南大通用数据库-Gbase-8a-学习-07-集群节点缩容（8.6版本）

一、测试环境

二、操作步骤

这里演示的步骤是同时卸载管理和数据节点。

1、查看集群状态

[root@localhost gcinstall]# gcadmin
CLUSTER STATE:  ACTIVE
CLUSTER MODE:   NORMAL

=====================================================================
|               GBASE COORDINATOR CLUSTER INFORMATION               |
=====================================================================
|   NodeName   |       IpAddress       |gcware |gcluster |DataState |
---------------------------------------------------------------------
| coordinator1 |    192.168.142.10     | OPEN  |  OPEN   |    0     |
---------------------------------------------------------------------
| coordinator2 |    192.168.142.11     | OPEN  |  OPEN   |    0     |
---------------------------------------------------------------------
=================================================================
|                GBASE DATA CLUSTER INFORMATION                 |
=================================================================
|NodeName |       IpAddress       |gnode |syncserver |DataState |
-----------------------------------------------------------------
|  node1  |    192.168.142.10     | OPEN |   OPEN    |    0     |
-----------------------------------------------------------------
|  node2  |    192.168.142.11     | OPEN |   OPEN    |    0     |
-----------------------------------------------------------------
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2、查看集群分布策略

[root@localhost gcinstall]# gcadmin showdistribution

              Distribution ID: 2 | State: new | Total segment num: 2

     Primary Segment Node IP                           Segment ID         Duplicate Segment node IP
========================================================================================================================
|    192.168.142.11                              |       1          |                                                  |
------------------------------------------------------------------------------------------------------------------------
|    192.168.142.10                              |       2          |                                                  |
========================================================================================================================
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记录一下分布ID：2后面需要用到。

3、修改策略配置文件

我们只留保留节点的信息，缩容节点的信息进行剔除。

[root@localhost gcinstall]# su - gbase
上一次登录：五 8月 12 09:21:47 CST 2022pts/4 上
[gbase@localhost ~]$ cd /opt/pkg/gcinstall/

[gbase@localhost gcinstall]$ vim gcChangeInfo.xml 

[gbase@localhost gcinstall]$ cat gcChangeInfo.xml 
<?xml version="1.0" encoding="utf-8"?>
<servers>
 <rack>
  <node ip="192.168.142.10"/>
 </rack>
</servers>
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4、策略重分布

新的策略ID是3。

[gbase@localhost gcinstall]$ gcadmin distribution gcChangeInfo.xml p 1 d 0
gcadmin generate distribution ...

[warning]: parameter [d num] is 0, the new distribution will has no segment backup
please ensure this is ok, input y or n: y
gcadmin generate distribution successful

[gbase@localhost gcinstall]$ gcadmin showdistribution

              Distribution ID: 3 | State: new | Total segment num: 1

     Primary Segment Node IP                           Segment ID         Duplicate Segment node IP
========================================================================================================================
|    192.168.142.10                              |       1          |                                                  |
========================================================================================================================

              Distribution ID: 2 | State: old | Total segment num: 2

     Primary Segment Node IP                           Segment ID         Duplicate Segment node IP
========================================================================================================================
|    192.168.142.11                              |       1          |                                                  |
------------------------------------------------------------------------------------------------------------------------
|    192.168.142.10                              |       2          |                                                  |
========================================================================================================================
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5、节点数据地图初始化

[gbase@localhost gcinstall]$ gccli 

GBase client 8.6.2.43-R33.132743. Copyright (c) 2004-2022, GBase.  All Rights Reserved.

gbase> 
gbase> initnodedatamap;
Query OK, 0 rows affected (Elapsed: 00:00:00.85)
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6、实例重分布

gbase>  rebalance instance;
Query OK, 2 rows affected (Elapsed: 00:00:00.46)
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7、查看数据重分布情况

gbase> select * from gclusterdb.rebalancing_status;
+------------------------------+------------+-------------------+----------+----------------------------+----------------------------+-----------+------------+----------+-----------------------+-----------------+
| index_name                   | db_name    | table_name        | tmptable | start_time                 | end_time                   | status    | percentage | priority | host                  | distribution_id |
+------------------------------+------------+-------------------+----------+----------------------------+----------------------------+-----------+------------+----------+-----------------------+-----------------+
| gclusterdb.audit_log_express | gclusterdb | audit_log_express |          | 2022-08-12 13:56:31.178000 | 2022-08-12 13:56:31.656000 | COMPLETED |        100 |        5 | ::ffff:192.168.142.10 |               3 |
| czg.czg                      | czg        | czg               |          | 2022-08-12 13:56:31.169000 | 2022-08-12 13:56:31.645000 | COMPLETED |        100 |        5 | ::ffff:192.168.142.10 |               3 |
+------------------------------+------------+-------------------+----------+----------------------------+----------------------------+-----------+------------+----------+-----------------------+-----------------+
2 rows in set (Elapsed: 00:00:00.00)
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8、查看是否有遗漏的表

