JUC - Procesando datos con Hadoop: MapReduce y Yarn

I Jornadas Técnicas UEx - CIEMAT. Procesando grandes volúmenes de datos con Hadoop

Transcript

1. Jornadas Técnicas Uex-CIEMAT // 10-12 Febrero 2015 Procesando grandes volúmenes de datos con HADOOP César Suárez Ortega cesar.suarez@externos.ciemat.es Procesando datos con Hadoop: MapReduce y YARN
2. Software Developer / Researcher César Suárez Ortega tharandur csuarez
4. Software Engineer / Researcher César Suárez Ortega
5. Software Engineer / Researcher César Suárez Ortega
6. Índice 1. 2. 3.   4. Exprimiendo al máximo MapReduce 5.
7. Introducción a MapReduce
8. Modelo de programación para el procesamiento de datos
10. ¿Qué es MapReduce?   MUCHOS  
11. by MapReduce: Simplified Data Processing on Large Clusters. Dean J. and Ghemawat S. (2004)
12. Aprendiendo con ejemplos
13. National Climatic Data Center     
14. 1958 -0021 1959 +0065 1960
15. Soluciones 1. Script  2. Paralelización por año  3. Paralelización por partes iguales  4. MapReduce 
16. MapReduce 101   <Key, Value>  Hay que definir una función para cada etapa. MAP REDUCE
17. Map MAP <0, 005733213…> //line1 <160, 006844324…> //line2
18. Map MAP <K1, V1>
19. Map MAP <K1, V1> list(K2, V2)
20. 1958 -0021 1959 +0065 1960
21. Map MAP <0, 005733213…> //line1 <160, 006844324…> //line2 <1958, -21> <1959, +65>
22. Shuffle <1958, -21> <1959, +65> <1958, -34> <1959, +28> <1958, [-21, -34]> <1959, [+65, +28]>
23. Shuffle list(K2, V2) list(K2, list(V2))
24. Reduce REDUCE list(K2, list(V2)) list(K3, V3)
25. Reduce REDUCE <1958, [-21, -34]> <1959, [+65, +28]> <1958, -21> <1959, +65>
26. Map & Reduce REDUCE list(K2, list(V2)) list(K3, V3)) MAP <K1, V1> list(K2, V2)
27. Map&Reduce      Job   
30. Práctica 1 Mandando nuestro primer trabajo
31. MapReduce API   1. Blabla  2. BlablaMapper  3. BlablaReducer 
32. FlightsByCarrier   https://github.com/csuarez/seminario-mapreduce flights-by-carrier/
33. Year,Month,DayofMonth,DayOfWeek,DepTime,CRSDepTime,ArrTime,CRSArrTime,UniqueCarrier,FlightNum,TailNum,ActualElapsed Time,CRSElapsedTime,AirTime,ArrDelay,DepDelay,Origin,Dest,Distance,TaxiIn,TaxiOut,Cancelled,CancellationCode,Diverted,Carrie rDelay,WeatherDelay,NASDelay,SecurityDelay,LateAircraftDelay 1987,10,14,3,741,730,912,849,PS,1451,NA,91,79,NA,23,11,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,15,4,729,730,903,849,PS,1451,NA,94,79,NA,14,-1,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,17,6,741,730,918,849,PS,1451,NA,97,79,NA,29,11,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,18,7,729,730,847,849,PS,1451,NA,78,79,NA,-2,-1,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,19,1,749,730,922,849,PS,1451,NA,93,79,NA,33,19,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,21,3,728,730,848,849,PS,1451,NA,80,79,NA,-1,-2,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,22,4,728,730,852,849,PS,1451,NA,84,79,NA,3,-2,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,23,5,731,730,902,849,PS,1451,NA,91,79,NA,13,1,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,24,6,744,730,908,849,PS,1451,NA,84,79,NA,19,14,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,25,7,729,730,851,849,PS,1451,NA,82,79,NA,2,-1,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,26,1,735,730,904,849,PS,1451,NA,89,79,NA,15,5,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,28,3,741,725,919,855,PS,1451,NA,98,90,NA,24,16,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,29,4,742,725,906,855,PS,1451,NA,84,90,NA,11,17,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,31,6,726,725,848,855,PS,1451,NA,82,90,NA,-7,1,SAN,SFO,447,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,1,4,936,915,1035,1001,PS,1451,NA,59,46,NA,34,21,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,2,5,918,915,1017,1001,PS,1451,NA,59,46,NA,16,3,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,3,6,928,915,1037,1001,PS,1451,NA,69,46,NA,36,13,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,4,7,914,915,1003,1001,PS,1451,NA,49,46,NA,2,-1,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,5,1,1042,915,1129,1001,PS,1451,NA,47,46,NA,88,87,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