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1 Data Science Analytics & Research Centre Data Science Analytics & Research Centre 1

2 Big Data Big Data Overview Characteristics Applications & Use Case HDFS Hadoop Distributed File System (HDFS) Overview HDFS Architecture Data replication Node types Jobtracker / Tasktracker HDFS Data Flows HDFS Limitations Hadoop Hadoop Overview Inputs & Outputs Data Types What is MapReduce (MR) Example Functionalities of MR Speculative Execution Hadoop Streaming Hadoop Job Scheduling Data Science Analytics & Research Centre 2

3 Big Data Overview Characteristics Applications & Use Case Data Footprint & Time Horizon Technology Adoption Lifecycle Data Science Analytics & Research Centre 3

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7 Highly Summarized Aggregated Real Time Near Real Time Hourly Daily Weekly Analytic Marts & Cubes Monthly Quarterly Visualization & Dashboards Yearly 3 Years 5 Years 10 Years Detailed Events / Facts Core ERP & Legacy Applications & Data Warehouse Predictive Analytics Unstructured Web / Telemetry Big Data Hadoop etc. Consumption Source Real Time Daily Monthly Yearly GB TB PB Data Science Analytics & Research Centre 7

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11 Financial Services Detect fraud Model and manage risk Improve debt recovery rates Personalize banking/insurance products Healthcare Optimal treatment pathways Remote patient monitoring Predictive modeling for new drugs Personalized medicine Retail In-store behavior analysis Cross selling Optimize pricing, placement, design Optimize inventory and distribution Data Science Analytics & Research Centre 11

12 Web / Social / Mobile Location-based marketing Social segmentation Sentiment analysis Price comparison services Government Reduce fraud Segment populations, customize action Support open data initiatives Automate decision making Manufacturing Design to value Crowd-sourcing Digital factory for lean manufacturing Improve service via product sensor data Data Science Analytics & Research Centre 12

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14 Hadoop Distributed File System (HDFS) Overview HDFS Architecture Data replication Node types Jobtracker / Tasktracker HDFS Data Flows HDFS Limitations Data Science Analytics & Research Centre 14

15 Hadoop own implementation of distributed file system. Is coherent and provides all facilities of a file system. Implements ACLs and provides a subset of usual UNIX commands for accessing or querying the filesystem. It has large block size (default 64MB) 128MB recommended for storage to compensate for seek time to network bandwidth. So very large files for storage are ideal. Streaming data access. Write once and read many times architecture. Since files are large time to read is significant parameter than seek to first record. Commodity hardware. It is designed to run on commodity hardware which may fail. HDFS is capable of handling it. E.g.: 420MB file is split as: 128 MB 128 MB 128 MB 36 MB Data Science Analytics & Research Centre 15

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18 File 1 Create Complete B1 B2 B3 Namenode n1 B1 n1 B2 n1 B1 n2 B1 n2 B2 n2 B3 n3 B2 n3 B3 n3 B3 n4 n4 n4 Rack 1 Rack 2 Rack 3 Data Science Analytics & Research Centre 18

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21 HDFS Flow Read HDFS Flow Write Data Science Analytics & Research Centre 21

22 Command Usage Syntax cat Copies source paths to stdout hadoop dfs -cat URI [URI ] chgrp Change group association of files. With -R, make the change recursively through the directory structure. hadoop dfs -chgrp [-R] GROUP URI [URI ] chmod Change the permissions of files. With -R, make the change recursively through the directory structure hadoop dfs -chmod [-R] <MODE[,MODE]... OCTALMODE> URI [URI ] chown Change the owner of files. With -R, make the change recursively through the directory structure hadoop dfs -chown [-R] [OWNER][:[GROUP]] URI [URI ] copyfromlocal Similar to put command, except that the source is restricted to a local file reference. hadoop dfs -copyfromlocal <localsrc> URI Similar to get command, except that the destination hadoop dfs -copytolocal [-ignorecrc] [-crc] URI copytolocal is restricted to a local file reference. <localdst> cp Copy files from source to destination hadoop dfs -cp URI [URI ] <dest> Displays aggregate length of files contained in the du directory or the length of a file in case its just a file. hadoop dfs -du URI [URI ] dus Displays a summary of file lengths. hadoop dfs -dus <args> expunge Empty the Trash hadoop dfs -expunge get Copy files to the local file system hadoop dfs -get [-ignorecrc] [-crc] <src> <localdst> Concatenates files in source into the destination getmerge local file hadoop dfs -getmerge <src> <localdst> [addnl] File - returns stat on the file ls (or) lsr Directory - returns list of its direct children hadoop dfs -ls <args> Data Science Analytics & Research Centre 22

