部署两节点cassandra集群

部署两节点cassandra集群确保系统已安装jdk，可不配置JAVA环境变量cassandra版本：apache-cassandra-1.1.5jdk版本：jdk1.6.0_381、cassandra日志路径#vimlog4j-s

部署两节点cassandra集群

确保系统已安装jdk，虚拟主机，可不配置JAVA环境变量

cassandra版本：apache-cassandra-1.1.5

jdk版本：jdk1.6.0_38

1、cassandra 日志路径

#vim log4j-server.properties

log4j.appender.R.File=/trs6/cassandra/logs/system.log

2、cassandra 内存使用 (HEAP_NEWSIZE)=1/4(MAX_HEAP_SIZE)

#vim cassandra-env.sh

MAX_HEAP_SIZE="4G"

HEAP_NEWSIZE="800M"

3、cassandra 集群配置

#vim cassandra.yaml

cluster_name: 'pis'    //集群名称

initial_token: 0    //由initial_token.py生成

#!/usr/bin/env python

import sys

if (len(sys.argv) > 1):

        num=int(sys.argv[1])

else:

        num=int(raw_input("How many nodes are in your cluster? "))

for i in range(0, num):

        print 'node %d: %d' % (i, (i*(2**127)/num))

data_file_directories:

    - /trs6/cassandra/data    //data存储目录

commitlog_directory: /trs6/cassandra/commitlog     //commit日志目录

saved_caches_directory: /trs6/cassandra/saved_cache  //cache存储目录

- seeds: "192.168.183.71,192.168.183.72"     //种子节点IP

listen_address: 192.168.183.71    //监听地址->本机IP

rpc_address: 192.168.183.71

endpoint_snitch: SimpleSnitch

4、启动集群

#bin/cassandra

5、查看集群状态

#bin/nodetool -h 192.168.183.71 ring

Address         DC          Rack        Status State   Load            Effective-Ownership Token                                       

                                                                                           85070591730234615865843651857942052864      

192.168.183.71  datacenter1 rack1       Up     Normal  23.61 KB        50.00%              0                                           

192.168.183.72  datacenter1 rack1       Up     Normal  23.61 KB        50.00%              85070591730234615865843651857942052864

6、交互式命令行 （分号结尾）

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[root@cas1 ~]# bin/cassandra-cli -h 192.168.183.71

Connected to: "pis" on 192.168.183.71/9160

Welcome to Cassandra CLI version 1.1.5

Type 'help;' or '?' for help.

Type 'quit;' or 'exit;' to quit.

（1）创建keyspace

[default@unknown] create keyspace DEMO;

5210d4ac-24e2-37e1-8d38-13a3cab24f33

Waiting for schema agreement...

... schemas agree across the cluster

（2）认证使用keyspace

[default@unknown] use DEMO;

Authenticated to keyspace: DEMO

（3）创建column family

[default@DEMO] create column family Users                

...with key_validation_class = 'UTF8Type'    

...and comparator = 'UTF8Type'               

...and default_validation_class = 'UTF8Type';

8618bf72-4e3d-3b7c-84f6-031e69e7d161

Waiting for schema agreement...

... schemas agree across the cluster

（4）存储数据到column family

[default@DEMO] set Users[1234][name] = tianxin;

Value inserted.

Elapsed time: 87 msec(s).

[default@DEMO] set Users[1234][password] = upgirl; 

Value inserted.

Elapsed time: 28 msec(s).

（5）获取数据

[default@DEMO] get Users[1234];

=> (column=name, value=tianxin, timestamp=1362521480914000)

=> (column=password, value=upgirl, timestamp=1362521498155000)

Returned 2 results.

Elapsed time: 131 msec(s).

遇到的问题：

1、启动cassandra时，报错 Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: cas1: cas1

原因：集群节点必须配置主机名的解析

2、创建keyspace时，香港空间，报错 The schema has not settled in 10 seconds; further migrations are ill-advised until it does.

Versions are e71db6f5-eb85-3555-b851-1878497cf194:[198.216.27.72],eceb06f2-03a1-3bf8-a421-2528a053d7e6:[198.216.27.71]

原因：集群节点间时间不同步

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