specifies the input table. */ |
| public static final String INPUT_TABLE = "hbase.mapreduce.inputtable"; |
| /** |
| * If specified, use start keys of this table to split. |
| * This is useful when you are preparing data for bulkload. |
| */ |
| private static final String SPLIT_TABLE = "hbase.mapreduce.splittable"; |
| /** Base-64 encoded scanner. All other SCAN_ confs are ignored if this is specified. |
| * See {@link TableMapReduceUtil#convertScanToString(Scan)} for more details. |
| */ |
| public static final String SCAN = "hbase.mapreduce.scan"; |
| /** Scan start row */ |
| public static final String SCAN_ROW_START = "hbase.mapreduce.scan.row.start"; |
| /** Scan stop row */ |
| public static final String SCAN_ROW_STOP = "hbase.mapreduce.scan.row.stop"; |
| /** Column Family to Scan */ |
| public static final String SCAN_COLUMN_FAMILY = "hbase.mapreduce.scan.column.family"; |
| /** Space delimited list of columns and column families to scan. */ |
| public static final String SCAN_COLUMNS = "hbase.mapreduce.scan.columns"; |
| /** The timestamp used to filter columns with a specific timestamp. */ |
| public static final String SCAN_TIMESTAMP = "hbase.mapreduce.scan.timestamp"; |
| /** The starting timestamp used to filter columns with a specific range of versions. */ |
| public static final String SCAN_TIMERANGE_START = "hbase.mapreduce.scan.timerange.start"; |
| /** The ending timestamp used to filter columns with a specific range of versions. */ |
| public static final String SCAN_TIMERANGE_END = "hbase.mapreduce.scan.timerange.end"; |
| /** The maximum number of version to return. */ |
| public static final String SCAN_MAXVERSIONS = "hbase.mapreduce.scan.maxversions"; |
| /** Set to false to disable server-side caching of blocks for this scan. */ |
| public static final String SCAN_CACHEBLOCKS = "hbase.mapreduce.scan.cacheblocks"; |
| /** The number of rows for caching that will be passed to scanners. */ |
| public static final String SCAN_CACHEDROWS = "hbase.mapreduce.scan.cachedrows"; |
| /** Set the maximum number of values to return for each call to next(). */ |
| public static final String SCAN_BATCHSIZE = "hbase.mapreduce.scan.batchsize"; |
| /** Specify if we have to shuffle the map tasks. */ |
| public static final String SHUFFLE_MAPS = "hbase.mapreduce.inputtable.shufflemaps"; |
| |
| /** The configuration. */ |
| private Configuration conf = null; |
| |
| /** |
| * Returns the current configuration. |
| * |
| * @return The current configuration. |
| * @see org.apache.hadoop.conf.Configurable#getConf() |
| */ |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| /** |
| * Sets the configuration. This is used to set the details for the table to |
| * be scanned. |
| * |
| * @param configuration The configuration to set. |
| * @see org.apache.hadoop.conf.Configurable#setConf( |
| * org.apache.hadoop.conf.Configuration) |
| */ |
| @Override |
| @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="REC_CATCH_EXCEPTION", |
| justification="Intentional") |
| public void setConf(Configuration configuration) { |
| this.conf = configuration; |
| |
| Scan scan = null; |
| |
| if (conf.get(SCAN) != null) { |
| try { |
| scan = TableMapReduceUtil.convertStringToScan(conf.get(SCAN)); |
| } catch (IOException e) { |
| LOG.error("An error occurred.", e); |
| } |
| } else { |
| try { |
| scan = createScanFromConfiguration(conf); |
| } catch (Exception e) { |
| LOG.error(StringUtils.stringifyException(e)); |
| } |
| } |
| |
| setScan(scan); |
| } |
| |
| /** |
| * Sets up a {@link Scan} instance, applying settings from the configuration property |
| * constants defined in {@code TableInputFormat}. This allows specifying things such as: |
| * <ul> |
| * <li>start and stop rows</li> |
| * <li>column qualifiers or families</li> |
| * <li>timestamps or timerange</li> |
| * <li>scanner caching and batch size</li> |
| * </ul> |
| */ |
| public static Scan createScanFromConfiguration(Configuration conf) throws IOException { |
| Scan scan = new Scan(); |
| |
| if (conf.get(SCAN_ROW_START) != null) { |
| scan.setStartRow(Bytes.toBytesBinary(conf.get(SCAN_ROW_START))); |
| } |
| |
| if (conf.get(SCAN_ROW_STOP) != null) { |
| scan.setStopRow(Bytes.toBytesBinary(conf.get(SCAN_ROW_STOP))); |
| } |
| |
| if (conf.get(SCAN_COLUMNS) != null) { |
| addColumns(scan, conf.get(SCAN_COLUMNS)); |
| } |
| |
| if (conf.get(SCAN_COLUMN_FAMILY) != null) { |
| scan.addFamily(Bytes.toBytes(conf.get(SCAN_COLUMN_FAMILY))); |
