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What are the different configuration files in Hadoop ?

What are the Different configuration files in hadoop
Configuration files in hadoop
Configuration Filenames Description Of Log Files
hadoop-env.sh Environment variables that are used in the scripts to run Hadoop
core-site.xml Configuration settings for Hadoop Core such as I/O settings that are common to HDFS and MapReduce.
hdfs-site.xml Configuration setting for HDFS daemons, the namenode, the secondary namenode and the data nodes.
mapred-site.xml Configuration settings for MapReduce daemons : the job –tracker and the task-trackers.
yarn-site.xml Configuration settings for ResourceManager and NodeManager.
masters A list of machines(one per line) that each run a secondary namenode
slaves A list of machines(one per line) that each run a datanode and a task-trackers
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How to recover a NameNode when it is down ?

How to recover a NameNode
    • The following steps need to execute to make the Hadoop cluster up and running :
      • Use the FsImage which is file system metadata replica to start a new NameNode.
Name Node
    • Configure the DataNodes and also the clients to make them acknowledge the newly started NameNode.
    • Once the new NameNode completes loading the last checkpoint FsImage which has received enough block reports from the DataNodes, it will start to serve the client.
    • In case of large Hadoop clusters, the NameNode recovery process consumes a lot of time which turns out to be a more significant challenge in case of routine maintenance.
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