Explain which commands are used to make changes in HDFS. Identify the commands used to upload data from the command line to the HDFS. Recognize two operations the HDFS performs when a user moves files. Summarize how to remove files recursively in HDFS. Recall how to select and implement partitions. Explain how to flatten a Struct data type in Start Knox. When starting the gateway with the script below, the process runs in the background. The log output is written to /var/log/knox and a PID (process ID) is written to /var/run/knox.Execute this command on the Knox host machine. Writing and reading to HDFS is done with command hdfs dfs. First, manually create your home directory. All other commands will use a path relative to this default home directory: hdfs dfs -mkdir -p /user/hadoop Let's use some textbooks from the Gutenberg project as an example. Create a books directory in HDFS. Note: is the directory in local file system that will save a copy of the backup data under /hadoop/hdfs. (2) remove /hadoop/hdfs from ONE data node first. Please make sure the Name Node and/or Secondary Name node are not on this data node.. Steps to remove /hadoop/hdfs from "dfs.data.dir": 1. Run hadoop fsck command: $ hadoop fsck / In this tutorial, we will walk you through the Hadoop Distributed File System (HDFS) commands you will need to manage files on HDFS. HDFS command is used most of the times when working with Hadoop File System. It includes various shell-like commands that directly interact with the Hadoop Below will be the log entry stating that Safe Mode is entered Manually by hadoop1 user. Now, only hadoop1 user can leave the Safe Mode. Note: If Safe Mode is entered m anually then it must be removed manually only otherwise it will not leave automatically. 3. To l eave safe mode manually, use below command. First of all there is no command like hdfs dfs -cd in Hadoop. In Hadoop you have to provide the whole path manually. I would recommend you