Learn Hadoop and build Hadoop with some special problems

I perform the following steps:

1. dynamically increase datanode nodes and Tasktracker nodes

in host226 as an example

Execute on host226:

Specify host Name

Vi/etc/hostname

Specify host name-to-IP-address mappings

Vi/etc/hosts

(the hosts are the Datanode and TRAC)

Adding users and Groups

AddGroup Hadoop

AddUser--ingroup Hadoop Hadoop

Change temporary directory permissions

chmod 777/tmp

Execute on HOST2:

VI conf/slaves

Increase host226

Ssh-copy-id-i. ssh/id_rsa.pub [Email protected]

Scp-r/home/hadoop/hadoop-1.1.2 [Email protected]:/home/hadoop/hadoop-1.1.2

Execute on HOST8:

VI conf/slaves

Increase host226

Ssh-copy-id-i. ssh/id_rsa.pub [Email protected]

Performed on host226:

hadoop-daemon.sh Start Datanode

hadoop-daemon.sh Start Tasktracker

Since then I went to verify:

Web page:

However click:

The Host2, Host6, and HOST8 under node column can appear like the following interface

and click Host9

Learn Hadoop and build Hadoop with some special problems