23 Command Usage Syntax mkdir movefromlocal Takes path uri's as argument and creates directories hadoop dfs -mkdir <paths> dfs -movefromlocal <src> <dst> mv Moves files from source to destination hadoop dfs -mv URI [URI ] <dest> put Copy single src, or multiple srcs from local file system to the destination filesystem hadoop dfs -put <localsrc>... <dst> rm (or) rmr Delete files specified as args. Only deletes non empty directory and files hadoop dfs -rm URI [URI ] setrep Changes the replication factor of a file. -R option is for recursively increasing the replication factor of files within a directory hadoop dfs -setrep [-R] <path> stat Returns the stat information on the path hadoop dfs -stat URI [URI ] tail Displays last kilobyte of the file to stdout hadoop dfs -tail [-f] URI test e - if the file exists z - if the file is zero length d - if the path is directory hadoop dfs -test -[ezd] URI text Takes a source file and outputs the file in text format hadoop dfs -text <src> touchz Create a file of zero length hadoop dfs -touchz URI [URI ] Data Science Analytics & Research Centre 23

24 Low latency data access. It is not optimized for low latency data access it trades latency to increase the throughput of the data. Lots of small files. Since block size is 64 MB and lots of small files(will waste blocks) will increase the memory requirements of namenode. Multiple writers and arbitrary modification. There is no support for multiple writers in HDFS and files are written to by a single writer after end of each file. Data Science Analytics & Research Centre 24

25 Hadoop Overview Inputs & Outputs Data Types What is MR Example Functionalities of MR Speculative Execution How Hadoop runs MR Hadoop Streaming Hadoop Job Scheduling Data Science Analytics & Research Centre 25

26 Hadoop is a framework which provides open source libraries for distributed computing using simple single map-reduce interface and its own distributed filesystem called HDFS. It facilitates scalability and takes cares of detecting and handling failures. Data Science Analytics & Research Centre 26

27 1.0.X - current stable version, 1.0 release 1.1.X - current beta version, 1.1 release 2.X.X - current alpha version 0.23.X - similar to 2.X.X but missing NN HA X - does not include security X - old legacy stable version 0.20.X - old legacy version Data Science Analytics & Research Centre 27

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29 Risk Modeling: How business/industry can better understand customers and market. Customer Churn Analysis: Why companies really loose customers. Recommendation Engine: How to predict customer preferences. Data Science Analytics & Research Centre 29

30 AD Targeting: How to increase campaign efficiency. Point of Sale Transaction Analysis: Targeting promotions to make customers buy. Predicting network Failure: Using machine-generated data to identify trouble spots. Data Science Analytics & Research Centre 30

31 Threat Analysis: Detecting threats and fraudulent analysis. Trade Surveillance: Help business spot the rogue trader. Search Quality: Delivering more relevant search results to customers. Data Science Analytics & Research Centre 31

32 Framework is introduced by google. Process vast amounts of data (multi-terabyte data-sets) in-parallel. Achieves high performance on large clusters (thousands of nodes) of commodity hardware in a reliable, fault-tolerant manner. Splits the input data-set into independent chunks. Sorts the outputs of the maps, which are then input to the reduce tasks. Takes care of scheduling tasks, monitoring them and re-executes the failed tasks. Data Science Analytics & Research Centre 32

33 The MapReduce framework operates exclusively on <key, value> pairs, that is, the framework views the input to the job as a set of <key, value> pairs and produces a set of <key, value> pairs as the output of the job, conceivably of different types. The key and value classes have to be serializable by the framework and hence need to implement the Writable interface. Additionally, the key classes have to implement the WritableComparable interface to facilitate sorting by the framework. Input and Output types of a MapReduce job: (input) <k1, v1> -> map -> <k2, v2> -> combine -> <k2, List(v2)> -> reduce -> <k3, v3> (output) Data Science Analytics & Research Centre 33

