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基于hadoop數(shù)據(jù)倉庫-文庫吧

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【正文】 lection system for managing large distributed systems. HBase: A scalable, distributed database that supports structured data storage for large tables. HDFS: A distributed file system that provides high throughput access to application data. Hive: A data warehouse infrastructure that provides data summarization and ad hoc querying. MapReduce: A software framework for distributed processing of large data sets on pute clusters. Pig: A highlevel dataflow language and execution framework for parallel putation. ZooKeeper: A highperformance coordination service for distributed applications. Hadoop的體系架構(gòu) HadoopHDFS ? HDFS的結(jié)構(gòu)按照 GFS設(shè)計(jì) ? A GFS cluster consists of a single master and multiple ? chunkservers and is accessed by multiple clients HDFS ? Faulttolerant, 容錯(cuò)性 ? Run on modity hardware,在通用的機(jī)器上運(yùn)行 ? Scalable 可擴(kuò)縮的 1個(gè)namenode 多個(gè)datanodes 11 HDFS ? NameNode –存貯 HDFS的元數(shù)據(jù) (metadata) –管理文件系統(tǒng)的命名空間( namespace) 187。 創(chuàng)建、刪除、移動(dòng)、重命名文件和文件夾 –接收從 DataNode來的 Heartbeat 和 Blockreport ? DataNode –存貯數(shù)據(jù)塊 –執(zhí)行從 Namenode來的文件操作命令 –定時(shí)向 NameNode發(fā)送 Heartbeat和 Blockreport Heartbeat和 Blockreport Namenode Metadata: 1,(1,2) 2,(2,3) 3,(1,3) Datanode 1 Datanode 2 Datanode 3 1 1 3 3 2 2 1,3 1,2 2,3 13 Data Flow ? File Read 14 Data Flo
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