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state: Document index table

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And move the IndexEntry (which is stored in the table) next to the table
schema definition.
This commit is contained in:
Daniel Nephin 2021-02-05 17:45:27 -05:00
parent ddf292caf6
commit 3ecbeda234
2 changed files with 13 additions and 8 deletions
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15
agent/consul/state/schema.go
View File

@ -52,8 +52,19 @@ func addTableSchemas(db *memdb.DBSchema, schemas ...func() *memdb.TableSchema) {
}
}
// indexTableSchema returns a new table schema used for tracking various indexes
// for the Raft log.
// IndexEntry keeps a record of the last index of a table or entity within a table.
type IndexEntry struct {
Key string
Value uint64
}
// indexTableSchema returns a new table schema used for tracking various the
// latest raft index for a table or entities within a table.
//
// The index table is necessary for tables that do not use tombstones. If the latest
// items in the table are deleted, the max index of a table would appear to go
// backwards. With the index table we can keep track of the latest update to a
// table, even when that update is a delete of the most recent item.
func indexTableSchema() *memdb.TableSchema {
return &memdb.TableSchema{
Name: "index",

6
agent/consul/state/state_store.go
View File

@ -134,12 +134,6 @@ type Restore struct {
tx *txn
}
// IndexEntry keeps a record of the last index per-table.
type IndexEntry struct {
Key string
Value uint64
}
// sessionCheck is used to create a many-to-one table such that
// each check registered by a session can be mapped back to the
// session table. This is only used internally in the state