Salt, or SaltStack, is a remote execution tool and configuration management system. The remote execution capabilities allow administrators to run commands on various machines in parallel with a flexible targeting system. The configuration management functionality establishes a client-server model to quickly...
# 1、在hadoop-node1上执行如下命令生成公私密钥:$ ssh-keygen -t rsa -P '' -f ~/.ssh/id_dsa# 2、然后将master公钥id_dsa复制到hadoop-node1|hadoop-node2|hadoop-node3进行公钥认证。$ ssh-copy-id -i /root/.ssh/id_dsa.pub hadoop-node1$ ssh-copy-id -i /root/.ssh/id_dsa.pub hadoop...
<command>nohup /opt/installs/hadoop2.9.2/bin/yarn jar /opt/app/${project.build.finalName}.jar > /opt/logs/mr.out 2>&1 &</command> </commands> <!--是否显示命令执行结果--> <displayCommandOutputs>true</displayCommandOutputs> </configuration> </plugin> 1. 2. 3. 4. 5. 6. 7. 8....
Hadoop是Apache软件基金会下一个开源分布式计算平台,以HDFS(Hadoop Distributed File System)、MapReduce(Hadoop2.0加入了YARN,Yarn是资源调度框架,能够细粒度的管理和调度任务,还能够支持其他的计算框架,比如spark)为核心的Hadoop为用户提供了系统底层细节透明的分布式基础架构。hdfs的高容错性、高伸缩性、高效性等优点让用...
Use one of the following commands to start the MapReduce job: If the default storage isAzure Storage: Bash yarn jar /usr/hdp/current/hadoop-mapreduce-client/hadoop-streaming.jar \ -files wasbs:///mapper.exe,wasbs:///reducer.exe \ -mapper mapper.exe \ -reducer reducer.exe \ -inpu...
Grouping 这个概念比较难理解, 意思是在数据给reducer前再进行一次分组, 一组数据给到同一个reducer执行一次, 他们的key用的是分组中第一个数据的key https://stackoverflow.com/questions/14728480/what-is-the-use-of-grouping-comparator-in-hadoop-map-reduce ...
src\main\java\org\apache\hadoop\examples: Contains your application code. src\test\java\org\apache\hadoop\examples: Contains tests for your application. Remove the generated example code. Delete the generated test and application files AppTest.java, and App.java by entering the commands belo...
Use one of the following commands to start the MapReduce job: If the default storage is Azure Storage: Bash Copy yarn jar /usr/hdp/current/hadoop-mapreduce-client/hadoop-streaming.jar \ -files wasbs:///mapper.exe,wasbs:///reducer.exe \ -mapper mapper.exe \ -reducer reducer.exe \ ...
Running maintenance commands in synchronous mode. Running maintenance commands in asynchronous mode. Customizing report monitoring metrics. Exporting report monitoring data. Runing a command in asynchronous mode using SNMP. Restarting the Web service. Customizing monitoring metrics for static resource pools. ...
HCatalog is also a Hadoop-based table and storage management layer that enables convenient data read/write on tables of HDFS using different data processing tools such as MapReduce. HCatalog also provides read/write APIs for these tools and uses a Hive CLI to publish commands for defining data...