,6,2,934,915,1024,1001,PS,1451,NA,50,46,NA,23,19,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,7,3,946,915,1037,1001,PS,1451,NA,51,46,NA,36,31,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,8,4,932,915,1033,1001,PS,1451,NA,61,46,NA,32,17,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,9,5,947,915,1036,1001,PS,1451,NA,49,46,NA,35,32,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,10,6,915,915,1022,1001,PS,1451,NA,67,46,NA,21,0,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,11,7,916,915,1006,1001,PS,1451,NA,50,46,NA,5,1,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,12,1,944,915,1027,1001,PS,1451,NA,43,46,NA,26,29,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,13,2,941,915,1036,1001,PS,1451,NA,55,46,NA,35,26,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,14,3,930,915,1029,1001,PS,1451,NA,59,46,NA,28,15,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,15,4,920,915,1023,1001,PS,1451,NA,63,46,NA,22,5,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,17,6,1009,915,1104,1001,PS,1451,NA,55,46,NA,63,54,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,18,7,915,915,1008,1001,PS,1451,NA,53,46,NA,7,0,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,19,1,940,915,1032,1001,PS,1451,NA,52,46,NA,31,25,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,21,3,913,915,1003,1001,PS,1451,NA,50,46,NA,2,-2,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA 1987,10,22,4,915,915,1017,1001,PS,1451,NA,62,46,NA,16,0,SFO,RNO,192,NA,NA,0,NA,0,NA,NA,NA,NA,NA
34. public class FlightsByCarrier { public static void main (String[] args) throws Exception { Job job = new Job(); job.setJarByClass(FlightsByCarrier.class); job.setJobName("FlightsByCarrier”); TextInputFormat.addInputPath(job, new Path(args[0])); TextOutputFormat.setOutputPath(job, new Path(args[1])); job.setInputFormatClass(TextInputFormat.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); job.setMapperClass(FlightsByCarrierMapper.class); job.setReducerClass(FlightsByCarrierReducer.class); job.setOutputFormatClass(TextOutputFormat.class); job.addFileToClassPath(new Path("/user/root/opencsv-2.3.jar")); job.waitForCompletion(true); } }
35. //Mapper<KeyIn, ValueIn, KeyOut, ValueOut> public class FlightsByCarrierMapper extends Mapper<LongWritable, Text, Text, IntWritable> { @Override protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { if (key.get() > 0) { //Ignora la primera linea String[] lines = new CSVParser().parseLine(value.toString()); context.write(new Text(lines[8]), new IntWritable(1)); } } }
36. public class FlightsByCarrierReducer extends Reducer<Text, IntWritable, Text, IntWritable> { @Override protected void reduce(Text token, Iterable<IntWritable> counts, Context context) throws IOException, InterruptedException { int sum = 0; for (IntWritable count : counts) { sum += count.get(); } context.write(token, new IntWritable(sum)); } }
37. $ git clone https://github.com/csuarez/seminario-mapreduce.git [...] $ tar xvzf 1987.tar.gz $ hdfs dfs –copyFromLocal lib/opencsv-2.3.jar /user/root $ hdfs dfs –copyFromLocal 1987.csv /user/root $ sh build.sh $ hadoop jar FlightsByCarrier.jar FlightsByCarrier /user/root/1987.csv /user/root/output/flightsCount $ hdfs dfs -cat /user/root/output/flightsCount/part-r-00000 Ejecución
38. FlightsByCarrier output INFO mapreduce.JobSubmitter: number of splits:2 ... INFO mapreduce.Job: map 0% reduce 0% INFO mapreduce.Job: map 22% reduce 0% INFO mapreduce.Job: map 41% reduce 0% INFO mapreduce.Job: map 83% reduce 0% INFO mapreduce.Job: map 100% reduce 0% INFO mapreduce.Job: map 100% reduce 100% ... Job Counters Launched map tasks=2 Launched reduce tasks=1 Rack-local map tasks=2 Total time spent by all maps in occupied slots (ms)=42442 Total time spent by all reduces in occupied slots (ms)=13465
39. MapReduce Cómo funciona
40. MapReduce v1
42. Actores 1. 2. 3. 4.
43. Ejecución MapReduce       
44. Paso 1 Job Submission    
45. Paso 2 Job Initialization     
46. Paso 3 Task Assignment    
47. Paso 4 Task Execution   
48. Paso 5 Progress & Status    
49. Paso 6 Job Completion  
50. MapReduce v2 + YARN
51. ¿Por qué YARN?     
