Cassandra笔记--2. 安装

1. 从apache官网下载Cassandra，我用的版本是2.1.8。压缩包解压，这里的目录是D:cassandraapache-cassandra-2.1.8

2. 配置环境变量 
　　添加环境变量CASSANDRA_HOME，值为D:cassandraapache-cassandra-2.1.8，环境变量path后面添加%CASSANDRA_HOME%in

3. 修改配置文件 conf/cassandra.yaml

data_file_directories: D:cassandradata
commitlog_directory: D:cassandracommitlog
saved_caches_directory: D:cassandrasaved_caches

原来的是： 

# Directories where Cassandra should store data on disk.  Cassandra
# will spread data evenly across them, subject to the granularity of
# the configured compaction strategy.
# If not set, the default directory is $CASSANDRA_HOME/data/data.
# data_file_directories:
#     - /var/lib/cassandra/data

# commit log.  when running on magnetic HDD, this should be a
# separate spindle than the data directories.
# If not set, the default directory is $CASSANDRA_HOME/data/commitlog.
# commitlog_directory: /var/lib/cassandra/commitlog

# saved caches
# If not set, the default directory is $CASSANDRA_HOME/data/saved_caches.
# saved_caches_directory: /var/lib/cassandra/saved_caches

4. 修改conf/logback.xml

将${cassandra.logdir} 改为你想要存放的位置，我的是 D:cassandralogsystem.log

5.修改Cassandra.bat文件

找到下面这部分 

REM -----------------------------------------------------------------------------
REM JVM Opts we'll use in legacy run or installation
set JAVA_OPTS=-ea^
 -javaagent:"%CASSANDRA_HOME%libjamm-0.3.0.jar"^
 -Xms2G^
 -Xmx2G^
 -XX:+HeapDumpOnOutOfMemoryError^
 -XX:+UseParNewGC^
 -XX:+UseConcMarkSweepGC^
 -XX:+CMSParallelRemarkEnabled^
 -XX:SurvivorRatio=8^
 -XX:MaxTenuringThreshold=1^
 -XX:CMSInitiatingOccupancyFraction=75^
 -XX:+UseCMSInitiatingOccupancyOnly^
 -Dlogback.configurationFile=logback.xml^
 -Dcassandra.jmx.local.port=7199

修改-Xms2G^和-Xmx2G^为适合你机器的大小,我改为  -Xms512M^和Xmx512M^

如果上面不改，可能会由于内存不足而启动失败： 

Could not reserve enough space for 2097152KB object heap  

6. 启动

进入命令行，输入cassandra，看到下图则启动成功

参考资料： 

NoSql之旅--Cassandra安装篇(一): http://www.cnblogs.com/chyu/p/4600183.html

http://blog.csdn.net/maosijunzi/article/details/42120889

XP系统下安装Cassandra