TiFlash在线扩缩容

Tiflash扩缩容方式和TiDB/TiKV/PD不一样;

首先确认版本,TiFlash在线扩容,必须是V4.0以上版本;

如果是v4.0需要开启PD参数 enable-placement-rules ; 如果是v5.0,该菜蔬默认开启;

一、 编辑配置文件

tiflash_servers:
- host: x.x.x.x
  ssh_port: 22
  tcp_port: 9000
  http_port: 8123
  flash_service_port: 3930
  flash_proxy_port: 20170
  flash_proxy_status_port: 20292
  metrics_port: 8234
  deploy_dir: /export/servers/TiDB/soft/tiflash-9000
  data_dir: /export/servers/TiDB/data/tiflash-9000
  log_dir: /export/servers/TiDB/soft/tiflash-9000/log

二,开始扩容:

tiup cluster scale-out cluster-default scale-out-tiflash.yaml 

扩容完毕提示: Scaled cluster `cluster-default` out successfully

三、 tiup cluster display cluster-default 验证

在线缩容

一, 需要保证tiflash缩容后的剩余节点数大于表的最大副本数,否则就需要调整副本数;调整命令如下:         alter table {dbname}.{tbname} set tiflash replica 0

查看Tiflash表副本数方式:

mysql> select * from information_schema.tiflash_replica;
+--------------+------------+----------+---------------+-----------------+-----------+----------+
| TABLE_SCHEMA | TABLE_NAME | TABLE_ID | REPLICA_COUNT | LOCATION_LABELS | AVAILABLE | PROGRESS |
+--------------+------------+----------+---------------+-----------------+-----------+----------+
| test         | hero       |       57 |             2 |                 |         1 |        1 |
| test         | t1         |       59 |             2 |                 |         1 |        1 |
| test         | t2         |       63 |             2 |                 |         1 |        1 |
+--------------+------------+----------+---------------+-----------------+-----------+----------+
3 rows in set (0.00 sec)

二、 查看要缩容的节点信息

tiup cluster display cluster-default

三、 执行缩容

tiup cluster scale-in cluster-default x.x.x.x:9000

成功后提示: Scaled cluster `cluster-default` in successfully

四,销毁节点

缩容后节点状态变为Tombstone,如下:

#  tiup cluster display cluster-default
Starting component `cluster`: /root/.tiup/components/cluster/v1.7.0/tiup-cluster display cluster-default
Cluster type:       tidb
Cluster name:       cluster-default
Cluster version:    v5.3.0
Deploy user:        tidb
SSH type:           builtin
Dashboard URL:      http://x.x.x.x:2379/dashboard
ID                   Role          Host            Ports                            OS/Arch       Status     Data Dir                                     Deploy Dir
--                   ----          ----            -----                            -------       ------     --------                                     ----------
x.x.x.x:9093   alertmanager  x.x.x.x   9093/9094                        linux/x86_64  Up         /export/servers/TiDB/data/alertmanager-9093  /export/servers/TiDB/soft/alertmanager-9093
x.x.x.x:3000   grafana       x.x.x.x   3000                             linux/x86_64  Up         -                                            /export/servers/TiDB/soft/grafana-3000
x.x.x.x:2379   pd            x.x.x.x   2379/2380                        linux/x86_64  Up|UI      /export/servers/TiDB/data/pd-2379            /export/servers/TiDB/soft/pd-2379
x.x.x.x:2379   pd            x.x.x.x   2379/2380                        linux/x86_64  Up         /export/servers/TiDB/data/pd-2379            /export/servers/TiDB/soft/pd-2379
x.x.x.x:2379   pd            x.x.x.x   2379/2380                        linux/x86_64  Up|L       /export/servers/TiDB/data/pd-2379            /export/servers/TiDB/soft/pd-2379
x.x.x.x:9090   prometheus    x.x.x.x   9090                             linux/x86_64  Up         /export/servers/TiDB/data/prometheus-9090    /export/servers/TiDB/soft/prometheus-9090
x.x.x.x:4000     tidb          x.x.x.x     4000/10080                       linux/x86_64  Up         -                                            /export/servers/TiDB/soft/tidb-4000
x.x.x.x:9000     tiflash       x.x.x.x     9000/8123/3930/20170/20292/8234  linux/x86_64  Tombstone  /export/servers/TiDB/data/tiflash-9000       /export/servers/TiDB/soft/tiflash-9000
x.x.x.x:9000  tiflash       x.x.x.x  9000/8123/3930/20170/20292/8234  linux/x86_64  Up         /export/servers/TiDB/data/tiflash-9000       /export/servers/TiDB/soft/tiflash-9000
x.x.x.x:20160    tikv          x.x.x.x     20160/20180                      linux/x86_64  Up         /export/servers/TiDB/data/tikv-20160         /export/servers/TiDB/soft/tikv-20160
x.x.x.x:20160    tikv          x.x.x.x     20160/20180                      linux/x86_64  Up         /export/servers/TiDB/data/tikv-20160         /export/servers/TiDB/soft/tikv-20160
x.x.x.x:20160  tikv          x.x.x.x   20160/20180                      linux/x86_64  Up         /export/servers/TiDB/data/tikv-20160         /export/servers/TiDB/soft/tikv-20160
Total nodes: 12
There are some nodes can be pruned: 
        Nodes: [x.x.x.x:3930]
        You can destroy them with the command: `tiup cluster prune cluster-default`

tiup cluster prune {cluster-name}  --force进行销毁

成功销毁后提示: Destroy success

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