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Cassandra 安裝與測試
</big></big></big></div> <div style="text-align: center; color:#7E2217"><big style="font-weight: bold;"><big>
 0.8.1
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[[PageOutline]]


 == 1. download  ==
下載 bin 版如 [http://ftp.twaren.net/Unix/Web/apache//cassandra/0.8.1/apache-cassandra-0.8.1-bin.tar.gz  apache-cassandra-0.8.1-bin.tar.gz]

 == 2. single setup ==

{{{
mkdir /opt/cassandra/run
}}}

 * 修改 bin/cassandra.in.sh
{{{
#!text
JAVA_HOME=/usr/lib/jvm/java-6-sun
CASSANDRA_HOME=/opt/cassandra
}}}

 * 修改 conf/cassandra-env.sh
{{{
#!text
max_heap_size_in_mb=1024
}}}

 * 修改 conf/log4j-server.properties
{{{
#!text
log4j.appender.R.File=/opt/cassandra/run/system.log
}}}

 * 修改 conf/cassandra.yaml
{{{
#!text
data_file_directories: /opt/cassandra/run/data
commitlog_directory: /opt/cassandra/run/commitlog
saved_caches_directory: /opt/cassandra/run/saved_caches
}}}

 == 3. run ==

{{{
bin/cassandra  
...(程序跑於背景)

bin/cassandra-cli
[default@unknown] (進入指令交談模式)
}}}

 == 4. 操作 ==
{{{
create keyspace Keyspace1;

use Keyspace1;

create column family Users with comparator=UTF8Type and default_validation_class=UTF8Type and key_validation_class=UTF8Type;

set Users[jsmith][first] = 'John';

set Users[jsmith][last] = 'Smith';

set Users[jsmith][age] = long(42);

get Users[jsmith];
}}}

{{{
#!text
  set Users[jsmith][first] = 'John';
        \      \        \          \
         \      \_ key   \          \_ value
          \               \_ column
           \_ column family

}}}


== ps. 注意 ==

 * Cassandra0.6.x 以後版本，預設相容於 Hadoop0.20.x 
 * thrift
 * hadoop 
 * json