Install HomeBrew
Installing Hadoop
SSH Localhost
Configuring Hadoop
Starting and Stopping Hadoop
Good to know

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Install HomeBrew

Found here: http://brew.sh/ or simply paste this inside the terminal

$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Install Hadoop

$ brew install hadoop

Hadoop will be installed in the following directory
/usr/local/Cellar/hadoop

Configuring Hadoop

Edit hadoop-env.sh

The file can be located at /usr/local/Cellar/hadoop/2.6.0/libexec/etc/hadoop/hadoop-env.sh
where 2.6.0 is the hadoop version.

Find the line with

export HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true"

and change it to

export HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true -Djava.security.krb5.realm= -Djava.security.krb5.kdc="

Edit Core-site.xml

The file can be located at /usr/local/Cellar/hadoop/2.6.0/libexec/etc/hadoop/core-site.xml

 <configuration>
  <property>
     <name>hadoop.tmp.dir</name>  
<value>/usr/local/Cellar/hadoop/hdfs/tmp</value>
    <description>A base for other temporary directories.</description>
  </property>
  <property>
     <name>fs.default.name</name>                                     
     <value>hdfs://localhost:9000</value>                             
  </property>                                                        
</configuration> 

Edit mapred-site.xml

The file can be located at /usr/local/Cellar/hadoop/2.6.0/libexec/etc/hadoop/mapred-site.xml and by default will be blank.

 <configuration>
       <property>
         <name>mapred.job.tracker</name>
         <value>localhost:9010</value>
       </property>
 </configuration>

Edit hdfs-site.xml

The file can be located at /usr/local/Cellar/hadoop/2.6.0/libexec/etc/hadoop/hdfs-site.xml

 <configuration>
    <property>
      <name>dfs.replication</name>
      <value>1</value>
     </property>
 </configuration> 

To simplify life edit your ~/.profile using vim or your favorite editor and add the following two commands

alias hstart="/usr/local/Cellar/hadoop/2.6.0/sbin/start-dfs.sh;/usr/local/Cellar/hadoop/2.6.0/sbin/start-yarn.sh"
alias hstop="/usr/local/Cellar/hadoop/2.6.0/sbin/stop-yarn.sh;/usr/local/Cellar/hadoop/2.6.0/sbin/stop-dfs.sh"

and execute

$ source ~/.profile

in the terminal to update.

Before we can run Hadoop we first need to format the HDFS using

$ hdfs namenode -format

SSH Localhost

Nothing needs to be done here if you have already generated ssh keys. To verify just check for the existance of ~/.ssh/id_rsa and the ~/.ssh/id_rsa.pub files. If not the keys can be generated using

$ ssh-keygen -t rsa

Enable Remote Login
“System Preferences” -> “Sharing”. Check “Remote Login”
Authorize SSH Keys
To allow your system to accept login, we have to make it aware of the keys that will be used

$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

Let’s try to login.

$ ssh localhost
> Last login: Fri Mar  6 20:30:53 2015
$ exit

Running Hadoop

Now we can run Hadoop just by typing

$ hstart

and stopping using

$ hstop

Download Examples

To run examples, Hadoop needs to be started.

Hadoop Examples 1.2.1 (Old) 
Hadoop Examples 2.6.0 (Current)

Test them out using:

$ hadoop jar <path to the hadoop-examples file> pi 10 100

Good to know

We can access the Hadoop web interface by connecting to

Resource Manager: http://localhost:50070
JobTracker: http://localhost:8088
Specific Node Information: http://localhost:8042

This we can use to access the HDFS filesystem, for any resulting output files.

Errors

To resolve ‘WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable’ (Stackoverflow.com)

Connection Refused after installing Hadoop

$ hdfs dfs -ls
> 15/03/06 20:13:54 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
> ls: Call From spaceship.local/192.168.1.65 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:   http://wiki.apache.org/hadoop/ConnectionRefused

The start-up scripts such as start-all.sh do not provide you with specifics about why the startups failed. Some of the time it won’t even notify you that a startup failed… To troubleshoot the service that isn’t functioning execute it manually.

