Casssandra常用命令、集群搭建及运行报错处理

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

参考网址：https://blog.csdn.net/cyy298/article/details/112917084?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-0&spm=1001.2101.3001.4242

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

四、优化

参考网址：https://blog.51cto.com/eric100/1770036