wangxiaojing123 commented on a change in pull request #1097: KYLIN-4368 Global domain dict for MR/Hive global dict URL: https://github.com/apache/kylin/pull/1097#discussion_r374625012
########## File path: engine-mr/src/main/java/org/apache/kylin/engine/mr/steps/BuildGlobalHiveDictTotalBuildMapper.java ########## @@ -0,0 +1,231 @@ +/* + * 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.kylin.engine.mr.steps; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStreamReader; +import java.util.HashMap; +import java.util.Map; +import java.util.SortedMap; +import java.util.TreeMap; +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.FSDataInputStream; +import org.apache.hadoop.fs.FileStatus; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.io.LongWritable; +import org.apache.hadoop.io.Text; +import org.apache.hadoop.mapreduce.lib.input.FileSplit; +import org.apache.hadoop.mapreduce.lib.output.MultipleOutputs; +import org.apache.kylin.common.KylinConfig; +import org.apache.kylin.engine.mr.KylinMapper; +import org.apache.kylin.engine.mr.common.AbstractHadoopJob; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class BuildGlobalHiveDictTotalBuildMapper<KEYIN, Object> extends KylinMapper<KEYIN, Text, Text, LongWritable> { + private static final Logger logger = LoggerFactory.getLogger(BuildGlobalHiveDictTotalBuildMapper.class); + + private MultipleOutputs mos; + private Integer colIndex = null; + private String colName = null; + private Long start = 0L;//start index + private String[] cols = null; + + @Override + protected void doSetup(Context context) throws IOException, InterruptedException { + Configuration conf = context.getConfiguration(); + mos = new MultipleOutputs(context); + + KylinConfig config; + try { + config = AbstractHadoopJob.loadKylinPropsAndMetadata(); + } catch (IOException e) { + throw new RuntimeException(e); + } + cols = config.getMrHiveDictColumnsExcludeRefColumns(); + + + String statPath = conf.get("partition.statistics.path"); + + //get the input file name ,the file name format by colIndex-part-partitionNum, eg: 1-part-000019 + FileSplit fileSplit = (FileSplit) context.getInputSplit(); + String[] arr = fileSplit.getPath().getName().split("-"); + int partitionNum = Integer.parseInt(arr[2]); + colIndex = Integer.parseInt(arr[0]); + colName = cols[colIndex]; + logger.info("Input fileName:{},colIndex:{},colName:{},partitionNum:{}", fileSplit.getPath().getName(), colIndex, colName, partitionNum); + + //last max dic value per column + String lastMaxValuePath = conf.get("last.max.dic.value.path"); + logger.info("last.max.dic.value.path:"+lastMaxValuePath); + long lastMaxDictValue = this.getLastMaxDicValue(conf, lastMaxValuePath); + logger.info("last.max.dic.value.path:"+lastMaxValuePath+",value="+lastMaxDictValue); + + //Calculate the starting position of this file, the starting position of this file = sum (count) of all previous numbers + last max dic value of the column + Map<Integer, TreeMap<Integer, Long>> allStats = getPartitionsCount(conf, statPath);//<colIndex,<reduceNum,count>> + TreeMap<Integer, Long> partitionStats =allStats.get(colIndex); + if(partitionNum!=0) { + SortedMap<Integer, Long> subStat = partitionStats.subMap(0, true, partitionNum, false); + subStat.forEach((k, v)->{ + logger.info("Split num:{} and it's count:{}", k, v); + start += v; + }); + } + start += lastMaxDictValue; + logger.info("global dic.{}.split.num.{} build dict start offset is {}", colName, partitionNum, start); + } + + @Override + public void doMap(KEYIN key, Text record, Context context) throws IOException, InterruptedException { + long inkey = Long.parseLong(key.toString()); + mos.write(colIndex+"", record, new LongWritable(start + inkey), "dict_column="+colName+"/"+colIndex); + } + + @Override + protected void doCleanup(Context context) throws IOException, InterruptedException { + mos.close(); + } + + private Map<Integer, TreeMap<Integer, Long>> getPartitionsCount(Configuration conf, String partitionStatPath) throws IOException { + StringBuffer sb = new StringBuffer(); + String temp=null; + + String[] fileNameArr = null; + String[] statsArr = null; + + //colStats key is last step reduce num,value is last step that reduce item count + TreeMap<Integer, Long> colStats = null; + //allStats key is colIndex,value is colStats(that col statistics info) + Map<Integer, TreeMap<Integer, Long>> allStats = new HashMap<>(); + + Path path = new Path(partitionStatPath); + FileSystem fs = path.getFileSystem(conf); + if (fs.exists(path) && fs.isDirectory(path)) { + for (FileStatus status : fs.listStatus(path)) { + //fileNameArr[0] is globaldict colIndex + fileNameArr=status.getPath().getName().split("-"); + colStats = allStats.get(Integer.parseInt(fileNameArr[0])); + if(colStats==null){ + colStats = new TreeMap<>(); + } + temp=cat(status.getPath(), fs); + logger.info("partitionStatPath:{},content:{}", partitionStatPath, temp); + if(temp!=null){ + statsArr = temp.split("\t"); + colStats.put(Integer.parseInt(statsArr[1]), Long.parseLong(statsArr[0])); + allStats.put(Integer.parseInt(fileNameArr[0]), colStats); + } + } + } + + allStats.forEach((k, v)->{ + v.forEach((k1, v1)->{ + logger.info("allStats.colIndex:{},this split num:{},this split num's count:{}", k, k1, v1); + }); + }); + + return allStats; + } + + private String cat(Path remotePath, FileSystem fs) throws IOException { + FSDataInputStream in = null; + BufferedReader buffer = null; + StringBuffer stat= new StringBuffer(); + try { + in= fs.open(remotePath); + buffer= new BufferedReader(new InputStreamReader(in, "UTF-8")) ; + String line = null; + while ((line = buffer.readLine()) != null) { + stat.append(line); + } + } catch (IOException e) { + e.printStackTrace(); + }finally { + buffer.close(); + in.close(); Review comment: OKļ¼thanks. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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