Hadoop学习第4天——JobTracker TaskTracker

roger2001c

　　翻译《Pro Hadoop 》Jason Venner著，部分章节
　　JobTracker & TaskTracker
　　The framework provides two processes that handle the management of MapReduce jobs:
· TaskTracker manages the execution of individual map and reduce tasks on a compute
node in the cluster.
· JobTracker accepts job submissions, provides job monitoring and control, and manages
the distribution of tasks to the TaskTracker nodes.
　　MapReduce job的管理有两种：TaskTracker 和JobTracker
　　TaskTracker ——map和reduce任务的执行
　　JobTracker ——map和reduce任务的接受，监控和管理TaskTracker 的分布式任务
　　1个节点上有1个JobTacker，但有1个或以上的TaskTracker，
　　

　　NameNode & DataNode
　　HDFS services are provided by two processes:HDFS服务提供2个进程
· NameNode handles management of the file system metadata, and provides management
and control services.
· DataNode provides block storage and retrieval services.
　　NameNode提供管理，文件系统元数据，管理和监控服务，DataNode用于数据存储和检索服务