说明
本文仅从功能验证角度来进行流程操作，gbase v952 兼容模式对混合节点和纯data节点缩容。
缩容目标
集群目前有四个节点，两个管理节点，四个data节点，其中两台机器是混合部署。现在准备缩容一台混合节点一台纯data节点。
集群现状gcadmi信息如下：
[gbase@node1 gcinstall]$ gcadmin CLUSTER STATE: ACTIVE VIRTUAL CLUSTER MODE: NORMAL ================================================================= | GBASE COORDINATOR CLUSTER INFORMATION | ================================================================= | NodeName | IpAddress | gcware | gcluster | DataState | ----------------------------------------------------------------- | coordinator1 | 192.168.110.21 | OPEN | OPEN | 0 | ----------------------------------------------------------------- | coordinator2 | 192.168.110.22 | OPEN | OPEN | 0 | ----------------------------------------------------------------- ========================================================================================================= | GBASE DATA CLUSTER INFORMATION | ========================================================================================================= | NodeName | IpAddress | DistributionId | gnode | syncserver | DataState | --------------------------------------------------------------------------------------------------------- | node1 | 192.168.110.21 | 1 | OPEN | OPEN | 0 | --------------------------------------------------------------------------------------------------------- | node2 | 192.168.110.22 | 1 | OPEN | OPEN | 0 | --------------------------------------------------------------------------------------------------------- | node3 | 192.168.110.23 | 1 | OPEN | OPEN | 0 | --------------------------------------------------------------------------------------------------------- | node4 | 192.168.110.24 | 1 | OPEN | OPEN | 0 | ---------------------------------------------------------------------------------------------------------对192.168.110.22，192.168.110.23进行缩容，一个混合节点，一个纯data节点。
创建新的distribution
[gbase@node1 gcinstall]$ gcadmin distribution gcChangeInfo_20240221.xml p 1 d 1 gcadmin generate distribution ... gcadmin generate distribution successful [gbase@node1 gcinstall]$测试环境仅剩2个节点，不能p 2了，生产环境要注意主备分片数量。
检查新的distribution
[gbase@node1 gcinstall]$ gcadmin showdistribution Distribution ID: 2 | State: new | Total segment num: 2 Primary Segment Node IP Segment ID Duplicate Segment node IP ======================================================================================================================== | 192.168.110.21 | 1 | 192.168.110.24 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.24 | 2 | 192.168.110.21 | ======================================================================================================================== Distribution ID: 1 | State: old | Total segment num: 8 Primary Segment Node IP Segment ID Duplicate Segment node IP ======================================================================================================================== | 192.168.110.21 | 1 | 192.168.110.22 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.22 | 2 | 192.168.110.23 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.23 | 3 | 192.168.110.24 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.24 | 4 | 192.168.110.21 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.21 | 5 | 192.168.110.23 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.22 | 6 | 192.168.110.24 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.23 | 7 | 192.168.110.21 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.24 | 8 | 192.168.110.22 | ========================================================================================================================目前已经可以看到两个distribution，其中新的只有21和24
初始化hashmap
[gbase@node1 ~]$ gccli -uroot GBase client 9.5.2.45.7_patch.10350d612. Copyright (c) 2004-2024, GBase. All Rights Reserved. gbase> initnodedatamap; Query OK, 1 row affected, 30 warnings (Elapsed: 00:00:02.46)设置重分布rebalance并行度为0
gbase> set global gcluster_rebalancing_concurrent_count = 0; Query OK, 0 rows affected (Elapsed: 00:00:00.03) gbase> gbase> show variables like 'gcluster_rebalancing_concurrent_count'; +---------------------------------------+-------+ | Variable_name | Value | +---------------------------------------+-------+ | gcluster_rebalancing_concurrent_count | 0 | +---------------------------------------+-------+ 1 row in set (Elapsed: 00:00:00.00)初始化rebalance
