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The client can decide what will the replication factor. 22. dfs.replication 2 You have to select the right answer to a question. 1 for clusters < four nodes. d) hdfs-site.xml. If you wish to learn Hadoop from top experts, I recommend this Hadoop Certification course by Intellipaat. Apache Sqoop is used to import the structured data from RDBMS such as MySQL, Oracle, etc. The default replication factor in HDFS is controlled by the dfs.replication property.. Let’s walk through a real analysis of why. The value is 3 by default.. To change the replication factor, you can add a dfs.replication property settings in the hdfs-site.xml configuration file of Hadoop: dfs.replication 1 Replication factor. How to configure Replication in Hadoop? b) yarn-site.xml. 21. This Hadoop Test contains around 20 questions of multiple choice with 4 options. a) True. This is the main configuration file for HDFS. Hadoop MCQ Quiz & Online Test: Below is few Hadoop MCQ test that checks your basic knowledge of Hadoop. Name the configuration file which holds HDFS tuning parameters: mapred-site.xml: core-site.xml: answer hdfs-site.xml: 2. Replication is nothing but making a copy of something and the number of times you make a copy of that particular thing can be expressed as it’s Replication Factor. Where is the HDFS replication factor controlled? It defines the namenode and datanode paths as well as replication factor. c) core-site.xml. b) False. Apache Sqoop can also be used to move the data from HDFS to RDBMS. You can change the default replication factor from the Client node. 2 for clusters < … • For each block stored in HDFS, there will be n-1 duplicated blocks distributed across the cluster. • The replication factor is a property that can be set in the HDFS configuration file that will allow you to adjust the global replication factor for the entire cluster. Hdfs-site.xml is a client configuration file needed to access HDFS — it needs to be placed on every node that has some HDFS role running. Name the parameter that controls the replication factor in HDFS: dfs.block.replication: dfs.replication.count: answer dfs.replication: replication.xml: 3. 23. hdfs-site.xml. ( D) a) mapred-site.xml. and move to HBase, Hive, or HDFS. Amazon EMR automatically calculates the replication factor based on cluster size. To overwrite the default value, use the hdfs-site classification. Find this file in … I need only 2 exact copy of file i.e dfs.replication = 2. The real reason for picking replication of three is that it is the smallest number that allows a highly reliable design. Now while I am trying to upload a new file it is replicating the files block in both data nodes but it still consider the 3rd replication as a under replicated blocks.How to resolve this ? You need to set one property in the hdfs-site.xml file as shown below. Here is simple for the replication factor: 'N' Replication Factor = 'N' Slave Nodes Note: If the configured replication factor is 3 times but using 2 slave machines than actual replication factor is also 2 times. So go to your Hadoop configuration folder in the client node. As we have seen in File blocks that the HDFS stores the data in the form of various blocks at the same time Hadoop is also configured to make a copy of those file blocks. If the replication factor is 10 then we need 10 slave nodes are required. Read the statement and select the correct option: ( B) It is necessary to default all the properties in Hadoop config files. I have setup a 2 nodes HDFS cluster and given replication factor 2.

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