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logdb.go
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logdb.go
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package logdb
import (
"github.com/LiuzhouChan/go-paxos/logger"
"github.com/LiuzhouChan/go-paxos/paxosio"
)
var (
plog = logger.GetLogger("logdb")
)
func checkDirs(dirs []string, lldirs []string) {
if len(dirs) == 1 {
if len(lldirs) != 0 && len(lldirs) != 1 {
plog.Panicf("only 1 regular dir but %d low latency dirs", len(lldirs))
}
} else if len(dirs) > 1 {
if uint64(len(dirs)) != numOfRocksDBInstance {
plog.Panicf("%d regular dirs, but expect to have %d rdb instances",
len(dirs), numOfRocksDBInstance)
}
if len(lldirs) > 0 {
if len(dirs) != len(lldirs) {
plog.Panicf("%v regular dirs, but %v low latency dirs", dirs, lldirs)
}
}
} else {
panic("no regular dir")
}
}
// OpenLogDB opens a LogDB instance using the default implementation.
func OpenLogDB(dirs []string, lowLatencyDirs []string) (paxosio.ILogDB, error) {
checkDirs(dirs, lowLatencyDirs)
llDirRequired := len(lowLatencyDirs) == 1
if len(dirs) == 1 {
for i := uint64(1); i < numOfRocksDBInstance; i++ {
dirs = append(dirs, dirs[0])
if llDirRequired {
lowLatencyDirs = append(lowLatencyDirs, lowLatencyDirs[0])
}
}
}
return OpenShardedRDB(dirs, lowLatencyDirs)
}