GBase 8a支持通过uninstall.py卸载集群，但如果所有的管理、调度节点都卸载了，则所有的数据节点必须全部卸载，否则就会报can not remove all coordinator nodes without remove all data nodes, please check your config的错误。
目录导航
报错样例
[gbase@gbase_rh7_003 gcinstall]$ ./unInstall.py --silent=demo.options
Error: unInstall.py(line 821) -- can not remove all coordinator nodes without remove all data nodes, please check your config.
原因
查看demo.options，数据节点配置了103，104，105共三个
[gbase@gbase_rh7_003 gcinstall]$ cat demo.options
installPrefix= /opt/gbase
coordinateHost = 10.0.2.103
coordinateHostNodeID = 103
dataHost = 10.0.2.103,10.0.2.104,10.0.2.105
#existCoordinateHost =
#existDataHost =
#existGcwareHost=
gcwareHost = 10.0.2.103
gcwareHostNodeID = 103
dbaUser = gbase
dbaGroup = gbase
dbaPwd = 'gbase1234'
rootPwd = ''
#rootPwdFile = rootPwd.json
#characterSet = utf8
#dbPort = 5258
#sshPort = 22
查看集群状态，发现管理和调度只有1个，数据节点有4个 103到106.
[gbase@gbase_rh7_003 log]$ gcadmin
CLUSTER STATE: ACTIVE
VIRTUAL CLUSTER MODE: NORMAL
====================================
| GBASE GCWARE CLUSTER INFORMATION |
====================================
| NodeName | IpAddress | gcware |
------------------------------------
| gcware1 | 10.0.2.103 | OPEN |
------------------------------------
====================================================
| GBASE COORDINATOR CLUSTER INFORMATION |
====================================================
| NodeName | IpAddress | gcluster | DataState |
----------------------------------------------------
| coordinator1 | 10.0.2.103 | OPEN | 0 |
----------------------------------------------------
=========================================================================================================
| GBASE DATA CLUSTER INFORMATION |
=========================================================================================================
| NodeName | IpAddress | DistributionId | gnode | syncserver | DataState |
---------------------------------------------------------------------------------------------------------
| node1 | 10.0.2.103 | 2 | OPEN | OPEN | 0 |
---------------------------------------------------------------------------------------------------------
| node2 | 10.0.2.104 | 2 | OPEN | OPEN | 0 |
---------------------------------------------------------------------------------------------------------
| node3 | 10.0.2.105 | 2 | OPEN | OPEN | 0 |
---------------------------------------------------------------------------------------------------------
| node4 | 10.0.2.106 | 2 | OPEN | OPEN | 0 |
---------------------------------------------------------------------------------------------------------
解决
在卸载配置文件里，填写完整的数据节点IP。 既然所有管理和数据都卸载了，则所有的数据节点也就没有保留的意义。这不是缩容，而是全部卸载。
[gbase@gbase_rh7_003 gcinstall]$ vi demo.options
[gbase@gbase_rh7_003 gcinstall]$ cat demo.options
installPrefix= /opt/gbase
coordinateHost = 10.0.2.103
coordinateHostNodeID = 103
dataHost = 10.0.2.103,10.0.2.104,10.0.2.105,10.0.2.106
#existCoordinateHost =
#existDataHost =
#existGcwareHost=
gcwareHost = 10.0.2.103
gcwareHostNodeID = 103
dbaUser = gbase
dbaGroup = gbase
dbaPwd = 'gbase1234'
rootPwd = ''
#rootPwdFile = rootPwd.json
#characterSet = utf8
#dbPort = 5258
#sshPort = 22
再次执行卸载，成功卸载。
[gbase@gbase_rh7_003 gcinstall]$ ./unInstall.py --silent=demo.options
These GCluster nodes will be uninstalled.
CoordinateHost:
10.0.2.103
DataHost:
10.0.2.103 10.0.2.104 10.0.2.105 10.0.2.106
GcwareHost:
10.0.2.103
Are you sure to uninstall GCluster ([Y,y]/[N,n])? y
unInstall 10.0.2.103 's gcware successfully.
unInstall 10.0.2.103 's coordinate successfully.
unInstall 10.0.2.103 's data successfully.
unInstall 10.0.2.104 's data successfully.
unInstall 10.0.2.105 's data successfully.
unInstall 10.0.2.106 's data successfully.
[gbase@gbase_rh7_003 gcinstall]$