如果有的话，进行rebalance table 库名.表名。

gbase> select * from gbase.table_distribution where data_distribution_id=2;
Empty set (Elapsed: 00:00:00.00)
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9、删除旧的节点数据地图

gbase> refreshnodedatamap drop 2;
Query OK, 0 rows affected (Elapsed: 00:00:00.83)
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10、删掉旧的分布策略

[gbase@localhost gcinstall]$ gcadmin rmdistribution 2
cluster distribution ID [2]
it will be removed now
please ensure this is ok, input y or n: y
gcadmin remove distribution [2] success
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11、删除缩容完的数据节点注册信息

里面存放已经缩容完的数据节点信息。

[gbase@localhost gcinstall]$ cat gcChangeInfo.xml 
<?xml version="1.0" encoding="utf-8"?>
<servers>
 <rack>
  <node ip="192.168.142.11"/>
 </rack>
</servers>

[gbase@localhost gcinstall]$  gcadmin rmnodes  gcChangeInfo.xml 
gcadmin remove nodes ...

node [192.168.142.11] had been removed

gcadmin rmnodes success
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12、停止所有节点服务

所有节点都要执行。

[root@localhost ~]# service gcware stop
Stopping GCMonit success!
Signaling GCRECOVER (gcrecover) to terminate:              [  确定  ]
Waiting for gcrecover services to unload:....              [  确定  ]
Signaling GCSYNC (gc_sync_server) to terminate:            [  确定  ]
Waiting for gc_sync_server services to unload:             [  确定  ]
Signaling GCLUSTERD  to terminate:                         [  确定  ]
Waiting for gclusterd services to unload:........          [  确定  ]
Signaling GBASED  to terminate:                            [  确定  ]
Waiting for gbased services to unload:............         [  确定  ]
Signaling GCWARE (gcware) to terminate:                    [  确定  ]
Waiting for gcware services to unload:..                   [  确定  ]
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13、卸载缩容节点的数据库服务

coordinateHost 写要卸载的管理节点ip，
dataHost 写要卸载的数据节点ip，
existCoordinateHost写要保留的管理节点ip，
existDataHost写要保留的数据节点ip。

[gbase@localhost gcinstall]$ cat demo.options 
installPrefix= /opt
coordinateHost = 192.168.142.11
coordinateHostNodeID = 234,235,237
dataHost = 192.168.142.11
existCoordinateHost = 192.168.142.10
existDataHost = 192.168.142.10
loginUser= root
loginUserPwd = 'qwer1234'
#loginUserPwdFile = loginUserPwd.json
dbaUser = gbase
dbaGroup = gbase
dbaPwd = 'gbase'
rootPwd = 'qwer1234'
#rootPwdFile = rootPwd.json
dbRootPwd = ''
#mcastAddr = 226.94.1.39
mcastPort = 5493
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[gbase@localhost gcinstall]$ ./unInstall.py --silent=demo.options


These GCluster nodes will be uninstalled.
CoordinateHost:
192.168.142.11
DataHost:
192.168.142.11
Are you sure to uninstall GCluster ([Y,y]/[N,n])? y
192.168.142.11 	UnInstall 192.168.142.11 successfully.
Update all coordinator corosync conf.
192.168.142.10 update corosync conf successfully.
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14、各节点启动数据库服务

各节点都要执行。

[root@localhost ~]# service gcware start
Starting GCWARE (gcwexec):                                 [  确定  ]
Starting GBASED    :                                       [  确定  ]
Starting GCSYNC :                                          [  确定  ]
Starting GCLUSTERD :                                       [  确定  ]
Starting GCRECOVER :                                       [  确定  ]
Starting GCMonit success!
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15、查看集群是否缩容成功

只剩下一个节点，缩容成功。

[gbase@localhost gcinstall]$ gcadmin
CLUSTER STATE:  ACTIVE
CLUSTER MODE:   NORMAL

=====================================================================
|               GBASE COORDINATOR CLUSTER INFORMATION               |
=====================================================================
|   NodeName   |       IpAddress       |gcware |gcluster |DataState |
---------------------------------------------------------------------
| coordinator1 |    192.168.142.10     | OPEN  |  OPEN   |    0     |
---------------------------------------------------------------------
=================================================================
|                GBASE DATA CLUSTER INFORMATION                 |
=================================================================
|NodeName |       IpAddress       |gnode |syncserver |DataState |
-----------------------------------------------------------------
|  node1  |    192.168.142.10     | OPEN |   OPEN    |    0     |
-----------------------------------------------------------------
[gbase@localhost gcinstall]$ gcadmin showdistribution

              Distribution ID: 3 | State: new | Total segment num: 1

     Primary Segment Node IP                           Segment ID         Duplicate Segment node IP
========================================================================================================================
|    192.168.142.10                              |       1          |                                                  |
========================================================================================================================
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三、小知识点

