// Open creates options and opens the database. If the database
// doesn't yet exist at the specified directory, one is initialized
// from scratch. The RocksDB Open and Close methods are reference
// counted such that subsequent Open calls to an already opened
// RocksDB instance only bump the reference count. The RocksDB is only
// closed when a sufficient number of Close calls are performed to
// bring the reference count down to 0.
func (r *RocksDB) Open() error {
if r.rdb != nil {
return nil
}
if r.memtableBudget < minMemtableBudget {
return util.Errorf("memtable budget must be at least %s: %s",
humanize.IBytes(minMemtableBudget), humanizeutil.IBytes(r.memtableBudget))
}
var ver storageVersion
if len(r.dir) != 0 {
log.Infof("opening rocksdb instance at %q", r.dir)
// Check the version number.
var err error
if ver, err = getVersion(r.dir); err != nil {
return err
}
if ver < versionMinimum || ver > versionCurrent {
// Instead of an error, we should call a migration if possible when
// one is needed immediately following the DBOpen call.
return fmt.Errorf("incompatible rocksdb data version, current:%d, on disk:%d, minimum:%d",
versionCurrent, ver, versionMinimum)
}
} else {
log.Infof("opening in memory rocksdb instance")
// In memory dbs are always current.
ver = versionCurrent
}
status := C.DBOpen(&r.rdb, goToCSlice([]byte(r.dir)),
C.DBOptions{
cache_size: C.uint64_t(r.cacheSize),
memtable_budget: C.uint64_t(r.memtableBudget),
block_size: C.uint64_t(envutil.EnvOrDefaultBytes("rocksdb_block_size", defaultBlockSize)),
wal_ttl_seconds: C.uint64_t(envutil.EnvOrDefaultDuration("rocksdb_wal_ttl", 0).Seconds()),
allow_os_buffer: C.bool(true),
logging_enabled: C.bool(log.V(3)),
})
if err := statusToError(status); err != nil {
return util.Errorf("could not open rocksdb instance: %s", err)
}
// Update or add the version file if needed.
if ver < versionCurrent {
if err := writeVersionFile(r.dir); err != nil {
return err
}
}
// Start a goroutine that will finish when the underlying handle
// is deallocated. This is used to check a leak in tests.
go func() {
<-r.deallocated
}()
r.stopper.AddCloser(r)
return nil
}
// newBookie creates a reservations system and starts its timeout queue.
func newBookie(
clock *hlc.Clock,
stopper *stop.Stopper,
metrics *storeMetrics,
reservationTimeout time.Duration,
) *bookie {
b := &bookie{
clock: clock,
metrics: metrics,
reservationTimeout: reservationTimeout,
maxReservations: envutil.EnvOrDefaultInt("max_reservations", defaultMaxReservations),
maxReservedBytes: envutil.EnvOrDefaultBytes("max_reserved_bytes", defaultMaxReservedBytes),
}
b.mu.reservationsByRangeID = make(map[roachpb.RangeID]*reservation)
b.start(stopper)
return b
}