There are a couple of ways to determine when the server has been last rebooted in Linux Operating System.
Option 1: Using “who” command.
Option 2: Using “uptime” command
Option 3: Using “last reboot” command
Virtual networking for docker
Docker 1.3 with improved security
VMWare and Docker
CoreOS offers private docker registry
Micro-services and continuous delivery
51. What is Identity Mapper and Identity Reducer in MapReduce?
◦ org.apache.hadoop.mapred.lib.IdentityMapper: Implements the identity function, mapping inputs directly to outputs. If MapReduce programmer does not set the Mapper Class using JobConf.setMapperClass then IdentityMapper.class is used as a default value.
◦ org.apache.hadoop.mapred.lib.IdentityReducer: Performs no reduction, writing all input values directly to the output. If MapReduce programmer […]
41. What do you mean by Task Instance?
Ans: Task instances are the actual MapReduce jobs which run on each slave node. The Task Tracker starts a separate JVM processes to do the actual work (called as Task Instance) this is to ensure that process failure does not take down the entire task tracker. Each Task […]