The default replication factor in HDFS is controlled by the dfs.replication property.. 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. Name the configuration file which holds HDFS tuning parameters: mapred-site.xml: core-site.xml: answer hdfs-site.xml: 2. 1 for clusters < four nodes. Hadoop MCQ Quiz & Online Test: Below is few Hadoop MCQ test that checks your basic knowledge of Hadoop. You have to select the right answer to a question. Read the statement and select the correct option: ( B) It is necessary to default all the properties in Hadoop config files. 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. 21. Find this file in … 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 ? 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. Name the parameter that controls the replication factor in HDFS: dfs.block.replication: dfs.replication.count: answer dfs.replication: replication.xml: 3. Amazon EMR automatically calculates the replication factor based on cluster size. You can change the default replication factor from the Client node. 2 for clusters < … 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. If the replication factor is 10 then we need 10 slave nodes are required. ( D) a) mapred-site.xml. The client can decide what will the replication factor. d) hdfs-site.xml. and move to HBase, Hive, or HDFS. I have setup a 2 nodes HDFS cluster and given replication factor 2. c) core-site.xml. • For each block stored in HDFS, there will be n-1 duplicated blocks distributed across the cluster. 23. You need to set one property in the hdfs-site.xml file as shown below. Apache Sqoop is used to import the structured data from RDBMS such as MySQL, Oracle, etc. The real reason for picking replication of three is that it is the smallest number that allows a highly reliable design. Let’s walk through a real analysis of why. a) True. This Hadoop Test contains around 20 questions of multiple choice with 4 options. Apache Sqoop can also be used to move the data from HDFS to RDBMS. How to configure Replication in Hadoop? 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. b) False. I need only 2 exact copy of file i.e dfs.replication = 2. • 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. If you wish to learn Hadoop from top experts, I recommend this Hadoop Certification course by Intellipaat. So go to your Hadoop configuration folder in the client node. dfs.replication 2 b) yarn-site.xml. To overwrite the default value, use the hdfs-site classification. hdfs-site.xml. This is the main configuration file for HDFS. It defines the namenode and datanode paths as well as replication factor. Where is the HDFS replication factor controlled? 22. A real analysis of why let ’ s walk to control hdfs replication factor, which configuration file is used? a real of... 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