codemode

type CodeMode uint8

type CodeModeName string

type Policy struct {
	ModeName CodeModeName `json:"mode_name"`
	// min size of object, access use this to put object
	MinSize int64 `json:"min_size"`
	// max size of object. access use this to put object
	MaxSize int64 `json:"max_size"`
	// code mode's cluster space size ratio, clusterMgr should use this to create specified num of volume
	SizeRatio float64 `json:"size_ratio"`
	// enable means this kind of code mode enable or not
	// access/allocator will ignore this kind of code mode's allocation when enable is false
	// clustermgr will ignore this kind of code mode's creation when enable is false
	Enable bool `json:"enable"`
}

type Tactic struct {
	N int
	M int
	// local parity count
	L int
	// the count of AZ, access use this for split data shards and parity shards
	AZCount int

	// PutQuorum write quorum,
	// MUST make sure that ec data is recoverable if one AZ was down
	// We SHOULD ignore the local shards
	// (N + M) / AZCount + N <= PutQuorum <= M + N
	PutQuorum int

	// get quorum config
	GetQuorum int

	// MinShardSize min size per shard, fill data into shards 0-N continuously,
	// align with zero bytes if data size less than MinShardSize*N
	//
	// length of data less than MinShardSize*N, size of per shard = MinShardSize
	//  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	//  |  data  |                 align zero bytes                     |
	//  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	//  |    0    |    1    |    2    |   ....                |    N    |
	//  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	//
	// length of data more than MinShardSize*N, size of per shard = ceil(len(data)/N)
	//  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	//  |                           data                        |padding|
	//  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	//  |    0    |    1    |    2    |   ....                |    N    |
	//  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	MinShardSize int
}