$ hdfs namenode
> 15/03/06 20:18:31 WARN namenode.FSNamesystem: Encountered exception loading fsimage
org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /usr/local/Cellar/hadoop/hdfs/tmp/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible.
> 15/03/06 20:18:31 FATAL namenode.NameNode: Failed to start namenode.

and the problem is…

$ hadoop namenode -format

To verify the problem is fixed run

$ hstart
$ hdfs dfs -ls /

If ‘hdfs dfs -ls’ gives you a error

> ls: `.‘: No such file or directory

then we need to create the default directory structure Hadoop expects (ie. /user/whoami_output/)

$ whoami
> spaceship
$ hdfs dfs -mkdir -p /user/spaceship 
> 15/03/06 20:31:19 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
$ hdfs dfs -ls
> 15/03/06 20:31:23 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
$ hdfs dfs -put book.txt
> 15/03/06 20:32:29 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
$ hdfs dfs -ls 
> 15/03/06 20:32:50 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
> Found 1 items
> -rw-r--r--   1 marekbejda supergroup      29578 2015-03-06 20:32 book.txt

JPS and Nothing Works…

Seems like certain builds of Java 1.8 (i.e.. 1.8_40) are missing a critical package that breaks Yarn. Check your logs at

$ jps
> 5935 Jps
$ vim /usr/local/Cellar/hadoop/2.6.0/libexec/logs/yarn-*
> 2015-03-07 16:21:32,934 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in secureMain java.lang.NoClassDefFoundError: sun/management/ExtendedPlatformComponent
..
> 2015-03-07 16:21:32,937 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
> 2015-03-07 16:21:32,939 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:

http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-November/029818.html

Either downgrade to Java 1.7 or I’m currently running 1.8.0_20

$ java -version
> java version "1.8.0_20"
> Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
> Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)

Now that you have successfully setup and launch Hadoop it’s time to install Hbase. Similarly to Hadoop, you have two options to get Hbase. You can either go to the Hbase distribution site, choose a mirror close to your location and download it (then copy to $HD_HOME), or execute the following commands:

cd ~/Downloads
curl http://apache.websitebeheerjd.nl/hbase/stable/hbase-0.94.8.tar.gz > hbase-0.94.8.tar.gz
mv hbase-0.94.8.tar.gz $HD_HOME/
cd $HD_HOME
tar xvzf hbase-0.94.8.tar.gz
ln -s hbase-0.94.8 hbase
备注使用，省去很多事情

brew install hbase

Configuring Hbase is quite easy (a very basic instance), you need to modify only two files (located under $HBASE_HOME/conf).

The file hbase-env.sh sets the execution environment for Hbase. This file works the same way with as hadoop-env.sh for Hadoop. Add the following lines to hbase-env.sh:

Hbase properties are governed by the file hbase-site.xml. The only configuration parameter that you need to specify to make Hbase work is hbase.rootdir, the Hbase root directory. This directory can be either a local file file:/// or an HDFS instancehdfs://. In this particular case we are pointing Hbase to our newly installed HDFS instance. Other properties that can be set in this files can be found here.

Now you are ready to launch with Hbase. To start Hbase just execute the following command:

$HBASE_HOME/bin/start-hbase.sh

In order to test your Hbase installation, launch the Hbase shell and play with it (heavily inspired from http://hbase.apache.org/book/quickstart.html). To launch the Hbase shell execute the following command:

$HBASE_HOME/bin/hbase shell

You should be prompted to the Hbase interactive interpreter:

HBase Shell; enter ‘help‘ for list of supported commands.
Type "exit" to leave the HBase Shell
Version 0.94.8, r1485407, Wed May 22 20:53:13 UTC 2013

Create a new table and put new values on it:

hbase(main):003:0> create ‘test‘, ‘cf‘
0 row(s) in 1.2200 seconds
hbase(main):003:0> list ‘test‘
..
1 row(s) in 0.0550 seconds
hbase(main):004:0> put ‘test‘, ‘row1‘, ‘cf:a‘, ‘value1‘
0 row(s) in 0.0560 seconds
hbase(main):005:0> put ‘test‘, ‘row2‘, ‘cf:b‘, ‘value2‘
0 row(s) in 0.0370 seconds
hbase(main):006:0> put ‘test‘, ‘row3‘, ‘cf:c‘, ‘value3‘
0 row(s) in 0.0450 seconds

scan the table values:

hbase(main):007:0> scan ‘test‘
ROW        COLUMN+CELL
row1       column=cf:a, timestamp=1288380727188, value=value1
row2       column=cf:b, timestamp=1288380738440, value=value2
row3       column=cf:c, timestamp=1288380747365, value=value3
3 row(s) in 0.0590 seconds

get a value through its key:

hbase(main):008:0> get ‘test‘, ‘row1‘
COLUMN      CELL
cf:a        timestamp=1288380727188, value=value1
1 row(s) in 0.0400 seconds

disable and drop (delete) the table.

hbase(main):012:0> disable ‘test‘
0 row(s) in 1.0930 seconds
hbase(main):013:0> drop ‘test‘
0 row(s) in 0.0770 seconds 

If you could execute those commands successfully then your hbase instance is working properly.

http://localhost:60010/ Hbase master webui
http://localhost:60030/ Hbase region server webui

$HBASE_HOME/bin/stop-hbase.sh