<property>

                <name>dfs.ha.automatic-failover.enabled.ns</name>

                <value>true</value>

        </property>

[kfk@bigdata-pro01 bin]$ pwd

/opt/modules/hadoop-2.6./bin

[kfk@bigdata-pro01 bin]$ ./hdfs zkfc -formatZK

// :: INFO zookeeper.ZooKeeper: Initiating client connection, connectString=bigdata-pro01.kfk.com:,bigdata-pro02.kfk.com:,bigdata-pro03.kfk.com: sessionTimeout= watcher=org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef@20deea7f

// :: INFO zookeeper.ClientCnxn: Opening socket connection to server bigdata-pro01.kfk.com/192.168.80.151:. Will not attempt to authenticate using SASL (unknown error)

// :: INFO zookeeper.ClientCnxn: Socket connection established to bigdata-pro01.kfk.com/192.168.80.151:, initiating session

// :: INFO zookeeper.ClientCnxn: Session establishment complete on server bigdata-pro01.kfk.com/192.168.80.151:, sessionid = 0x164065bc2a90001, negotiated timeout =

===============================================

The configured parent znode /hadoop-ha/ns already exists.

Are you sure you want to clear all failover information from

ZooKeeper?

WARNING: Before proceeding, ensure that all HDFS services and

failover controllers are stopped!

===============================================

Proceed formatting /hadoop-ha/ns? (Y or N) // :: INFO ha.ActiveStandbyElector: Session connected.

y

// :: INFO ha.ActiveStandbyElector: Recursively deleting /hadoop-ha/ns from ZK...

// :: INFO ha.ActiveStandbyElector: Successfully deleted /hadoop-ha/ns from ZK.

// :: INFO ha.ActiveStandbyElector: Successfully created /hadoop-ha/ns in ZK.

// :: INFO zookeeper.ClientCnxn: EventThread shut down

// :: INFO zookeeper.ZooKeeper: Session: 0x164065bc2a90001 closed

[kfk@bigdata-pro01 bin]$ 

[kfk@bigdata-pro01 hadoop-2.6.]$ pwd

/opt/modules/hadoop-2.6.

[kfk@bigdata-pro01 hadoop-2.6.]$ sbin/hadoop-daemon.sh start zkfc

starting zkfc, logging to /opt/modules/hadoop-2.6./logs/hadoop-kfk-zkfc-bigdata-pro01.kfk.com.out

[kfk@bigdata-pro02 hadoop-2.6.]$ bin/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

  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  gateway

  cacheadmin           configure the HDFS cache

  crypto               configure HDFS encryption zones

  storagepolicies      get all the existing block storage policies

  version              print the version

Most commands print help when invoked w/o parameters.

[kfk@bigdata-pro02 hadoop-2.6.]$

[kfk@bigdata-pro02 hadoop-2.6.]$ bin/hdfs haadmin -help

Usage: DFSHAAdmin [-ns <nameserviceId>]

    [-transitionToActive <serviceId> [--forceactive]]

    [-transitionToStandby <serviceId>]

    [-failover [--forcefence] [--forceactive] <serviceId> <serviceId>]

    [-getServiceState <serviceId>]

    [-checkHealth <serviceId>]

    [-help <command>]

Generic options supported are

-conf <configuration file>     specify an application configuration file

-D <property=value>            use value for given property

-fs <local|namenode:port>      specify a namenode

-jt <local|resourcemanager:port>    specify a ResourceManager

-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster

-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.

-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is

bin/hadoop command [genericOptions] [commandOptions]

[kfk@bigdata-pro02 hadoop-2.6.]$ 

bin/hdfs haadmin -transitionToActive nn1

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