[admin@emr-driver-1 ~]$ hadoop --help Usage: hadoop [--config confdir] COMMAND where COMMAND is one of: fs run a generic filesystem user client version print the version jar <jar> run a jar file checknative [-a|-h] check native hadoop and compression libraries availability distcp <srcurl> <desturl> copy file or directories recursively archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive classpath prints the class path needed to get the credential interact with credential providers Hadoop jar and the required libraries daemonlog get/set the log level for each daemon trace view and modify Hadoop tracing settings or CLASSNAME run the class named CLASSNAME
Most commands print help when invoked w/o parameters.
[admin@emr-driver-1 ~]$ hdfs --help Usage: hdfs [--config confdir] COMMAND where COMMAND is one of: dfs run a filesystem command on the file systems supported in Hadoop. namenode -format format the DFS filesystem secondarynamenode run the DFS secondary namenode namenode run the DFS namenode journalnode run the DFS journalnode zkfc run the ZK Failover Controller daemon datanode run a DFS datanode dfsadmin run a DFS admin client diskbalancer Distributes data evenly among disks on a given node haadmin run a DFS HA admin client fsck run a DFS filesystem checking utility balancer run a cluster balancing utility jmxget get JMX exported values from NameNode or DataNode. mover run a utility to move block replicas across storage types oiv apply the offline fsimage viewer to an fsimage oiv_legacy apply the offline fsimage viewer to an legacy fsimage oev apply the offline edits viewer to an edits file fetchdt fetch a delegation token from the NameNode getconf get config values from configuration groups get the groups which users belong to snapshotDiff diff two snapshots of a directory or diff the current directory contents with a snapshot lsSnapshottableDir list all snapshottable dirs owned by the current user Use -help to see options portmap run a portmap service nfs3 run an NFS version 3 gateway cacheadmin configure the HDFS cache crypto configure HDFS encryption zones storagepolicies list/get/set block storage policies version print the version
Most commands print help when invoked w/o parameters.
mapred脚本
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[admin@emr-driver-1 ~]$ mapred --help Usage: mapred [--config confdir] COMMAND where COMMAND is one of: pipes run a Pipes job job manipulate MapReduce jobs queue get information regarding JobQueues classpath prints the class path needed for running mapreduce subcommands historyserver run job history servers as a standalone daemon distcp <srcurl> <desturl> copy file or directories recursively archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive archive-logs combine aggregated logs into hadoop archives hsadmin job history server admin interface
Most commands print help when invoked w/o parameters.
[admin@emr-driver-1 ~]$ yarn --help Usage: yarn [--config confdir] COMMAND where COMMAND is one of: resourcemanager -format-state-store deletes the RMStateStore resourcemanager run the ResourceManager Use -format-state-store for deleting the RMStateStore. Use -remove-application-from-state-store <appId> for removing application from RMStateStore. nodemanager run a nodemanager on each slave timelineserver run the timeline server rmadmin admin tools version print the version jar <jar> run a jar file application prints application(s) report/kill application applicationattempt prints applicationattempt(s) report container prints container(s) report node prints node report(s) queue prints queue information logs dump container logs classpath prints the class path needed to get the Hadoop jar and the required libraries daemonlog get/set the log level for each daemon top run cluster usage tool or CLASSNAME run the class named CLASSNAME
Most commands print help when invoked w/o parameters.
