HAMS Technologies 1

HAMS Technologies 2 » Data size is continuously increasing due to ˃Multiple source of data ˃Easy and fast availability of data sources » R is widely known and accepted language in field of statistical analysis and prediction techniques. But performing an analysis over Big data is always a challenging task. » MapReduce is a mechanism to handle large volume of data. Hadoop is one of open source MapReduce implementation provided by Apache. » R and Hadoop can be used together with the help of a package called RHadoop.

3 HAMS Technologies Before moving further, We can take a look of MapReduce architecture and Hadoop implementation.. General flow in MapReduce architecture 1.Create a clustered network 2.Load the data into cluster using Map (mapper task) 3.Fetch the processing data with help of Map (mapper task) 4.Aggregate the result with Reducer ( Reducer task) Local Data Partial Result-1 Partial Result-2 Partial Result-3 Map Reduce Aggregated Result

4 HAMS Technologies General attributes of in MapReduce architecture 1.Distributed file system (DFS) 2.Data locality 3.Data redundancy for fault tolerance 4.Map tasks applied to partitioned data it scheduled so that input blocks are on same machine 5.Reducer tasks applied to process data partitioned by MAP task Local Data Partial Result-1 Partial Result-2 Partial Result-3 Map Reduce Aggregated Result

5 HAMS Technologies Hadoop is an open source implementation of MapReduced architecture maintained by Apache Hadoop HDFS Hadoop Distributed file system HDFS Hadoop Distributed file system MapReduce Job trackers MapReduce Job trackers name node/s Data node/s Job tracker node/s Data Node Data node/s Tracker node/s Data Node Data node/s Tracker node/s Data Node Data node/s Tracker node/s Master nodes Slave nodes Hive (Hadoop interactIVE)

» Hadoop-streaming allow to create and run MapReducde job as Mapper and/or as Reducer. » HDFS (Hadoop Distributed File System) is a clustered network used to store data. HDFS contain the script to replicate and track the different data blocks. HDFS write is show below. In same reverse manner we retrieve data from HDFS. 6 HAMS Technologies hams.txt Block-1 Block-2 Block-3 Name Node Data Node-1 Data node/s Tracker node/s Data Node-2 Data node/s Tracker node/s Data Node-3 Data node/s Tracker node/s Data Node-n Data node/s Tracker node/s I am having a file contains 3 blocks.. Where should I write these? Okey, Write these on data-node 1,2 and 3

HAMS Technologies 7 » HIVE (Hadoop InteractIVE) support high level function for handling hadoop framework like hive.start(), hive.create()...etc. » It provided functions like hive.stream() to support Hadoop-streaming » DFS functions in R like DFS.put(), DFS.list()… » To start working with HIVE ˃Download it from ˃Configure files > mapred-site.xml – to configure mapReduce >Core-site.xml – to configure basic hadoop >Hdfs-site.xml – for configuration related to HDFS

HAMS Technologies 8 » R and Hadoop : a package Rhadoop is available in R-Forge » In R prompt, ˃Hadoop package can be loaded as » Library(‘hive’); ˃To start hadoop » hive_start() ˃Put the data, list the data » DFS.put(‘source_data’, ‘/router_list’) » DFS.list(‘/router_list’);

HAMS Technologies 9 » Hive stream can be initialized as ˃hive_stream(mapper = reducer= input = output = ) » Other important functions ˃DFS_put_object() ˃DFS_cat() ˃Hive_create() ˃Hive_get_parameter()

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