53. YARN: Actores 1.  2.  3.  4.  5.
54. vs. MapReduce v1: Actores 1. 2. 3. 4. 1. YARN Resource Manager 2. YARN Node Manager 3. Application Master
56. MapReduce v1 API Processing FW Resource Manager Storage MR MapReduce v1 HDFS PIG HIVE HBASE
57. YARN API Processing FW Resource Manager Storage MR YARN HDFS PIG STORM MR v2 TEZ MPI
59. Paso 1 Job Submission      
61. Paso 2 Job Initialization       
62. Paso 2** Uber Mode     
64. Paso 3 Task Assignment      
66. Paso 4 Task Execution     
68. Paso 5 Progress & Status     
70. Exprimiendo MapReduce
71. Apache Pig
72. Apache Pig     
73. records = LOAD '1987.csv' USING PigStorage(',') AS (Year,Month,DayofMonth,DayOfWeek,DepTime,CRSDepTime,ArrTime,CRSArrTime,UniqueCarrier,FlightNum,Tail Num,ActualElapsedTime,CRSElapsedTime,AirTime,ArrDelay,DepDelay,Origin,Dest,Distance:int,TaxiIn,TaxiOut,Ca ncelled,CancellationCode,Diverted,CarrierDelay,WeatherDelay,NASDelay,DecurityDelay,LateAircraftDelay); milage_recs = GROUP records ALL; tot_miles = FOREACH milage_recs GENERATE SUM(records.Distance); STORE tot_miles INTO '/user/root/totalmiles'; https://github.com/csuarez/seminario-mapreduce $ cd pig-total-miles/ $ pig totalmiles.pig
74. Hadoop Streaming
75. $ hadoop jar $HADOOP_HOME/hadoop-streaming.jar \ -input myInputDirs \ -output myOutputDir \ -mapper myPythonScript.py \ -reducer /bin/wc \ -file myPythonScript.py
78. Práctica 2 MapReduce Job
79. GreekGodCounter (Estándar)   https://github.com/csuarez/seminario-mapreduce greek-god-counter-standard/
80. private final static String[] gods = { "Zeus", "Hera", "Poseidón", "Dioniso", "Apolo", "Artemisa", "Hermes", "Atenea", "Ares", "Afrodita", "Hefesto", "Deméter” };
81. //Initializing the initial structure for (String god : gods) { godMap.put(god, 0); } try { //Reading input br = new BufferedReader(new FileReader(args[0])); String line = br.readLine(); while (line != null) { StringTokenizer tokenizer = new StringTokenizer(line); while (tokenizer.hasMoreTokens()) { String token = tokenizer.nextToken(); if (godMap.containsKey(token)) { godMap.put(token, godMap.get(token) + 1); } } line = br.readLine(); } //Writing output Writer writer = new BufferedWriter(new FileWriter("gods.txt")); for (Entry<String, Integer> entry : godMap.entrySet()) { writer.write(entry.getKey() + " = " + entry.getValue()); writer.write(System.lineSeparator()); } writer.close(); }
82. ¡¡¡TAREA!!!
83. GreekGodCounter (MapReduce)   https://github.com/csuarez/seminario-mapreduce greek-god-counter-mapreduce/
84. import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.*; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.lib.input.TextInputFormat; import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; import org.apache.hadoop.filecache.DistributedCache; public class GreekGodCounterMapReduce { public static void main (String[] args) throws Exception { Job job = new Job(); job.setJarByClass(GreekGodCounterMapReduce.class); job.setJobName("GreekGodCounterMapReduce"); TextInputFormat.addInputPath(job, new Path(args[0])); job.setInputFormatClass(TextInputFormat.class); job.setMapperClass(GreekGodCounterMapReduceMapper.class); job.setReducerClass(GreekGodCounterMapReduceReducer.class); TextOutputFormat.setOutputPath(job, new Path(args[1])); job.setOutputFormatClass(TextOutputFormat.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); job.waitForCompletion(true); } }
85. import java.io.IOException; import org.apache.hadoop.io.*; import org.apache.hadoop.mapreduce.Mapper; import java.util.HashMap; import java.util.Map.Entry; import java.util.StringTokenizer; public class GreekGodCounterMapReduceMapper extends Mapper<LongWritable, Text, Text, IntWritable> { private final static String[] gods = { "Zeus", "Hera", "Poseidón", "Dioniso", "Apolo", "Artemisa", "Hermes", "Atenea", "Ares", "Afrodita", "Hefesto", "Deméter" }; @Override protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { } }
86. import java.io.IOException; import org.apache.hadoop.io.*; import org.apache.hadoop.mapreduce.Reducer; public class GreekGodCounterMapReduceReducer extends Reducer<Text, IntWritable, Text, IntWritable> { @Override protected void reduce (Text token, Iterable<IntWritable> counts, Context context) throws IOException, InterruptedException { } }
87. Recursos
88. Recursos
89. ¡Gracias! ¿Alguna pregunta? cesar.suarez@externos.ciemat.es