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37 Serialization is the process of turning structured objects into a byte stream for transmission over a network or for writing to persistent storage. Hadoop has writable interface supporting serialization There are following predefined implementations available for WritableComparable. 1. IntWritable 2. LongWritable 3. DoubleWritable 4. VLongWritable. Variable size, stores as much as needed. 1-9 bytes storage 5. VIntWritable. Less used! as it is pretty much represented by Vlong. 6. BooleanWritable 7. FloatWritable Data Science Analytics & Research Centre 37

38 8. BytesWritable. 9. NullWritable. 10. MD5Hash 11. ObjectWritable 12. GenericWritable Apart from the above there are four Writable Collection types 1. ArrayWritable 2. TwoDArrayWritable 3. MapWritable 4. SortedMapWritable Data Science Analytics & Research Centre 38

39 Input Data <K1, V1> <K2, V2> <K2, List(V2)> <K3, V3> Input Data Format Mapper Reducer MapperClass public void map(longwritable key, Text value, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException { String line = value.tostring(); StringTokenizer tokenizer = new StringTokenizer(line); while (tokenizer.hasmoretokens()) { word.set(tokenizer.nexttoken()); output.collect(word, one); } } ReducerClass public void reduce(text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException { int sum = 0; while (values.hasnext()) { sum += values.next().get(); } output.collect(key, new IntWritable(sum)); } } Data Science Analytics & Research Centre 39

40 $ bin/hadoop dfs -cat /usr/joe/wordcount/input/file01 Hello World Bye World $ bin/hadoop dfs -cat /usr/joe/wordcount/input/file02 Hello Hadoop Goodbye Hadoop Run the application: $ bin/hadoop jar /usr/joe/wordcount.jar org.myorg.wordcount /usr/joe/wordcount/input /usr/joe/wordcount/output Mapper implementation: Lines: The first map emits: < Hello, 1> < World, 1> < Bye, 1> < World, 1> The second map emits: < Hello, 1> < Hadoop, 1> < Goodbye, 1> < Hadoop, 1> Combiner implementation: Line: 46 Output of first map emits: < Bye, 1> < Hello, 1> < World, 2> Output of second map emits: < Goodbye, 1> < Hadoop, 2> < Hello, 1> Reducer implementation: Lines: Output of job: < Bye, 1> < Goodbye, 1> < Hadoop, 2> < Hello, 2> < World, 2> Data Science Analytics & Research Centre 40

41 A way of coping with individual Machine performance The same input can be processed multiple times in parallel, to exploit differences in machine capabilities Hadoop platform will schedule redundant copies of the remaining tasks across several nodes which do not have other work to perform Name Value Description mapred.map.tasks. speculative.execution Mapred.reduce.tasks. speculative.execution true true If true, then multiple instances of some map tasks may be executed in parallel. If true, then multiple instances of some reduce tasks may be executed in parallel. Data Science Analytics & Research Centre 41

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43 Utility that comes with the Hadoop distribution Allows you to create and run map/reduce jobs with any executable or script as the mapper and/or the reducer $HADOOP_HOME/bin/hadoop jar $HADOOP_HOME/hadoop-streaming.jar \ -input myinputdirs \ -output myoutputdir \ -mapper org.apache.hadoop.mapred.lib.identitymapper\ -reducer /bin/wc \ -jobconf mapred.reduce.tasks=2 Data Science Analytics & Research Centre 43

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45 Default Scheduler Single priority based queue of jobs. Scheduling tries to balance map and reduce load on all tasktrackers in the cluster. Capacity Scheduler Within a queue, jobs with higher priority will have access to the queue's resources before jobs with lower priority. In order to prevent one or more users from monopolizing its resources, each queue enforces a limit on the percentage of resources allocated to a user at any given time, if there is competition for them. Fair Scheduler Multiple queues (pools) of jobs sorted in FIFO or by fairness limits Each pool is guaranteed a minimum capacity and excess is shared by all jobs using a fairness algorithm. Scheduler tries to ensure that over time, all jobs receive the same number of resources. Data Science Analytics & Research Centre 45

46 Thank you!! Data Science Analytics & Research Centre Data Science Analytics & Research Centre 46

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