You can specify -conffile option multiple times. You can specify either a file or directory, and if a directory specified, the files in that directory whose name end with. If specified, that path will be verified. If the -conffile option is not specified, the files in $ whose name end with. Path of a configuration file or directory to validate The latter is useful in environments where wildcards cannot be used and the expanded classpath exceeds the maximum supported command line length. Additional options print the classpath after wildcard expansion or write the classpath into the manifest of a jar file. If called without arguments, then prints the classpath set up by the command scripts, which is likely to contain wildcards in the classpath entries. Prints the class path needed to get the Hadoop jar and the required libraries. Write classpath as manifest in jar named path By default, this command only checks the availability of libhadoop. See Native Libaries for more information. This command checks the availability of the Hadoop native code. More information can be found at Hadoop Archives Guide. User CommandsĬommands useful for users of a hadoop cluster. They have been broken up into User Commands and Administration Commands. Applies only to job.Īll of these commands are executed from the hadoop shell command. Specify comma separated jar files to include in the classpath. Overrides ‘fs.defaultFS’ property from configurations. Specify comma separated files to be copied to the map reduce cluster. Specify an application configuration file. Specify comma separated archives to be unarchived on the compute machines. Many subcommands honor a common set of configuration options to alter their behavior: GENERIC_OPTION If possible, execute this command on all hosts in the workers file. Valid log levels are FATAL, ERROR, WARN, INFO, DEBUG, and TRACE. If -workers is not used, this option is ignored. When -workers is used, override the workers file with another file that contains a list of hostnames where to execute a multi-host subcommand. When -workers is used, override the workers file with a space delimited list of hostnames where to execute a multi-host subcommand. For commands that do not support daemonization, this option is ignored.Įnables shell level configuration debugging information If no option is provided, commands that support daemonization will run in the foreground. status will return an LSB-compliant result code. Supported modes are start to start the process in daemon mode, stop to stop the process, and status to determine the active status of the process. If the command supports daemonization (e.g., hdfs namenode), execute in the appropriate mode. Overwrites the default Configuration directory. For example, passing -hostnames on a command that only executes on a single host will be ignored. For some commands, these options are ignored. HDFS and YARN are covered in other documents.Īll of the shell commands will accept a common set of options. Various commands with their options are described in this documention for the Hadoop common sub-project. The common set of options supported by multiple commands. Options that the shell processes prior to executing Java. For example, Hadoop common uses hadoop, HDFS uses hdfs, and YARN uses yarn. The command of the project being invoked. Running Applications in runC ContainersĪll of the Hadoop commands and subprojects follow the same basic structure:.Running Applications in Docker Containers.
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