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醉染图书设据密集型应用()9787564173852
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PrefacePart I.Foundations of Data Systems1.Reliable,Scalable,and Maintainable Applications 3Thinking About Data Systems 4Reliability 6Hardware Faults 7Software Errors 8Human Errors 9How Important Is Reliability? 10Scalability 10Describing Load 11Describing Performance 13Approaches for Coping with Load 17Maintainability 18Operability:Making Life Easy for Oraios 19Simplicity:Managing Complexity 20Evolvability:Making Change Easy 21Summary 222.Data Models and ery Languages 27Relational Model Versus Document Model 28The Birth of NoSL 29The Object-Relational Mismatch 29Many-to-One and Many-to-Many Relationships 33Are Document Databases Reaig History? 36Relational Versus Document Databases Today 38ery Languages for Data 42Declarative eries on the Web 44MapReduce erying 46Graph-Like Data Models 49Property Graphs 50The Cypher ery Language 52Graph eries in SL 3Triple-Stores and SPARL 5The Foundation:Datalog 60Summary 633.Storage and Retrieval 69Data Structures That Power Your Database 70Hash Indexes 72SSTables and LSM-Trees 76B-Trees 79Comparing B-Trees and LSM-Trees 83Other Indexing Structures 85Transaction Processing or Analytics? 90Data Warehousing 91Stars and Snowflakes:Schemas for Analytics 93Column-Oriented Storage 95Column Compression 97Sort Order in Column Storage 99Writing to Column-Oriented Storage 101Aggregation:Data Cubes and Materialized Views 101Summary 1034.Encoding and Evolution 111Formats for Encoding Data 112Language-Specific Formats 113JSON,XML,and Binary Variants 114ThrifndPrtocol Buffers 117Avr 22The Merits of Schemas 127Modes of Dataflw 28Dataflow Through Databases 129Dataflow Through Services:REST and RPC 131Message-Passing Dataflw 36Summary 139Part I.istributed Data5.Replication 151Leaders and Followers 152Synchronous Versus Asynchronous Replication 153Setting Up New Followers 155Handling Node Outages 156Implementation of Replication Logs 158Problems with Replication Lag 161Reading Your Own Writes 162Monotonic Reads 164Consistent Prefix Reads 165Solutions for Replication Lag 167Multi-Leader Replication 168Use Cases for Multi-Leader Replication 168Handling Write Conflicts 171Multi-Leader Replication Topologies 175Leaderless Replication 177Writing to the Database When a Node s own 177Limitations of orum Consistency 181Sloppy orums and Hinted Handoff 183Detecting Concurrent Writes 184Summary 1926.Partitioning 199Partitioning and Replication 200Partitioning of Key-Value Data 201Partitioning by Key Range 202Partitioning by Hash of Key 203Skewed Workloads and Relieving Hot Spots 205Partitioning and Secondary Indexes 206Partitioning Secondary Indexes by Document 206Partitioning Secondary Indexes by Term 208Rebalancing Partitions 209Strategies for Rebalancing 210Oraios:Automatic or Manual Rebalancing 213Request Routing 214Parallel ery Execution 216Summary 2167.Transactions 221The Slippery Concept of a Transaction 222The Meaning of AC 2Single-Object an Mt-Object Oraios 228Weak Isolation Levels Read Committed 4Snapshot Isolation and Repeatable Read Preventing Lost Updates 242Write Skew and Phantoms 246Serializability 251Actual Serial Execution 252Two-Phase Locking (2PL) 257Serializable Snapshot Isolation (SSI) 261Summary 2668.The Trouble with Distributed Systems 273Faults and Partial Failures 274Cloud Computing and Supercomputing 275Unreliable Networks 277Network Faults in Practice 279Detecting Faults 280Timeouts and Unbounded Delays 281Synchronous Versus Asynchronous Networks 284Unreliable Clocks 287Monotonic Versus Time-of-Day Clocks 288Clock Synchronization and Accuracy 289Relying on Synchronized Clocks 291Process Pauses 295Knowledge,Truth,and Lies 300The Truth s efined by the Majority 300Byzantine Faults 304System Model and Reality 306Summary 3109.Consistency and Consensus 321Consistency Guarantees 322Linearizability 324What Makes a System Linearizable? 325Relying on Linearizability 330Implementing Linearizable Systems 332The Cost of Linearizability 335Ordering Guarantees 339Ordering and Causality 339Sequence Number Ordering 343Total Order Broadcast 348Distributed Transactions and Consensus 352Atomic CommindTw-Phase Commit (2PC) 354Distributed Transactions in Practice 360Fault-Tolerant Consensus 364Membership and Coordination Services 370Summary 373Part II.erived Data10.Batch Processing 389Batch Processing with Unix Tools 391Simple Log Analysis 391The Unix Philosophy 394MapReduce and Distributed Filesystems 397MapReduce Job Execution 399Reduce-Side Joins and Grouping 403Map-Side Joins 408The Output of Batch Workflows 411Comparing Hadoop to Distributed Databases 414Beyond MapReduce 419Materialization of Intermediate State 419Graphs and Iterative Processing 424High-Level APIs and Languages 426Summary 42911.Stream Processing 439Transmitting Event Streams 440Messaging Systems 441Partitioned Logs 446Databases and Streams 451Keeping Systems in Sync 452Change Data Capture 454Event Sourcing 457State,Streams,and Immutability 459Processing Streams 464Uses of Stream Processing 465Reasoning About Time 468Stream Joins 472Fault Tolerance 476Summary 47912.The Future of Data Systems 489Data Integration 490Combining Specialized Tools by Deriving Data 490Batch and Stream Processing 494Unbundling Databases 499Coing Data Storage Technologies 499Designing Applications Around Dataflow 504Observing Derived State 509Aiming for Correctness 515The End-to-En Aguent for Databases 516Enforcing Constraints 521Timeliness and Integrity 524Trust,but Verify 528Doing the Right Thing 533Predictive Analytics 533Privacy and Tracking 536Summary 543Glossary 553Index 559
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