Department of Computer Science University of Cyprus EPL646 Advanced Topics in Databases. Lecture 14
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1 Department of Computer Science University of Cyprus EPL646 Advanced Topics in Databases Lecture 14 Big Data Management IV: Big-data Infrastructures (Background, IO, From NFS to HFDS) Chapter 14-15: Abideboul et. Al. Demetris Zeinalipour
2 Lecture Outline Introduction to Cloud Computing Typical Datacenters, Cloud Stack and Buzzwords, Public / Private Clouds, Utility Computing, Killer Apps, Economic Model Distributed System Basics I/O Performance Replication Strategies The Hadoop Project (Core, HDFS, Map-Reduce, HBase, HIVE) The Hadoop Distributed File System (HDFS) HDFS vs. NFS (Network File System) HDFS Example Deployments (Yahoo, Facebook) 14-2
3 Cloud Computing αγαθά Google's Datacenter in Oregon Microsoft Azure in Chicago 14-3
4 Cloud Computing (Datacenters) Datacenter 14-4
5 Cloud Computing (Cloud Stack) 14-5
6 Cloud Computing (Public vs. Private) Based on: Above the Clouds: A Berkeley View of Cloud Computing, RAD Lab, UC Berkeley 14-7
7 Cloud Computing (Utility Computing Yπ. Ωφελείας) NewSQL-as-a-Service To Amazon RDS* (Relational Database Service) 963$ / year 27,165 $ / year (*essentially MySQL running on Amazon EC2 Elastic Computing Cloud) 14-8
8 Cloud Computing (Utility Computing Yπ. Ωφελείας) 14-9
9 Cloud Computing (Virtualization - Tεχνολογία εικονικών συστημάτων) 14-10
10 Our IaaS Private Cloud Demo 14-11
11 Cloud Computing (Economic Model) 14-12
12 Cloud Computing (Killer Apps: OLTP/OLAP) 14-13
13 Cloud Computing (Killer Apps: escience) 14-14
14 Distributed Systems Basics (I/O Performance) Each Disk: 2TB 7,200 rpm 6Gb SAS (Serial Attach. SCSI) 3.5" HDD In RAID-5 configuration [10Gbps FCoE also available] 14-15
15 Distributed Systems Basics (I/O Performance) (throughput) 14-16
16 Distributed Systems Basics (I/O Performance) (Similar to Parallel but more scalable) 14-17
17 Distributed Systems Basics (I/O Performance) 14-18
18 Distributed Systems Basics (Replication Strategies) NOSQL DBMSs SQL RDBMSs 14-19
19 Distributed Systems Basics (Replication Strategies) (Recall conflict resolution in CouchDB) 14-20
20 Terminology (MR => HADOOP => HBASE) Map-Reduce: a programming model for processing large data sets. Invented by Google! "MapReduce: Simplified Data Processing on Large Clusters, Jeffrey Dean and Sanjay Ghemawat, OSDI'04: Sixth Symposium on Operating System Design and Implementation,San Francisco, CA, December, 2004." Can be implemented in any language (recall javascript Map- Reduce we used in the context of CouchDB). Hadoop: Apache's open-source software framework that supports data-intensive distributed applications Derived from Google's MapReduce + Google File System (GFS) papers. Enables applications to work with thousands of computationindependent computers and petabytes of data. Download:
21 Terminology (MR => HADOOP => HBASE) Hadoop Project Modules: Hadoop Common: The common utilities that support the other Hadoop modules. Hadoop Distributed File System (HDFS ): A distributed file system that provides highthroughput access to application data. Hadoop YARN (Yet Another Resource Negotiator): A framework for job scheduling and cluster resource management. Hadoop MapReduce (MapReduce v2.0): A YARN-based system for parallel processing of large data sets. (Next Lectures) Other Hadoop-related projects at Apache include: Ambari: Dashboard management system for Hadoop. Avro : A data serialization system. Cassandra : A scalable multi-master database with no single points of failure. Chukwa : A data collection system for managing large distributed systems. HBase (Hadoop Database): A scalable, distributed database that supports structured data storage for large tables. (Next Lectures) Hive : A data warehouse infrastructure that provides data summarization and ad hoc querying. Mahout : A Scalable machine learning and data mining library. Pig : A high-level data-flow language and execution framework for parallel computation. (Next Lectures) ZooKeeper : A high-performance coordination service for distributed applications
22 Large-Scale File Systems (GFS => HDFS) Problem: if nodes can fail, how can we store data persistently? Answer: Distributed File System (global file namespace) The Google File System, Sanjay Ghemawat, Howard Gobioff, and Shun-Tak Leung, 19th ACM Symposium on Operating Systems Principles, Lake George, NY, October,
23 Network File Systems (NFS=>GFS=>HDFS) UNIX NFS (Network File System): nfsd (deamon) mounts remote folders to a UNIX host (/etc/fstab)
24 NFS uses a Client/Server Architecture that is a single point of failure by default. Network File Systems (NFS=>GFS=>HDFS) 14-26
25 inode Δομές στο UNIX (Επανάληψη) Τι γίνεται εάν ένα αρχείο έχει πολλά blocks; Υπάρχει αρκετός χώρος για να αποθηκευτούν όλα τα i-nodes των blocks που συσχετίζονται με το αρχείο; Το Υποσύστημα Αρχείων χρησιμοποιεί ένα ιεραρχικό σχήμα το οποίο αποτελείται από δένδρα δεικτών βάθους 0 (direct, αυτό το οποίο είδαμε ήδη), 1 (single), 2 (double), και 3 (triple) 2KB block <24ΚΒ <1ΜΒ <512ΜB < max supported file size 14-27
26 Large-Scale File Systems (Hadoop File System - HDFS) Chuck (Block) Size: 4KB-32KB NFS File Size Limit = 2GB Default Chunk Size: 64 MB Unlimited File Size (21PB by Facebook) 3x replicas per chunk 14-28
27 Large-Scale File Systems (Hadoop File System - HDFS) HDFS scalability: the limits to growth
28 Large-Scale File Systems (Hadoop File System - HDFS) Namespace lookup are fast (1 Master enough!) [ 1GB Metadata = 1PB Data ] In NFS Metadata + Transfers going through same server => Not Scalable HDFS designed for unreliable hardware (2-3 failures / 1000 nodes / day) New Hardware: 3x more unreliable!!! 14-30
29 Large-Scale File Systems (Hadoop File System - HDFS) 14-31
30 User Interface API Java API C language wrapper (libhdfs) for the Java API is also avaiable POSIX like command hadoop dfs -mkdir /foodir hadoop dfs -cat /foodir/myfile.txt hadoop dfs -rm /foodir myfile.txt HDFS Admin bin/hadoop dfsadmin safemode bin/hadoop dfsadmin report bin/hadoop dfsadmin -refreshnodes Web Interface Ex:
31 Web Interface (
32 Web Interface ( Browse the file system 14-34
33 POSIX Like command 14-35
34 Latest API Java API
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