一、Cassandra
1、启动Cassandra
bin/cassandra
2、关闭Cassandra
bin/nodetool stopdaemon
3、查看状态
bin/nodetool status
4、使用Cql
bin/cqlsh
- 查看keyspaces
cqlsh> describe keyspaces;
- 删除keyspaces
cqlsh>drop keyspace hugegraph
二、Cassandra集群搭建
1、安装jdk,关闭防火墙
2、下载cassandra安装包,上传到服务器 /app目录,解压,重命名
cd /app
tar -zxvf apache-cassandra-3.11.9-bin.tar.gz
mv apache-cassandra-3.11.9-bin cassandra
3、修改cassandra配置文件
vi /app/cassandra/conf/cassandra.yml
#修改项
hists_directory: /var/lib/cassandra/hints
data_file_directories:
- /var/lib/cassandra/data1
commitlog_directory: /var/lib/cassandra/commitlog
saved_caches_directory: /var/lib/cassandra/saved_caches
seed_provider:
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
- seeds: "10.10.171.159"
listen_address: 10.10.171.157
rpc_address: 0.0.0.0
boardcast_rpc_address: 10.10.171.157
4、打包cassandra目录,scp至另一台服务器
zip -r /app/cassandra.zip /app/cassandra
scp /app/cassandra.zip 10.10.171.159:/app
5、在另一台服务器解压目录,修改配置文件
cd /opt
unzip cassandra.zip
vi /opt/cassandra/conf/cassandra.yml
#修改项
hists_directory: /var/lib/cassandra/hints
data_file_directories:
- /var/lib/cassandra/data1
commitlog_directory: /var/lib/cassandra/commitlog
saved_caches_directory: /var/lib/cassandra/saved_caches
seed_provider:
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
- seeds: "10.10.171.159"
listen_address: 10.10.171.159
rpc_address: 0.0.0.0
boardcast_rpc_address: 10.10.171.159
6、先从159(seed节点)启动,再启动另一台157
cd /app/cassandra
bin/cassandra -p
7、查看状态,启动成动
[root@bba cassandra]# bin/nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns (effective) Host ID Rack
UN 10.10.171.158 418.35 KB 256 48.8% 83ee77bc-6084-4236-bb92-4c45466aae08 rack1
UN 10.10.171.159 1.27 MB 256 51.2% 9a82514c-bff0-4d62-b126-00d99c8853a6 rack1
三、报错处理
对于大部分的报错,我们能做的就是修改 conf/cassandra.yml,然后重新启动 cassandra
1、# Fail any batch exceeding this value. 50kb (10x warn threshold) by default.
Caused by: com.baidu.hugegraph.exception.ServerException$ServerCause: com.datastax.driver.core.exceptions.InvalidQueryException: Batch too large
batch_size_fail_threshold_in_kb: 50
write_request_timeout_in_ms: 20000