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Ingesting Data Ingesting Data 1 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Lesson Objectives After completing this lesson, students should be able to: ⬢ Describe data ingestion ⬢ Describe Batch/Bulk ingestion options – Ambari HDFS Files View – CLI & WebHDFS – NFS Gateway – Sqoop ⬢ Describe streaming framework alternatives – Flume – Storm – Spark Streaming – HDF / NiFi 2 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ingestion Overview Batch/Bulk Ingestion Streaming Alternatives 3 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Data Input Options nfs gateway MapReduce hdfs dfs -put WebHDFS HDFS APIs Vendor Connectors 4 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Real-Time Versus Batch Ingestion Workflows Real-time and batch processing are very different. Factors Real-Time Batch Age Real-time – usually less than 15 Historical – usually more than minutes old 15 minutes old Data Location Primarily in memory – moved Primarily on disk – moved to to disk after processing memory for processing Speed Sub-second to few seconds Few seconds to hours Processing Frequency Always running Sporadic to periodic Who Automated systems only Human & automated systems Clients Type Primarily operational Primarily analytical applications applications 5 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ingestion Overview Batch/Bulk Ingestion Streaming Alternatives 6 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Create a directory 7 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Upload a file. 8 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Rename directory. 9 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Go up one directory. 10 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Delete to Trash or permanently. 11 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Move to another directory. 12 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Go to directory. 13 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ambari Files View The Files View is an Ambari Web UI plug-in providing a graphical interface to HDFS. Download to local system. 14 © Hortonworks Inc. 2011 – 2018. All Rights Reserved The Hadoop Client ⬢ The put command to uploading data to HDFS ⬢ Perfect for inputting local files into HDFS ⬢ Useful in batch scripts ⬢ Usage: hdfs dfs –put mylocalfile /some/hdfs/path 15 © Hortonworks Inc. 2011 – 2018. All Rights Reserved WebHDFS ⬢ REST API for accessing all of the HDFS file system interfaces: – http://host:port/webhdfs/v1/test/mydata.txt?op=OPEN – http://host:port/webhdfs/v1/user/train/data?op=MKDIRS – http://host:port/webhdfs/v1/test/mydata.txt?op=APPEND 16 © Hortonworks Inc. 2011 – 2018. All Rights Reserved NFS Gateway ⬢ Uses NFS standard and supports all HDFS commands ⬢ No random writes File writes DN by DataTransferProtocol app user NFS NFS NFSv3 ClientProtocol Gate NN Client way DFSClient DataTransferProtocol DN 17 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Sqoop: Database Import/Export Relational Enterprise Document-based Database Data Warehouse Systems 1. Client executes a sqoop 3. Plugins provide connectivity to various command data sources 2. Sqoop executes the Map Hadoop command as a MapReduce job tasks Cluster on the cluster (using Map-only tasks) 18 © Hortonworks Inc. 2011 – 2018. All Rights Reserved The Sqoop Import Tool The import command has the following requirements: ⬢ Must specify a connect string using the --connect argument ⬢ Credentials can be included in the connect string, so use the --username and --password arguments ⬢ Must specify either a table to import using --table or the result of an SQL query using --query 19 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Importing a Table sqoop import --connect jdbc:mysql://host/nyse --table StockPrices --target-dir /data/stockprice/ --as-textfile 20 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Importing Specific Columns sqoop import --connect jdbc:mysql://host/nyse --table StockPrices --columns StockSymbol,Volume, High,ClosingPrice --target-dir /data/dailyhighs/ --as-textfile --split-by StockSymbol -m 10 21 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Importing from a Query sqoop import --connect jdbc:mysql://host/nyse --query "SELECT * FROM StockPrices s WHERE s.Volume >= 1000000 AND \$CONDITIONS" --target-dir /data/highvolume/ --as-textfile --split-by StockSymbol 22 © Hortonworks Inc. 2011 – 2018. All Rights Reserved The Sqoop Export Tool ⬢ The export command transfers data from HDFS to a database: – Use --table to specify the database table – Use --export-dir to