seaweedfs/weed/filer/mysql_store
vancepym ee6067e98c Fix: the maximum-length character exceed 255
The length of a CHAR column is fixed to the length that you declare when you create the table. The length can be any value from 0 to 255. When CHAR values are stored, they are right-padded with spaces to the specified length. 

see https://dev.mysql.com/doc/refman/5.7/en/char.html
2017-01-23 20:33:00 +08:00
..
mysql_store.go Fix: the maximum-length character exceed 255 2017-01-23 20:33:00 +08:00
mysql_store_test.go refactoring mysql store code 2016-09-05 14:10:22 +08:00
README.md filer mysqlstore bug fix 2016-09-08 11:35:54 +08:00

#MySQL filer mapping store

Schema format

Basically, uriPath and fid are the key elements stored in MySQL. In view of the optimization and user's usage, adding primary key with integer type and involving createTime, updateTime, status fields should be somewhat meaningful. Of course, you could customize the schema per your concretely circumstance freely.


CREATE TABLE IF NOT EXISTS `filer_mapping` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `uriPath` char(256) NOT NULL DEFAULT "" COMMENT 'http uriPath',
  `fid` char(36) NOT NULL DEFAULT "" COMMENT 'seaweedfs fid',
  `createTime` int(10) NOT NULL DEFAULT 0 COMMENT 'createdTime in unix timestamp',
  `updateTime` int(10) NOT NULL DEFAULT 0 COMMENT 'updatedTime in unix timestamp',
  `remark` varchar(20) NOT NULL DEFAULT "" COMMENT 'reserverd field',
  `status` tinyint(2) DEFAULT '1' COMMENT 'resource status',
  PRIMARY KEY (`id`),
  UNIQUE KEY `index_uriPath` (`uriPath`)
) DEFAULT CHARSET=utf8;

The MySQL 's config params is not added into the weed command option as other stores(redis,cassandra). Instead, We created a config file(json format) for them. TOML,YAML or XML also should be OK. But TOML and YAML need import thirdparty package while XML is a little bit complex.

The sample config file's content is below:


{
    "mysql": [
        {
            "User": "root",
            "Password": "root",
            "HostName": "127.0.0.1",
            "Port": 3306,
            "DataBase": "seaweedfs"
        },
        {
            "User": "root",
            "Password": "root",
            "HostName": "127.0.0.2",
            "Port": 3306,
            "DataBase": "seaweedfs"
        }
    ],
    "IsSharding":true,
    "ShardCount":1024
}

The "mysql" field in above conf file is an array which include all mysql instances you prepared to store sharding data.

  1. If one mysql instance is enough, just keep one instance in "mysql" field.

  2. If table sharding at a specific mysql instance is needed , mark "IsSharding" field with true and specify total table sharding numbers using "ShardCount" field.

  3. If the mysql service could be auto scaled transparently in your environment, just config one mysql instance(usually it's a frondend proxy or VIP),and mark "IsSharding" with false value

  4. If you prepare more than one mysql instance and have no plan to use table sharding for any instance(mark isSharding with false), instance sharding will still be done implicitly