jenniferdai commented on a change in pull request #4253: Add segment pre-processing Hadoop job URL: https://github.com/apache/incubator-pinot/pull/4253#discussion_r291408914
########## File path: pinot-hadoop/src/main/java/org/apache/pinot/hadoop/job/SegmentPreprocessingJob.java ########## @@ -0,0 +1,431 @@ +/** + * 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.pinot.hadoop.job; + +import com.google.common.base.Preconditions; +import java.io.IOException; +import java.util.ArrayList; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import java.util.Set; +import java.util.zip.GZIPInputStream; +import javax.annotation.Nullable; +import org.apache.avro.Schema; +import org.apache.avro.file.DataFileStream; +import org.apache.avro.generic.GenericDatumReader; +import org.apache.avro.generic.GenericRecord; +import org.apache.avro.mapred.AvroKey; +import org.apache.avro.mapred.AvroValue; +import org.apache.avro.mapreduce.AvroJob; +import org.apache.avro.mapreduce.AvroKeyOutputFormat; +import org.apache.avro.mapreduce.AvroMultipleOutputs; +import org.apache.commons.lang3.StringUtils; +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.io.NullWritable; +import org.apache.hadoop.mapred.JobContext; +import org.apache.hadoop.mapreduce.Job; +import org.apache.hadoop.mapreduce.MRJobConfig; +import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; +import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter; +import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; +import org.apache.hadoop.mapreduce.lib.output.LazyOutputFormat; +import org.apache.pinot.common.config.ColumnPartitionConfig; +import org.apache.pinot.common.config.IndexingConfig; +import org.apache.pinot.common.config.SegmentPartitionConfig; +import org.apache.pinot.common.config.TableConfig; +import org.apache.pinot.hadoop.io.CombineAvroKeyInputFormat; +import org.apache.pinot.hadoop.job.mappers.SegmentPreprocessingMapper; +import org.apache.pinot.hadoop.job.partitioners.GenericPartitioner; +import org.apache.pinot.hadoop.job.reducers.SegmentPreprocessingReducer; +import org.apache.pinot.hadoop.utils.JobPreparationHelper; +import org.apache.pinot.hadoop.utils.PushLocation; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import static org.apache.hadoop.mapreduce.MRJobConfig.*; +import static org.apache.hadoop.security.UserGroupInformation.*; +import static org.apache.pinot.hadoop.job.JobConfigConstants.*; + + +/** + * A Hadoop job which provides partitioning, sorting, and resizing against the input files, which is raw data in Avro format. + * Thus, the output files are partitioned, sorted, resized after this job. + * In order to run this job, the following configs need to be specified in job properties: + * * enable.partitioning: false by default. If enabled, this job will fetch the partition config from table config. + * * enable.sorting: false by default. If enabled, the job will fetch sorted column from table config. + * * enable.resizing: false by default. If partitioning is enabled, this is force to be disabled. If enabled, min.num.output.files is required. + * * min.num.output.files: null by default. It's required if resizing is enabled. + * * max.num.records: null by default. The output file will be split into multiple files if the number of records exceeded max.num.records. + */ +public class SegmentPreprocessingJob extends BaseSegmentJob { + private static final Logger _logger = LoggerFactory.getLogger(SegmentPreprocessingJob.class); + + private boolean _enablePartitioning = false; + private boolean _enableSorting = false; + private boolean _enableResizing = false; + + private String _partitionColumn; + private int _numberOfPartitions; + private String _partitionFunction; + private String _sortedColumn; + private int _numberOfOutputFiles; + + private final Path _inputSegmentDir; + private final Path _preprocessedOutputDir; + protected final String _rawTableName; + + // Optional. + private final Path _pathToDependencyJar; + private final String _defaultPermissionsMask; + protected final List<PushLocation> _pushLocations; + + private TableConfig _tableConfig; + protected FileSystem _fileSystem; + + public SegmentPreprocessingJob(final Properties properties) { + super(properties); + + if (_properties.getProperty(ENABLE_PARTITIONING) != null) { + _enablePartitioning = Boolean.parseBoolean(_properties.getProperty(ENABLE_PARTITIONING)); + } + + if (_properties.getProperty(ENABLE_SORTING) != null) { + _enableSorting = Boolean.parseBoolean(_properties.getProperty(ENABLE_SORTING)); + } + + if (!