Corrupt System Files

When you are finished, it is not a good way to turn off the power directly. This may cause the updated files to be corrupted or even corrupt the file system directory structure. Linux has a number of secure shutdown and restart systems, which are outlined in this section. Terminating or shutting down the System init command allows you to modify the current runlevel, the RunLevel value is 0 for shutting down the system, the following is an example: [Root@bigboy tmp]# init 0 Fedora also uses the shutdown command to do the same function. Often ...

Refer to Hadoop_hdfs system dual-machine hot standby scheme. PDF, after the test has been added to the two-machine hot backup scheme for Hadoopnamenode 1, foreword currently hadoop-0.20.2 does not provide a backup of name node, just provides a secondary node, although it is somewhat able to guarantee a backup of name node, when the machine where name node resides ...

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hive is a Hadoop-based data warehouse tool that maps structured data files to a database table and provides full sql query capabilities to convert sql statements to MapReduce jobs. The advantage is low learning costs, you can quickly achieve simple MapReduce statistics through class SQL statements, without having to develop a dedicated MapReduce application, is very suitable for statistical analysis of data warehouse. Hadoop is a storage computing framework, mainly consists of two parts: 1, storage (...

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The advent of cloud computing has proclaimed the advent of Low-cost supercomputing, which has pushed human society into an era of hyper-sharing with its superior computing power, low cost and high efficiency, and the construction of digital archives has entered a qualitative change. In the past two years, all the archives have considered relying on the existing hardware network equipment to build a national and regional cloud computing platform to achieve the unified management of huge amount of archival information. Using cloud computing Architecture system platform, can make a large number of file servers work together to facilitate the deployment and opening of archival operations, rapid detection and recovery of system failures, to the daily ...

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