gbase> rebalance instance; Query OK, 13 rows affected (Elapsed: 00:00:00.32)验证gclusterdb.rebalancing_status，测试环境暂时不需要调重分布整优先级
gbase> select count(1) from gclusterdb.rebalancing_status; +----------+ | count(1) | +----------+ | 13 | +----------+ 1 row in set (Elapsed: 00:00:00.03) gbase> select * from gclusterdb.rebalancing_status;gclusterdb.rebalancing_status表中可以修改重分布优先级这里不进行详细说明
开始重分布
gbase> set global gcluster_rebalancing_concurrent_count =2; Query OK, 0 rows affected (Elapsed: 00:00:00.01)查看gclusterdb.rebalancing_status表重分布进度
gbase> select index_name,end_time,status,percentage,priority,distribution_id from gclusterdb.rebalancing_status; +------------------------------------+----------------------------+-----------+------------+----------+-----------------+ | index_name | end_time | status | percentage | priority | distribution_id | +------------------------------------+----------------------------+-----------+------------+----------+-----------------+ | tanshuang.tans_test_001 | 2024-02-22 00:14:58.478000 | COMPLETED | 100 | 5 | 2 | | gclusterdb.import_audit_log_errors | 2024-02-22 00:14:57.830000 | COMPLETED | 100 | 5 | 2 | | gclusterdb.audit_log_express | 2024-02-22 00:15:10.757000 | COMPLETED | 100 | 5 | 2 | | tanshuang.tans_test_004 | 2024-02-22 00:15:09.454000 | COMPLETED | 100 | 5 | 2 | | test.test_20240125_tmp1 | NULL | RUNNING | 90 | 5 | 2 | | test.test_20240125_tmp2 | NULL | RUNNING | 10 | 5 | 2 | | test.test | NULL | STARTING | 0 | 5 | 2 | | tanshuang.tans_test_002 | 2024-02-22 00:15:13.104000 | COMPLETED | 100 | 5 | 2 | | tanshuang.tans_test_003 | NULL | STARTING | 0 | 5 | 2 | | test.tan_load_test | NULL | STARTING | 0 | 5 | 2 | | test.test_sm3_encrypt | NULL | STARTING | 0 | 5 | 2 | | test.test_20240125_tmp | NULL | STARTING | 0 | 5 | 2 | | test.test_20240125_tmp3 | NULL | STARTING | 0 | 5 | 2 | +------------------------------------+----------------------------+-----------+------------+----------+-----------------+查看进度
gbase> select count(1) from gclusterdb.rebalancing_status where status <> 'COMPLETED'; +----------+ | count(1) | +----------+ | 8 | +----------+ 1 row in set (Elapsed: 00:00:00.04)还有8张未完成重分布
确认重分布完成：
gbase> select count(1) from gclusterdb.rebalancing_status where status <> 'COMPLETED'; +----------+ | count(1) | +----------+ | 0 | +----------+ 1 row in set (Elapsed: 00:00:00.02)没有再使用data_distribution_id 为1 的表
gbase> select index_name,tbname,data_distribution_id,vc_id from gbase.table_distribution; +------------------------------------+-------------------------+----------------------+---------+ | index_name | tbname | data_distribution_id | vc_id | +------------------------------------+-------------------------+----------------------+---------+ | gclusterdb.nodedatamap | nodedatamap | 1 | vc00001 | | gclusterdb.rebalancing_status | rebalancing_status | 2 | vc00001 | | gclusterdb.dual | dual | 2 | vc00001 | | gclusterdb.audit_log_express | audit_log_express | 2 | vc00001 | | tanshuang.tans_test_002 | tans_test_002 | 2 | vc00001 | | test.tan_load_test | tan_load_test | 2 | vc00001 | | tanshuang.tans_test_003 | tans_test_003 | 2 | vc00001 | | gclusterdb.import_audit_log_errors | import_audit_log_errors | 2 | vc00001 | | tanshuang.tans_test_001 | tans_test_001 | 2 | vc00001 | | tanshuang.tans_test_004 | tans_test_004 | 2 | vc00001 | | test.test_sm3_encrypt | test_sm3_encrypt | 2 | vc00001 | +------------------------------------+-------------------------+----------------------+---------+ 11 rows in set (Elapsed: 00:00:00.00)gclusterdb.nodedatamap这个表先不用管
从分布完成之后删除老的distribution
[gbase@node1 gcinstall]$ gcadmin rmdistribution 1 cluster distribution ID [1] it will be removed now please ensure this is ok, input [Y,y] or [N,n]: y select count(*) from gbase.nodedatamap where data_distribution_id=1 result is not 0 refreshnodedatamap drop 1 success gcadmin remove distribution [1] success [gbase@node1 gcinstall]$ [gbase@node1 gcinstall]$[gbase@node1 gcinstall]$ gcadmin showdistribution Distribution ID: 2 | State: new | Total segment num: 2 Primary Segment Node IP Segment ID Duplicate Segment node IP ======================================================================================================================== | 192.168.110.21 | 1 | 192.168.110.24 | ------------------------------------------------------------------------------------------------------------------------ | 192.168.110.24 | 2 | 192.168.110.21 | ======================================================================================================================== [gbase@node1 gcinstall]$从集群中删除节点信息：