| } |
| |
| if (conf.get(SCAN_TIMESTAMP) != null) { |
| scan.setTimeStamp(Long.parseLong(conf.get(SCAN_TIMESTAMP))); |
| } |
| |
| if (conf.get(SCAN_TIMERANGE_START) != null && conf.get(SCAN_TIMERANGE_END) != null) { |
| scan.setTimeRange( |
| Long.parseLong(conf.get(SCAN_TIMERANGE_START)), |
| Long.parseLong(conf.get(SCAN_TIMERANGE_END))); |
| } |
| |
| if (conf.get(SCAN_MAXVERSIONS) != null) { |
| scan.setMaxVersions(Integer.parseInt(conf.get(SCAN_MAXVERSIONS))); |
| } |
| |
| if (conf.get(SCAN_CACHEDROWS) != null) { |
| scan.setCaching(Integer.parseInt(conf.get(SCAN_CACHEDROWS))); |
| } |
| |
| if (conf.get(SCAN_BATCHSIZE) != null) { |
| scan.setBatch(Integer.parseInt(conf.get(SCAN_BATCHSIZE))); |
| } |
| |
| // false by default, full table scans generate too much BC churn |
| scan.setCacheBlocks((conf.getBoolean(SCAN_CACHEBLOCKS, false))); |
| |
| return scan; |
| } |
| |
| @Override |
| protected void initialize(JobContext context) throws IOException { |
| // Do we have to worry about mis-matches between the Configuration from setConf and the one |
| // in this context? |
| TableName tableName = TableName.valueOf(conf.get(INPUT_TABLE)); |
| try { |
| initializeTable(ConnectionFactory.createConnection(new Configuration(conf)), tableName); |
| } catch (Exception e) { |
| LOG.error(StringUtils.stringifyException(e)); |
| } |
| } |
| |
| /** |
| * Parses a combined family and qualifier and adds either both or just the |
| * family in case there is no qualifier. This assumes the older colon |
| * divided notation, e.g. "family:qualifier". |
| * |
| * @param scan The Scan to update. |
| * @param familyAndQualifier family and qualifier |
| * @throws IllegalArgumentException When familyAndQualifier is invalid. |
| */ |
| private static void addColumn(Scan scan, byte[] familyAndQualifier) { |
| byte [][] fq = KeyValue.parseColumn(familyAndQualifier); |
| if (fq.length == 1) { |
| scan.addFamily(fq[0]); |
| } else if (fq.length == 2) { |
| scan.addColumn(fq[0], fq[1]); |
| } else { |
| throw new IllegalArgumentException("Invalid familyAndQualifier provided."); |
| } |
| } |
| |
| /** |
| * Adds an array of columns specified using old format, family:qualifier. |
| * <p> |
| * Overrides previous calls to {@link Scan#addColumn(byte[], byte[])}for any families in the |
| * input. |
| * |
| * @param scan The Scan to update. |
| * @param columns array of columns, formatted as <code>family:qualifier</code> |
| * @see Scan#addColumn(byte[], byte[]) |
| */ |
| public static void addColumns(Scan scan, byte [][] columns) { |
| for (byte[] column : columns) { |
| addColumn(scan, column); |
| } |
| } |
| |
| /** |
| * Calculates the splits that will serve as input for the map tasks. The |
| * number of splits matches the number of regions in a table. Splits are shuffled if |
| * required. |
| * @param context The current job context. |
| * @return The list of input splits. |
| * @throws IOException When creating the list of splits fails. |
| * @see org.apache.hadoop.mapreduce.InputFormat#getSplits( |
| * org.apache.hadoop.mapreduce.JobContext) |
| */ |
| @Override |
| public List<InputSplit> getSplits(JobContext context) throws IOException { |
| List<InputSplit> splits = super.getSplits(context); |
| if ((conf.get(SHUFFLE_MAPS) != null) && "true".equals(conf.get(SHUFFLE_MAPS).toLowerCase(Locale.ROOT))) { |
| Collections.shuffle(splits); |
| } |
| return splits; |
| } |
| |
| /** |
| * Convenience method to parse a string representation of an array of column specifiers. |
| * |
| * @param scan The Scan to update. |
| * @param columns The columns to parse. |
| */ |
| private static void addColumns(Scan scan, String columns) { |
| String[] cols = columns.split(" "); |
| for (String col : cols) { |
| addColumn(scan, Bytes.toBytes(col)); |
| } |
| } |
| |
| @Override |
| protected Pair<byte[][], byte[][]> getStartEndKeys() throws IOException { |
| if (conf.get(SPLIT_TABLE) != null) { |
| TableName splitTableName = TableName.valueOf(conf.get(SPLIT_TABLE)); |
| try (Connection conn = ConnectionFactory.createConnection(getConf())) { |
| try (RegionLocator rl = conn.getRegionLocator(splitTableName)) { |
| return rl.getStartEndKeys(); |
| } |
| } |
| } |
| |
| return super.getStartEndKeys(); |
| } |
| |
| /** |
| * Sets split table in map-reduce job. |
| */ |
| public static void configureSplitTable(Job job, TableName tableName) { |
| job.getConfiguration().set(SPLIT_TABLE, tableName.getNameAsString()); |
| } |
| } |