元数据节点管理

新增

Restful API：

curl -v "http://192.168.2.160:15010/metaNode/add?addr=192.168.2.162:15210"

参数说明

参数	类型	描述
addr	string	元数据节点和master的交互地址

响应示例

{"code":0,"msg":"success","data":14}

命令行查看结果：

./udbto-cli metanode list

[Meta nodes]
ID        ADDRESS                                                              WRITABLE    ACTIVE      MEDIA        ForbidWriteOpOfProtoVer0
5         192.168.2.160:15210(localhost.localdomain:15210)                     Yes         Active      N/A          notForbid   
6         192.168.2.161:15210(udb64:15210)                                     Yes         Active      N/A          notForbid   
7         192.168.2.185:15210                                                  Yes         Active      N/A          notForbid   
13        192.168.2.162:15210                                                  No          Inactive    N/A          notForbid (新节点未安装)

查询

查询返回元数据节点的详细信息，包括地址、总的内存大小、已使用内存大小等等。

curl -v "http://192.168.2.160:15010/metaNode/get?addr=192.168.2.161:15210"  | python -m json.tool

参数说明

参数	类型	描述
addr	string	元数据节点和master的交互地址

响应示例

{
    "ID": 3,
    "Addr": "10.196.59.202:15210",
    "IsActive": true,
    "Zone": "zone1",
    "MaxMemAvailWeight": 66556215048,
    "TotalWeight": 67132641280,
    "UsedWeight": 576426232,
    "Ratio": 0.008586377967698518,
    "SelectCount": 0,
    "Carry": 0.6645600532184904,
    "Threshold": 0.75,
    "ReportTime": "2018-12-05T17:26:28.29309577+08:00",
    "MetaPartitionCount": 1,
    "NodeSetID": 2,
    "PersistenceMetaPartitions": {}
}

下线节点

下线前，查看节点信息：

./udbto-cli metanode list

用命令行下线：

./udbto-cli metanode decommission 192.168.2.162:15210
Decommission meta node successfully

用Restful API下线：

curl -v "http://192.168.2.160:15010/metaNode/decommission?addr=192.168.2.162:15210"

响应示例

{"code":0,"msg":"success","data":"decommissionMetaNode metaNode [192.168.2.162:15210] limit 0 has offline successfully"}

设置阈值

如果某元数据节点内存使用率达到这个阈值，则该节点上所有的元数据分片都会被设置为只读。

命令行：

./udbto-cli cluster threshold 0.8

MetaNode threshold is set to 0.8!

查看结果：

./udbto-cli metanode info 192.168.2.160:15210

[Meta node info]
  ID                  : 5
  Address             : 192.168.2.160:15210(localhost.localdomain:15210)
  Threshold           : 0.8
  MaxMemAvailWeight   : 3.25 GB
  Allocated           : 184.86 MB
  Total               : 3.43 GB
  Zone                : default
  Status              : Active
  Rdonly              : false
  Report time         : 2025-09-10 15:31:44
  Partition count     : 15
  Persist partitions  : [13 14 15 1 2 3 4 5 6 7 8 9 12 10 11]
  Can alloc partition : true
  Max partition count : 300
  CpuUtil             : 3.1%

Restful API:

curl -v "http://192.168.2.160:15010/threshold/set?threshold=0.75"

参数说明

参数	类型	描述
threshold	float64	元数据节点能使用本机内存的最大比率

响应示例

{"code":0,"msg":"success","data":"set threshold to 0.75 successfully"}

迁移

从源元数据节点迁移指定个数元数据分区至目标元数据节点。

curl -v "http://192.168.2.160:15010/metaNode/migrate?srcAddr=192.168.2.160:15210&targetAddr=192.168.2.161:15210&count=3"

参数列表

响应示例

{"code":0,"msg":"success","data":"migrateMetaNodeHandler from src [192.168.0.143:15210] to targaet[192.168.0.183:15210] has migrate successfully"}