You need to configure slave's IP's in $HADOOP_HOME/etc/hadoop/slaves file..
Hence edit this file configure the slave machine IP and start the cluster using start-dfs in master machine.. By default $HADOOP_HOME/etc/hadoop/slaves will be having the entry as localhost hence one DN is started in master machine.. Thanks & Regards Brahma Reddy Battula ________________________________________ From: EdwardKing [zhan...@neusoft.com] Sent: Monday, February 17, 2014 7:04 AM To: user@hadoop.apache.org Subject: Re: Start hadoop service My OS is CenterOS 2.6.18, master IP is 172.11.12.6 and slave IP is 172.11.12.7 First I start hadoop service under master,like follows: [hadoop@master ~]$ cd /home/software/hadoop-2.2.0/sbin [hadoop@master ~]$./start-dfs.sh 14/02/16 17:24:16 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Starting namenodes on [master] master: starting namenode, logging to /home/software/hadoop-2.2.0/logs/hadoop-hadoop-namenode-master.out master: starting datanode, logging to /home/software/hadoop-2.2.0/logs/hadoop-hadoop-datanode-master.out Starting secondary namenodes [master] master: starting secondarynamenode, logging to /home/software/hadoop-2.2.0/logs/hadoop-hadoop-secondarynamenode-master.out 14/02/16 17:24:43 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable [hadoop@master ~]$./start-yarn.sh starting yarn daemons starting resourcemanager, logging to /home/software/hadoop-2.2.0/logs/yarn-hadoop-resourcemanager-master.out master: starting nodemanager, logging to /home/software/hadoop-2.2.0/logs/yarn-hadoop-nodemanager-master.out [hadoop@master ~]$./mr-jobhistory-daemon.sh start historyserver starting historyserver, logging to /home/software/hadoop-2.2.0/logs/mapred-hadoop-historyserver-master.out [hadoop@master ~]$jps 4439 DataNode 5400 Jps 4884 NodeManager 4331 NameNode 5342 JobHistoryServer 4595 SecondaryNameNode Then I open firefox to view hadoop service,like follows: http://172.11.12.6:9002/dfshealth.jsp NameNode 'master:9000' (active) ...... Live Nodes : 1 (Decommissioned: 0) http://172.11.12.6:8088/cluster Firefox can't establish a connection to the server at 172.11.12.6:8088. http://172.11.12.6:9002/dfsnodelist.jsp?whatNodes=LIVE Live Datanodes : 1 master 172.11.12.6:50010 ...... If I start hadoop service under slave, then I open firefox to view hadoop service correct,like follows: http://172.11.12.6:9002/dfsnodelist.jsp?whatNodes=LIVE Live Datanodes : 2 master 172.11.12.6:50010 ...... slave 172.11.12.7:........ Why need I start hadoop service again under slave? Which configuration file is wrong? Thanks ----- Original Message ----- From: Anand Mundada To: user@hadoop.apache.org Cc: <user@hadoop.apache.org> Sent: Monday, February 17, 2014 9:12 AM Subject: Re: Start hadoop service No. You don't need to. Master will start all required daemons on slave. Check all daemons using jps command. Sent from my iPhone On Feb 16, 2014, at 7:03 PM, EdwardKing <zhan...@neusoft.com> wrote: I have install hadoop-2.2.0 under two machine,one is master and other is slave,then I start hadoop service under master machine. [hadoop@master ~]$./start-dfs.sh [hadoop@master ~]$./start-yarn.sh [hadoop@master ~]$./mr-jobhistory-daemon.sh start historyserver My question is whether I need start hadoop service under slave machine again? Thanks. [hadoop@slave ~]$./start-dfs.sh [hadoop@slave ~]$./start-yarn.sh [hadoop@slave ~]$./mr-jobhistory-daemon.sh start historyserver --------------------------------------------------------------------------------------------------- Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and may be confidential and/or privileged of Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is not the intended recipient, unauthorized use, forwarding, printing, storing, disclosure or copying is strictly prohibited, and may be unlawful.If you have received this communication in error,please immediately notify the sender by return e-mail, and delete the original message and all copies from your system. Thank you. --------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------- Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and may be confidential and/or privileged of Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is not the intended recipient, unauthorized use, forwarding, printing, storing, disclosure or copying is strictly prohibited, and may be unlawful.If you have received this communication in error,please immediately notify the sender by return e-mail, and delete the original message and all copies from your system. Thank you. ---------------------------------------------------------------------------------------------------