specify the data to export ⬢ Rows are appended to the table by default ⬢ If you define --update-key, existing rows will be updated with the new data ⬢ Use --call to invoke a stored procedure (instead of specifying the --table argument) 23 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Exporting to a Table sqoop export --connect jdbc:mysql://host/mylogs --table LogData --export-dir /data/logfiles/ --input-fields-terminated-by "\t" 24 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Ingestion Overview Batch/Bulk Ingestion Streaming Alternatives 25 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Flume: Data Streaming Channel Log Data Event Data Social Media Source Sink etc... Flume Agent Flume uses a Channel between the A background process Source and Sink to decouple the processing of events from the storing of events. Hadoop cluster 26 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Storm Topology Overview ⬢ Storm data processing occurs in a bolt topology. stream ⬢ A topology consists of spout and bolt bolt components. stream stream spout stream bolt ⬢ Spouts bring data into the topology stream ⬢ Bolts can (not required) persist data including to HDFS bolt spout stream Storm topology 27 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Message Queues Various types of message queues are often the source of the data processed by real-time processing engines like Storm real-time message Storm data source queue operating systems, log entries, events, Kestrel, RabbitMQ, services and data from queue is errors, status AMQP, Kafka, JMS, applications, read by Storm messages, etc. others… sensors 28 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Spark Streaming ⬢Streaming Applications consist of the same components as a Core application, but add the concept of a receiver ⬢The receiver is a process running on an executor Dstream Streaming Data Receiver Dstream Spark Core Outpu t Dstream Spark Streaming 29 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Spark Streaming’s Micro-Batch Approach ⬢ Micro-batches are created at regular time intervals – Receiver takes the data and starts filling up a batch – After the batch duration completes, data is shipped off – Each batch forms a collection of data entities that are processed together 30 © Hortonworks Inc. 2011 – 2018. All Rights Reserved HDF with HDP – A Complete Big Data Solution Perishable Hortonworks DataFlow Insights (HDF) powered by Apache NiFi Store Data Enrich and Metadata Context Internet of Anything Hortonworks Data Platform (HDP) powered by Apache Hadoop Historical Hortonworks Data Platform Insights powered by Apache Hadoop Hortonworks DataFlow and the Hortonworks Data Platform deliver the industry’s most complete Big Data solution 31 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Big Data Ingestion with HDF HDF workflows and Storm/Spark streaming workflows can be coupled Hadoop Raw Network Stream Network Metadata Stream Storm Spark Kafka Data Stores HDF Syslog HBase Hive SOLR Phoenix Raw Application Logs YARN Other Streaming Telemetry HDFS 32 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Knowledge Check 33 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Questions 1. What tool is used for importing data from a RDBMS? 34 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Questions 1. What tool is used for importing data from a RDBMS? 2. List two ways to easily script moving files into HDFS. 35 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Questions 1. What tool is used for importing data from a RDBMS? 2. List two ways to easily script moving files into HDFS. 3. True/False? Storm operates on micro-batches. 36 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Questions 1. What tool is used for importing data from a RDBMS? 2. List two ways to easily script moving files into HDFS. 3. True/False? Storm operates on micro-batches. 4. Name the popular open-source messaging component that is bundled with HDP. 37 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Summary 38 © Hortonworks Inc. 2011 – 2018. All Rights Reserved Summary ⬢ There are many different ways to ingest data including customer solutions written via HDFS APIs as well as vendor connectors ⬢ Streaming and batch workflows can work together in a holistic system ⬢ The NFS Gateway may help some legacy systems populate data into HDFS ⬢ Sqoop’s configurable number of database connection can overload an RDBMS ⬢ The following are streaming frameworks: – Flume – Storm – Spark Streaming – HDF / NiFi 39 © Hortonworks Inc. 2011 – 2018. All Rights Reserved.
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