1、只缩容数据节点

如果大家只缩容数据节点，在二、13中只写dataHost，不写coordinateHost ，其他的内容和上面的例子不变。

2、只缩容管理节点

（1）查看集群状态

[root@localhost ~]# gcadmin
CLUSTER STATE:  ACTIVE
CLUSTER MODE:   NORMAL

=====================================================================
|               GBASE COORDINATOR CLUSTER INFORMATION               |
=====================================================================
|   NodeName   |       IpAddress       |gcware |gcluster |DataState |
---------------------------------------------------------------------
| coordinator1 |    192.168.142.10     | OPEN  |  OPEN   |    0     |
---------------------------------------------------------------------
| coordinator2 |    192.168.142.11     | OPEN  |  OPEN   |    0     |
---------------------------------------------------------------------
=================================================================
|                GBASE DATA CLUSTER INFORMATION                 |
=================================================================
|NodeName |       IpAddress       |gnode |syncserver |DataState |
-----------------------------------------------------------------
|  node1  |    192.168.142.10     | OPEN |   OPEN    |    0     |
-----------------------------------------------------------------
|  node2  |    192.168.142.11     | OPEN |   OPEN    |    0     |
-----------------------------------------------------------------
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（2）停止集群

各节点执行

[root@localhost ~]# service gcware stop
Stopping GCMonit success!
Signaling GCRECOVER (gcrecover) to terminate:              [  确定  ]
Waiting for gcrecover services to unload:...               [  确定  ]
Signaling GCSYNC (gc_sync_server) to terminate:            [  确定  ]
Waiting for gc_sync_server services to unload:             [  确定  ]
Signaling GCLUSTERD  to terminate:                         [  确定  ]
Waiting for gclusterd services to unload:.....             [  确定  ]
Signaling GBASED  to terminate:                            [  确定  ]
Waiting for gbased services to unload:..                   [  确定  ]
Signaling GCWARE (gcware) to terminate:                    [  确定  ]
Waiting for gcware services to unload:.                    [  确定  ]
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（3）修改配置文件

注释dataHost。
coordinateHost 写需要卸载的管理节点IP。
existCoordinateHost 写需要存在的管理节点IP。
existDataHost 写需要存在的数据节点IP。

[gbase@localhost gcinstall]$ cat demo.options 
installPrefix= /opt
coordinateHost = 192.168.142.11
coordinateHostNodeID = 234,235,237
#dataHost = 192.168.142.11
existCoordinateHost = 192.168.142.10
existDataHost = 192.168.142.10,192.168.142.11
loginUser= root
loginUserPwd = 'qwer1234'
#loginUserPwdFile = loginUserPwd.json
dbaUser = gbase
dbaGroup = gbase
dbaPwd = 'gbase'
rootPwd = 'qwer1234'
#rootPwdFile = rootPwd.json
dbRootPwd = ''
#mcastAddr = 226.94.1.39
mcastPort = 5493
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（4）卸载管理节点

[gbase@localhost gcinstall]$ ./unInstall.py --silent=demo.options


These GCluster nodes will be uninstalled.
CoordinateHost:
192.168.142.11
DataHost:
Are you sure to uninstall GCluster ([Y,y]/[N,n])? y
192.168.142.11 	UnInstall 192.168.142.11 successfully.
Update all coordinator corosync conf.
192.168.142.10 update corosync conf successfully.
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（5）启动集群服务

每个节点都执行。

[root@localhost gcinstall]# service gcware start 
Starting GCWARE (gcwexec):                                 [  确定  ]
Starting GBASED    :                                       [  确定  ]
Starting GCSYNC :                                          [  确定  ]
Starting GCLUSTERD :                                       [  确定  ]
Starting GCRECOVER :                                       [  确定  ]
Starting GCMonit success!
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（6）查看集群状态

管理节点变为一个，卸载成功。

[root@localhost gcinstall]# gcadmin
CLUSTER STATE:  ACTIVE
CLUSTER MODE:   NORMAL

=====================================================================
|               GBASE COORDINATOR CLUSTER INFORMATION               |
=====================================================================
|   NodeName   |       IpAddress       |gcware |gcluster |DataState |
---------------------------------------------------------------------
| coordinator1 |    192.168.142.10     | OPEN  |  OPEN   |    0     |
---------------------------------------------------------------------
=================================================================
|                GBASE DATA CLUSTER INFORMATION                 |
=================================================================
|NodeName |       IpAddress       |gnode |syncserver |DataState |
-----------------------------------------------------------------
|  node1  |    192.168.142.10     | OPEN |   OPEN    |    0     |
-----------------------------------------------------------------
|  node2  |    192.168.142.11     | OPEN |   OPEN    |    0     |
-----------------------------------------------------------------
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