【产品名称】OceanBase数据库
【产品版本】3.1.2
【问题描述】咨询一下，看系统架构图一个zone有多个observer。但是默认自己部署的好像只有一个，这个是需要怎么配么？什么时候会用到多个observer
## Only need to configure when remote login is required
user:
username: root
password: A@123456
oceanbase-ce:
servers:
- name: z1_01
# Please don't use hostname, only IP can be supported
ip: 172.22.51.132
- name: z1_02
ip: 172.22.51.133
- name: z2_01
ip: 172.22.51.134
- name: z2_02
ip: 172.22.51.135
- name: z3_01
ip: 172.22.51.136
- name: z3_02
ip: 172.22.51.137
global:
# Please set devname as the network adaptor's name whose ip is in the setting of severs.
# if set severs as "127.0.0.1", please set devname as "lo"
# if current ip is 192.168.1.10, and the ip's network adaptor's name is "eth0", please use "eth0"
devname: eth0
cluster_id: 1
# please set memory limit to a suitable value which is matching resource.
memory_limit: 8G
system_memory: 4G
stack_size: 512K
cpu_count: 16
cache_wash_threshold: 1G
__min_full_resource_pool_memory: 268435456
workers_per_cpu_quota: 10
schema_history_expire_time: 1d
# The value of net_thread_count had better be same as cpu's core number.
net_thread_count: 4
major_freeze_duty_time: Disable
minor_freeze_times: 10
enable_separate_sys_clog: 0
enable_merge_by_turn: FALSE
datafile_disk_percentage: 20
syslog_level: INFO
enable_syslog_recycle: true
max_syslog_file_count: 4
# observer cluster name, consistent with obproxy's cluster_name
appname: ob_cluster
root_password: # root user password, can be empty
proxyro_password: # proxyro user pasword, consistent with obproxy's observer_sys_password, can be empty
z1_01:
mysql_port: 2881
rpc_port: 2882
home_path: /root/observer
zone: zone1
z1_02:
mysql_port: 2881
rpc_port: 2882
home_path: /root/observer
zone: zone1
z2_01:
mysql_port: 2881
rpc_port: 2882
home_path: /root/observer
zone: zone2
z2_02:
mysql_port: 2881
rpc_port: 2882
home_path: /root/observer
zone: zone2
z3_01:
mysql_port: 2881
rpc_port: 2882
home_path: /root/observer
zone: zone3
z3_02:
mysql_port: 2881
rpc_port: 2882
home_path: /root/observer
zone: zone3
obproxy:
servers:
- 172.22.51.138
global:
listen_port: 2883
prometheus_listen_port: 2884
home_path: /root/obproxy
# oceanbase root server list
# format: ip:mysql_port,ip:mysql_port
rs_list: 172.22.51.132:2881;172.22.51.133:2881;172.22.51.134:2881;172.22.51.135:2881;172.22.51.136:2881;172.22.51.137:2881
enable_cluster_checkout: false
# observer cluster name, consistent with oceanbase-ce's appname
cluster_name: ob_cluster
obproxy_sys_password: # obproxy sys user password, can be empty
observer_sys_password: # proxyro user pasword, consistent with oceanbase-ce's proxyro_password, can be empty
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"什么时候需要多个observer?"
扩容可以给已有的zone新增observer，也可以新增zone（一般很少，毕竟需要多一个机房，成本高）。
给已有的zone扩容的的场景，比如容量不足、单机的partition数量过多
OB以集群形态部署，提供给业务使用的是集群中分配出来的租户(逻辑实例)。集群架构是M-M-M，租户架构是N-N-N，M≥N≥1。集群里可以有多个租户，都符合这个特点。多租户瓜分集群的资源(cpu和内存)。集群资源不够了就扩容(加节点，就是加observer)。
您好，租户架构是N-N-N是什么意思？
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在一个zone内控制unit_num的数量，不能大于zone内observer的节点数量。否则会报：
ERROR 4656 (HY000): resource pool unit num is bigger than zone server count
这里的N应该是表示zone内分配的unit_num数量，不能大于zone内observer的节点，否则会报：
ERROR 4656 (HY000): resource pool unit num is bigger than zone server count
这里的N应该是表示资源池里unit_num的数量，不能大于zone内observer的节点数量，否则会提示：resource pool unit num is bigger than zone server count
这里的N应该是表示资源池里unit_num的数量，不能大于zone内observer的节点数量(M)。
那怎么查看这个N和M值
每个计算点启动一个observer，当有多台服务就需要多个observer。