_enablePartitioning && _properties.getProperty(ENABLE_RESIZING) != null) { + _enableResizing = Boolean.parseBoolean(_properties.getProperty(ENABLE_RESIZING)); + } + + // get input/output paths. + _inputSegmentDir = Preconditions.checkNotNull(getPathFromProperty(PATH_TO_INPUT)); + _preprocessedOutputDir = Preconditions.checkNotNull(getPathFromProperty(PATH_TO_OUTPUT)); + _rawTableName = Preconditions.checkNotNull(_properties.getProperty(JobConfigConstants.SEGMENT_TABLE_NAME)); + + _pathToDependencyJar = getPathFromProperty(PATH_TO_DEPS_JAR); + _defaultPermissionsMask = _properties.getProperty(JobConfigConstants.DEFAULT_PERMISSIONS_MASK, null); + + // Optional push location and table parameters. If set, will use the table config and schema from the push hosts. + String pushHostsString = _properties.getProperty(JobConfigConstants.PUSH_TO_HOSTS); + String pushPortString = _properties.getProperty(JobConfigConstants.PUSH_TO_PORT); + if (pushHostsString != null && pushPortString != null) { + _pushLocations = + PushLocation.getPushLocations(StringUtils.split(pushHostsString, ','), Integer.parseInt(pushPortString)); + } else { + _pushLocations = null; + } + + _logger.info("*********************************************************************"); + _logger.info("enable.partitioning: {}", _enablePartitioning); + _logger.info("enable.sorting: {}", _enableSorting); + _logger.info("enable.resizing: {}", _enableResizing); + _logger.info("path.to.input: {}", _inputSegmentDir); + _logger.info("path.to.output: {}", _preprocessedOutputDir); + _logger.info("path.to.deps.jar: {}", _pathToDependencyJar); + _logger.info("push.locations: {}", _pushLocations); + _logger.info("*********************************************************************"); + } + + public void run() throws Exception { + if (!_enablePartitioning && !_enableSorting && !_enableResizing) { + _logger.info("Pre-processing job is disabled."); + return; + } else { + _logger.info("Starting {}", getClass().getSimpleName()); + } + + _fileSystem = FileSystem.get(_conf); + final List<Path> inputDataPath = getDataFilePaths(_inputSegmentDir); + + if (_fileSystem.exists(_preprocessedOutputDir)) { + _logger.warn("Found the output folder {}, deleting it", _preprocessedOutputDir); + _fileSystem.delete(_preprocessedOutputDir, true); + } + JobPreparationHelper.setDirPermission(_fileSystem, _preprocessedOutputDir, _defaultPermissionsMask); + + _tableConfig = getTableConfig(); + assert _tableConfig != null : "Table config shouldn't be null"; + + if (_enablePartitioning) { + fetchPartitioningConfig(); + _logger.info("{}: {}", PARTITION_COLUMN, _partitionColumn); + _logger.info("{}: {}", NUMBER_OF_PARTITIONS, _numberOfPartitions); + _logger.info("{}: {}", PARTITION_FUNCTION, _partitionColumn); + } + + if (_enableSorting) { + fetchSortingConfig(); + _logger.info("{}: {}", SORTED_COLUMN, _sortedColumn); + } + + if (_enableResizing) { + fetchResizingConfig(); + _logger.info("minimum number of output files: {}", _numberOfOutputFiles); + } + + _logger.info("Initializing a pre-processing job"); + Job job = Job.getInstance(_conf); + + job.getConfiguration().set(JobContext.JOB_NAME, this.getClass().getName()); + // Turn this on to always firstly use class paths that user specifies. + job.getConfiguration().set(MRJobConfig.MAPREDUCE_JOB_USER_CLASSPATH_FIRST, "true"); + // Turn this off since we don't need an empty file in the output directory + job.getConfiguration().set(FileOutputCommitter.SUCCESSFUL_JOB_OUTPUT_DIR_MARKER, "false"); + + job.setJarByClass(SegmentPreprocessingJob.class); + + String hadoopTokenFileLocation = System.getenv(HADOOP_TOKEN_FILE_LOCATION); + if (hadoopTokenFileLocation != null) { + job.getConfiguration().set(MAPREDUCE_JOB_CREDENTIALS_BINARY, hadoopTokenFileLocation); + } + + // Schema configs. + Schema schema = getSchema(inputDataPath.get(0)); + _logger.info("Schema is: {}", schema.toString(true)); + + // Mapper configs. + job.setMapperClass(SegmentPreprocessingMapper.class); + job.setMapOutputKeyClass(AvroKey.class); + job.setMapOutputValueClass(AvroValue.class); + job.getConfiguration().setInt(JobContext.NUM_MAPS, inputDataPath.size()); + + // Reducer configs. + job.setReducerClass(SegmentPreprocessingReducer.class); + job.setOutputKeyClass(AvroKey.class); + job.setOutputValueClass(NullWritable.class); + if (_properties.getProperty(MAXIMUM_NUMBER_OF_RECORDS) != null) { + _logger.info("Setting {} to {}", MAXIMUM_NUMBER_OF_RECORDS, _properties.getProperty(MAXIMUM_NUMBER_OF_RECORDS)); + job.getConfiguration().set(MAXIMUM_NUMBER_OF_RECORDS, _properties.getProperty(MAXIMUM_NUMBER_OF_RECORDS)); + } + AvroMultipleOutputs.addNamedOutput(job, "avro", AvroKeyOutputFormat.class, schema); + AvroMultipleOutputs.setCountersEnabled(job, true); + LazyOutputFormat.setOutputFormatClass(job, AvroKeyOutputFormat.class); Review comment: leave comment about what this does ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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