编写新的gcChangeInfo_20240221_rm
[gbase@node1 gcinstall]$ cat gcChangeInfo_20240221_rm.xml
[gbase@node1 gcinstall]$
从集群中删除节点信息 [gbase@node1 gcinstall]$ gcadmin rmnodes gcChangeInfo_20240221_rm.xml gcadmin remove nodes ... gcadmin rmnodes from cluster success [gbase@node1 gcinstall]$ gcadmin CLUSTER STATE: ACTIVE VIRTUAL CLUSTER MODE: NORMAL ================================================================= | GBASE COORDINATOR CLUSTER INFORMATION | ================================================================= | NodeName | IpAddress | gcware | gcluster | DataState | ----------------------------------------------------------------- | coordinator1 | 192.168.110.21 | OPEN | OPEN | 0 | ----------------------------------------------------------------- | coordinator2 | 192.168.110.22 | OPEN | OPEN | 0 | ----------------------------------------------------------------- ========================================================================================================= | GBASE DATA CLUSTER INFORMATION | ========================================================================================================= | NodeName | IpAddress | DistributionId | gnode | syncserver | DataState | --------------------------------------------------------------------------------------------------------- | node1 | 192.168.110.21 | 2 | OPEN | OPEN | 0 | --------------------------------------------------------------------------------------------------------- | node4 | 192.168.110.24 | 2 | OPEN | OPEN | 0 | --------------------------------------------------------------------------------------------------------- [gbase@node1 gcinstall]$这个时候data节点信息移除了，但是管理节点仍然在，需要进行卸载。
卸载节点
编写demo.option
[gbase@node1 gcinstall]$ cat demo.options
installPrefix= /opt
coordinateHost = 192.168.110.22
coordinateHostNodeID = 22
dataHost = 192.168.110.22,192.168.110.23
existCoordinateHost = 192.168.110.21
existDataHost = 192.168.110.21,192.168.110.24
dbaUser = gbase
dbaGroup = gbase
dbaPwd = 'gbase'
rootPwd = 'tansh111111'
#dbRootPwd = ''
#rootPwdFile = rootPwd.json
[gbase@node1 gcinstall]$
停服务：
cexec data: 'gcluster_services all stop'
cexec data: 'gcluster_services all info'
卸载
[gbase@node1 gcinstall]$ ./unInstall.py --silent=demo.options
These GCluster nodes will be uninstalled.
CoordinateHost:
192.168.110.22
DataHost:
192.168.110.22 192.168.110.23
Are you sure to uninstall GCluster ([Y,y]/[N,n])? [Y,y] or [N,n] : y
192.168.110.23 unInstall 192.168.110.23 successfully.
192.168.110.22 unInstall 192.168.110.22 successfully.
Update all coordinator gcware conf.
192.168.110.21 update gcware conf successfully.
启动服务
cexec data: 'gcluster_services all start' [gbase@node1 gcinstall]$ gcadmin CLUSTER STATE: ACTIVE VIRTUAL CLUSTER MODE: NORMAL ================================================================= | GBASE COORDINATOR CLUSTER INFORMATION | ================================================================= | NodeName | IpAddress | gcware | gcluster | DataState | ----------------------------------------------------------------- | coordinator1 | 192.168.110.21 | OPEN | OPEN | 0 | ----------------------------------------------------------------- ========================================================================================================= | GBASE DATA CLUSTER INFORMATION | ========================================================================================================= | NodeName | IpAddress | DistributionId | gnode | syncserver | DataState | --------------------------------------------------------------------------------------------------------- | node1 | 192.168.110.21 | 2 | OPEN | OPEN | 0 | --------------------------------------------------------------------------------------------------------- | node4 | 192.168.110.24 | 2 | OPEN | OPEN | 0 | ---------------------------------------------------------------------------------------------------------管理节点需要卸载，纯data节点从实际考虑。
缩容测试完成。