以下若是用 hadoop@Cluster0X:~ 代表 Cluster01 ~ Cluster02 都要做的.
参考资料1：HadoopDB Quick Start Guide
2 各节点安裝设置 PostgreSQL：
安裝并为数据库建立 hadoop 帐号，假定使用密碼为 1234 hadoop@Cluster0X:~$ sudo apt-get install postgresql hadoop@Cluster0X:~$ sudo vim /etc/postgresql/8.4/main/pg_hba.conf #local all all identlocal all all trust
# IPv4 local connections:
#host all all 127.0.0.1/32 md5
host all all 127.0.0.1/32 password
host all all 192.168.0.1/24 password # 加上Cluster 機器 IP 範圍
# IPv6 local connections:
#host all all ::1/128 md5
host all all ::1/128 password hadoop@Cluster0X:~$ sudo /etc/init.d/postgresql-8.4 restart hadoop@Cluster0X:~$ sudo su - postgres postgres@Cluster0X:~$ createuser hadoop Shall the new role be a superuser? (y/n) y
postgres@Cluster01:~$ psql
psql (8.4.2)
Type "help" for help.
postgres=# alter user hadoop with password '1234';
ALTER ROLE
postgres=# /q 測試其他機器可否連線 hadoop@Cluster01:~$ createdb testdb hadoop@Cluster02:~$ psql -h Cluster01 testdb
如果能够连接上，则出现以下提示： 口令:
psql (8.4.2)
SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
Type "help" for help.
testdb=#
3 设置HadoopDB
首先从下载hadoopdb，解压后，其中包含hadoopdb.jar。
然后再从下载postgresql-8.4-701.jdbc4.jar。
hadoop@Cluster0X:~$ cp hadoopdb.jar HADOOP_HOME/lib/ hadoop@Cluster0X:~$ cp postgresql-8.4-701.jdbc4.jar HADOOP_HOME/lib/ hadoop@Cluster0X:~$ vim HADOOP_HOME/conf/core-site.xml core-site.xml 文件中添加以下内容：<property>
<name>hadoopdb.config.file</name>
<value>HadoopDB.xml</value>
<description>The name of the HadoopDB cluster configuration file</description>
</property>
<property>
<name>hadoopdb.fetch.size</name>
<value>1000</value>
<description>The number of records fetched from JDBC ResultSet at once</description>
</property>
<property>
<name>hadoopdb.config.replication</name>
<value>false</value>
<description>Tells HadoopDB Catalog whether replication is enabled.
Replica locations need to be specified in the catalog.
False causes replica information to be ignored.</description>
</property> hadoop@Cluster01:~$ vim nodes.txt 将集群中的所有节点IP写入此文件：
192.168.0.1 192.168.0.2 hadoop@Cluster01:~$ vim Catalog.properties #Properties for Catalog Generation
##################################
nodes_file=nodes.txt
# Relations Name and Table Name are the same
relations_unchunked=raw
relations_chunked=poi
catalog_file=HadoopDB.xml
##
#DB Connection Parameters
##
port=5432
username=hadoop
password=1234
driver=org.postgresql.Driver
url_prefix=jdbc/:postgresql/://
##
#Chunking properties
##
# the number of databases on a node
chunks_per_node=2
# for udb0 ,udb1 ( 2 nodes = 0 ~ 1 )
unchunked_db_prefix=udb
# for cdb0 ,cdb1, ... , cdb5 (2 nodes x 3 chunks = 0~5 )
chunked_db_prefix=cdb
##
#Replication Properties
##
dump_script_prefix=/root/dump_
replication_script_prefix=/root/load_replica_
dump_file_u_prefix=/mnt/dump_udb
dump_file_c_prefix=/mnt/dump_cdb
##
#Cluster Connection
##
ssh_key=id_rsa-gsg-keypair hadoop@Cluster01:~$ java -cp lib/hadoopdb.jar edu.yale.cs.hadoopdb.catalog.SimpleCatalogGenerator Catalog.properties 产生的 HadoopDB.xml 类似下面： <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<DBClusterConfiguration xmlns="">
<Nodes Password="1234" Username="hadoop" Driver="org.postgresql.Driver" Location=" 192.168.0.1 ">
<Relations>
<Partitions url="jdbc:postgresql:// 192.168.0.1 :5432/udb0"/>
</Relations>
<Relations>
<Partitions url="jdbc:postgresql:// 192.168.0.1 :5432/cdb0"/>
<Partitions url="jdbc:postgresql:// 192.168.0.1 :5432/cdb1"/>
</Relations>
</Nodes>
<Nodes Password="1234" Username="hadoop" Driver="org.postgresql.Driver" Location=" 192.168.0.2 ">
<Relations>
<Partitions url="jdbc:postgresql:// 192.168.0.2 :5432/udb1"/>
</Relations>
<Relations>
<Partitions url="jdbc:postgresql:// 192.168.0.2 :5432/cdb2"/>
<Partitions url="jdbc:postgresql:// 192.168.0.2 :5432/cdb3"/>
</Relations>
</Nodes>
</DBClusterConfiguration> 将HadoopDB.xml放入HDFS中： hadoop@Cluster01:~$ hadoop dfs -put HadoopDB.xml HadoopDB.xml