Introduction to Big Data
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Big data is characterized by 3Vs - volume, velocity, and variety. Hadoop is a framework for distributed processing of large datasets across clusters of computers. It provides HDFS for storage, MapReduce for batch processing, and YARN for resource management. Additional tools like Spark, Mahout, and Zeppelin can be used for real-time processing, machine learning, and data visualization respectively on Hadoop. Benefits of Hadoop include ease of scaling to large data, high performance via parallel processing, reliability through data protection and failover.
Introduction to Big Data
- 2. Definition Big data can defined by 3Vs (Three Vs): – Volume, starts as low as 1 terabyte and it has no upper limit. – Velocity, data volume per unit time, should be at least 30KB/sec. – Variety, add unstructured & semi-structured to structured data.
- 3. Volume Big data is composed of huge numbers of very small transactions that come in variety formats. Data produce true value only after they’re aggregated and analyzed.
- 4. Velocity Required latency less than 100ms, measured from the time data is created to time has the responds. Throughput requirement can easily be as high as 1,000 messages per second.
- 5. Variety Composing of a combination of datasets with differing underlying structures (structured, semi-structured, or structured). Heterogeneous format: graphics, JSON, XML, CSV, and log files.
- 6. Idetifying by the Sources Data nowadays generated by: • Humans • Machine • Sensors Typical sources: • Social media • Financial transactions • Health records • Click streams • Log files • Internet of Things
- 7. Problem ■ Managing volume of data, caused by overloading volume ■ Maintaining system performance, caused by low velocity of data access ■ Avoiding disjunction of data, caused by variety of data structure and formats. How to accomplish those?
- 8. Managing Volume Scalable database, use NoSQL DBMS (MongoDB, Cassandra DB, Titan DB)
- 9. Maintaining Performance ■ For Batch Processing, use Hadoop MapReduce ■ For Stream Processing, use Apache Spark, Apache Storm, Apache Drill
- 10. Avoiding Disjunction ■ Use Flat Storage Architecture / Data Lake, to hold huge volumes of multi-structured data. ■ Use Hadoop Distributed File System (HDFS), to deploy to the machine.
- 12. What is Hadoop? A framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models.
- 13. Why Hadoop? ■ Most proven framework in industry nowadays ■ Open Source ■ Rich features & functionalities ■ Rich support plugins in the ecosystem => (https://hadoopecosystemtable.github.io/)
- 14. When to use Hadoop? ■ For processing large volumes of data ■ For parallel data processing ■ For storing a diverse set of data
- 15. When not to use Hadoop? ■ For a relational database system ■ For a general network network file system ■ For non-parallel data processing
- 16. Core Functions ■ Data Storage ■ Data Processing ■ Resource Management
- 17. Data Storage Hadoop use HDFS (Hadoop Distributed File System) to store the data. HDFS is a distributed file system designed to fault tolerant and deployed on low-cost hardware
- 18. HDFS’ Goals ■ Hardware Failure, detection of faults and quick automatic recovery. ■ Streaming Data Access, emphasis on high throughput of data access. ■ Large Data Sets, provide high aggregate data bandwidth and scale to hundreds of nodes in a single cluster and support tens of millions of files in a single instance. ■ Simple Coherency Model, HDFS applications need a write-once-read-many access model for files. ■ Portability, designed to be easily move from one platform to another.
- 19. Data Processing Data processing has two ways, batch and real-time. ■ Batch processing, execution of a series of jobs. – Use Hadoop MapReduce ■ Real-time processing, execution of instantaneously jobs. – Use Apache Spark
- 20. Hadoop MapReduce • MapReduce is a parallel distributed processing that can be used to process large of data in batch to transform it into manageable-size data. • This work is done in two steps: 1. Map the Data, this stage is to delegate the data into key-value pairs & divided into fragments, then assigned to map tasks. 2. Reduce the Data, this stage is the combination of the Shuffle stage and the Reduce stage, the goals of this stage is to process the data result of map tasks, then produce a new set of output which will stored in the HDFS.
- 22. Resource Management Manage all resources in the Hadoop cluster, to monitor if there are any faults, job scheduling, and do quick automatic recovery. Hadoop use YARN.
- 23. Hadoop YARN • The ResourceManager is the ultimate authority that arbitrates resources among all the applications in the system (cluster). • The NodeManager is the per-machine framework agent who is responsible for containers, monitoring their resource usage (cpu, memory, disk, network) and reporting the same to the ResourceManager
- 24. YARN (cot’d) ■ The Scheduler is responsible for allocating resources to the various running applications subject to familiar constraints of capacities, queues, etc. – Performs no monitoring or tracking of status for the application – No guarantees about restarting failed tasks either due to application failure or hardware failures – Performs its scheduling function based on the resource requirements of the applications
- 25. Analyzing Data Process of inspecting, cleansing, transforming, and modeling data with the goal of discovering useful information, suggesting conclusions, and supporting decision- making. The goal of analyzing data is to leverage your business to grow more higher. Hadoop support this activity with the help from Apache Mahout.
- 26. Apache Mahout Library that help creates a machine learning applications. The main functions is to help solve: 1. Classification, assigning a set of data to known category. 2. Clustering, grouping a set of objects based on the similarity. 3. Recommendations, give list of recommendation based on statistic analyzing. Mahout provides the algorithm to solve all problem above and allow to customized them on demand.
- 27. Visualization Hadoop by default doesn’t support to visualize the data. To visualize the data, use Apache Zeppelin (http://zeppelin.apache.org/).
- 29. Benefits Hadoop give some benefits: ■ Ease of scaling Hadoop is designed as a distributed system ■ Performance Hadoop is designed to works in distributed & parallel processing ■ Availability & Reliability Hadoop platform is providing data protection and automatic failover configuration
- 30. Conclusion ■ Big data is not a barrier, but only a data that need to be managed properly. ■ Used a proper tools to managed them. ■ Prepare the strategy to processing the data (batch or stream). ■ Managed & maintain the system carefully. ■ Use plugins that needed by functional requirements. ■ Grow your business with Data-Driven Approach
- 31. FIN
Editor's Notes
- RDBMS could scale on read operation, but in write operation you need to drop ACID requirements which is violated RDBMS core rules.
- It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-availability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-available service on top of a cluster of computers, each of which may be prone to failures.
- Batch: “where data is collected and then processed as one unit with processing completion times on the order of hours or days”