Section 4:27.Reviewing-map-reduce-job-logs-using-resource-manager-and-job-history-server-ui
In Hadoop, you can review MapReduce job logs using the Resource Manager and Job History Server UI. Here are the steps to do this: Open the Resource Manager UI: Open a web browser and go to the URL of the Resource Manager UI. By default, the URL is http://<resource-manager-hostname>:8088/cluster. Select the job: Click on the …
Section 4 :25.Understanding yarn and map reduce configuration properties
In Hadoop, the configuration properties for YARN and MapReduce are set in XML files. Here are some of the key XML files and their corresponding configuration properties for YARN and MapReduce: yarn-site.xml: This file contains the configuration properties for YARN. Some of the key properties that can be set in this file are: yarn.resourcemanager.hostname: This …
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Section 4:24.Determining number of mappers and-reducers
Determining the optimal number of mappers and reducers for a MapReduce job depends on several factors, such as the size of the input data, the available resources, the processing capacity of each node in the cluster, and the complexity of the processing logic. In general, the number of mappers should be proportional to the size …
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Section 4: 23.Submitting map reduce job using yarn wordcount
Let us understand how we can submit map reduce job using YARN.On our state-of-the-art-labs, we can search for appropriate hadoop examples jar by using find command.find /usr/hdp —name”hadoopexamples*jar”Pick up the latest version and use as part of the hadoop jar command to submit the job.• The jar file is runnable jar and we can invoke …
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Distributed-computing-using-yarn-and-map-reduce-2-quick-overview
YARN (Yet Another Resource Negotiator) is a resource management layer in Apache Hadoop that enables the processing of large datasets across a cluster of computers. It separates the job scheduling and resource management functions that were previously combined in Hadoop MapReduce, allowing for more flexibility and scalability in distributed computing. MapReduce is a programming model …
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Section 4 :21.Hadoop distributed file system quick overview
NameNode: NameNode works as a Master in a Hadoop cluster that guides the Datanode(Slaves). Namenode is mainly used for storing the Metadata i.e. the data about the data. Meta Data can be the transaction logs that keep track of the user’s activity in a Hadoop cluster. Meta Data can also be the name of the …
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