Commit 5247f617 authored by Kirill Smelkov's avatar Kirill Smelkov

.

parent ddadb8b1
......@@ -43,7 +43,7 @@ import (
//
// rule. The `oid % Np` is known as partition identifier of oid.
//
// There is also externally set "redundancy factor" R which describes the minimum
// There is also externally set "replication factor" R which describes the minimum
// amount of separate nodes a particular object data should be stored into at the same time.
//
// Given Np, R and []Storage PartitionTable tries to organize
......@@ -52,11 +52,12 @@ import (
//
// mapping so that
//
// - redundancy level set by R is met
// - replication level set by R is met
// - storages associated with adjacent pids are different
//
// when such organization is reached the partition table is called operational
// and non-operational otherwise. XXX and if storages are ready
// when such organization is reached, and enough storage nodes are in "running"
// state, the partition table is called operational and non-operational
// otherwise.
//
// The PartitionTable can auto-adjust to storage nodes coming and going.
// Let's consider cluster change from Ns1 to Ns2 storage nodes: if we pick
......@@ -115,14 +116,11 @@ import (
//
// PartitionTable zero value is valid empty partition table.
type PartitionTable struct {
// XXX do we need sync.Mutex here for updates ?
PTid proto.PTid // ↑ for versioning
tab [][]Cell // [#Np] pid -> []Cell
PTid proto.PTid // ↑ for versioning XXX -> ver ? XXX move out of here?
}
// Cell describes one storage in a pid entry in partition table
// Cell describes one storage in a pid entry in partition table.
type Cell struct {
proto.CellInfo // .nid + .state
......@@ -181,8 +179,6 @@ func MakePartTab(np int, nodev []*PeerNode) *PartitionTable {
// - whether there are corresponding storage nodes that are up
//
// information about nodes being up or down is obtained from supplied NodeTable
//
// XXX or keep not only NodeID in Cell - add *Node ?
func (pt *PartitionTable) OperationalWith(nt *NodeTable) bool {
// empty partition table is never operational
if len(pt.tab) == 0 {
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment