// Capacity queries the underlying file system for disk capacity information.
func (r *RocksDB) Capacity() (roachpb.StoreCapacity, error) {
fileSystemUsage := gosigar.FileSystemUsage{}
dir := r.dir
if dir == "" {
dir = "/tmp"
}
if err := fileSystemUsage.Get(dir); err != nil {
return roachpb.StoreCapacity{}, err
}
if fileSystemUsage.Total > math.MaxInt64 {
return roachpb.StoreCapacity{}, fmt.Errorf("unsupported disk size %s, max supported size is %s",
humanize.IBytes(fileSystemUsage.Total), util.IBytes(math.MaxInt64))
}
if fileSystemUsage.Avail > math.MaxInt64 {
return roachpb.StoreCapacity{}, fmt.Errorf("unsupported disk size %s, max supported size is %s",
humanize.IBytes(fileSystemUsage.Avail), util.IBytes(math.MaxInt64))
}
fsuTotal := int64(fileSystemUsage.Total)
fsuAvail := int64(fileSystemUsage.Avail)
// If no size limitation have been placed on the store size or if the
// limitation is greater than what's available, just return the actual
// totals.
if r.maxSize == 0 || r.maxSize >= fsuTotal || r.dir == "" {
return roachpb.StoreCapacity{
Capacity: fsuTotal,
Available: fsuAvail,
}, nil
}
// Find the total size of all the files in the r.dir and all its
// subdirectories.
var totalUsedBytes int64
if errOuter := filepath.Walk(r.dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return nil
}
if info.Mode().IsRegular() {
totalUsedBytes += info.Size()
}
return nil
}); errOuter != nil {
return roachpb.StoreCapacity{}, errOuter
}
available := r.maxSize - totalUsedBytes
if available > fsuAvail {
available = fsuAvail
}
if available < 0 {
available = 0
}
return roachpb.StoreCapacity{
Capacity: r.maxSize,
Available: available,
}, nil
}
// 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), util.IBytes(r.memtableBudget))
}
if len(r.dir) != 0 {
log.Infof("opening rocksdb instance at %q", r.dir)
}
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),
allow_os_buffer: C.bool(true),
logging_enabled: C.bool(log.V(3)),
})
err := statusToError(status)
if err != nil {
return util.Errorf("could not open rocksdb instance: %s", 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
}
// String returns a fully parsable version of the store spec.
func (ss StoreSpec) String() string {
var buffer bytes.Buffer
if len(ss.Path) != 0 {
fmt.Fprintf(&buffer, "path=%s,", ss.Path)
}
if ss.InMemory {
fmt.Fprint(&buffer, "type=mem,")
}
if ss.SizeInBytes > 0 {
fmt.Fprintf(&buffer, "size=%s,", util.IBytes(ss.SizeInBytes))
}
if ss.SizePercent > 0 {
fmt.Fprintf(&buffer, "size=%s%%,", humanize.Ftoa(ss.SizePercent))
}
if len(ss.Attributes.Attrs) > 0 {
fmt.Fprint(&buffer, "attrs=")
for i, attr := range ss.Attributes.Attrs {
if i != 0 {
fmt.Fprint(&buffer, ":")
}
fmt.Fprintf(&buffer, attr)
}
fmt.Fprintf(&buffer, ",")
}
// Trim the extra comma from the end if it exists.
if l := buffer.Len(); l > 0 {
buffer.Truncate(l - 1)
}
return buffer.String()
}
// InitStores initializes ctx.Engines based on ctx.Stores.
func (ctx *Context) InitStores(stopper *stop.Stopper) error {
// TODO(peter): The comments and docs say that CacheSize and MemtableBudget
// are split evenly if there are multiple stores, but we aren't doing that
// currently. See #4979 and #4980.
for _, spec := range ctx.Stores.Specs {
var sizeInBytes = spec.SizeInBytes
if spec.InMemory {
if spec.SizePercent > 0 {
sysMem, err := GetTotalMemory()
if err != nil {
return fmt.Errorf("could not retrieve system memory")
}
sizeInBytes = int64(float64(sysMem) * spec.SizePercent / 100)
}
if sizeInBytes != 0 && sizeInBytes < minimumStoreSize {
return fmt.Errorf("%f%% of memory is only %s bytes, which is below the minimum requirement of %s",
spec.SizePercent, util.IBytes(sizeInBytes), util.IBytes(minimumStoreSize))
}
ctx.Engines = append(ctx.Engines, engine.NewInMem(spec.Attributes, sizeInBytes, stopper))
} else {
if spec.SizePercent > 0 {
fileSystemUsage := gosigar.FileSystemUsage{}
if err := fileSystemUsage.Get(spec.Path); err != nil {
return err
}
sizeInBytes = int64(float64(fileSystemUsage.Total) * spec.SizePercent / 100)
}
if sizeInBytes != 0 && sizeInBytes < minimumStoreSize {
return fmt.Errorf("%f%% of %s's total free space is only %s bytes, which is below the minimum requirement of %s",
spec.SizePercent, spec.Path, util.IBytes(sizeInBytes), util.IBytes(minimumStoreSize))
}
ctx.Engines = append(ctx.Engines, engine.NewRocksDB(spec.Attributes, spec.Path,
ctx.CacheSize/int64(len(ctx.Stores.Specs)), ctx.MemtableBudget, sizeInBytes, stopper))
}
}
if len(ctx.Engines) == 1 {
log.Infof("1 storage engine initialized")
} else {
log.Infof("%d storage engines initialized", len(ctx.Engines))
}
return nil
}
// GetTotalMemory returns either the total system memory or if possible the
// cgroups available memory.
func GetTotalMemory() (int64, error) {
mem := gosigar.Mem{}
if err := mem.Get(); err != nil {
return 0, err
}
if mem.Total > math.MaxInt64 {
return 0, fmt.Errorf("inferred memory size %s exceeds maximum supported memory size %s",
humanize.IBytes(mem.Total), humanize.Bytes(math.MaxInt64))
}
totalMem := int64(mem.Total)
if runtime.GOOS == "linux" {
var err error
var buf []byte
if buf, err = ioutil.ReadFile(defaultCGroupMemPath); err != nil {
if log.V(1) {
log.Infof("can't read available memory from cgroups (%s), using system memory %s instead", err,
util.IBytes(totalMem))
}
return totalMem, nil
}
var cgAvlMem uint64
if cgAvlMem, err = strconv.ParseUint(strings.TrimSpace(string(buf)), 10, 64); err != nil {
if log.V(1) {
log.Infof("can't parse available memory from cgroups (%s), using system memory %s instead", err,
util.IBytes(totalMem))
}
return totalMem, nil
}
if cgAvlMem > math.MaxInt64 {
if log.V(1) {
log.Infof("available memory from cgroups is too large and unsupported %s using system memory %s instead",
humanize.IBytes(cgAvlMem), util.IBytes(totalMem))
}
return totalMem, nil
}
return int64(cgAvlMem), nil
}
return totalMem, nil
}
func (b *bytesValue) String() string {
// This uses the MiB, GiB, etc suffixes. If we use humanize.Bytes() we get
// the MB, GB, etc suffixes, but the conversion is done in multiples of 1000
// vs 1024.
return util.IBytes(*b.val)
}
// newStoreSpec parses the string passed into a --store flag and returns a
// StoreSpec if it is correctly parsed.
// There are four possible fields that can be passed in, comma separated:
// - path=xxx The directory in which to the rocks db instance should be
// located, required unless using a in memory storage.
// - type=mem This specifies that the store is an in memory storage instead of
// an on disk one. mem is currently the only other type available.
// - size=xxx The optional maximum size of the storage. This can be in one of a
// few different formats.
// - 10000000000 -> 10000000000 bytes
// - 20GB -> 20000000000 bytes
// - 20GiB -> 21474836480 bytes
// - 0.02TiB -> 21474836480 bytes
// - 20% -> 20% of the available space
// - 0.2 -> 20% of the available space
// - attrs=xxx:yyy:zzz A colon separated list of optional attributes.
// Note that commas are forbidden within any field name or value.
func newStoreSpec(value string) (StoreSpec, error) {
if len(value) == 0 {
return StoreSpec{}, fmt.Errorf("no value specified")
}
var ss StoreSpec
used := make(map[string]struct{})
for _, split := range strings.Split(value, ",") {
if len(split) == 0 {
continue
}
subSplits := strings.SplitN(split, "=", 2)
var field string
var value string
if len(subSplits) == 1 {
field = "path"
value = subSplits[0]
} else {
field = strings.ToLower(subSplits[0])
value = subSplits[1]
}
if _, ok := used[field]; ok {
return StoreSpec{}, fmt.Errorf("%s field was used twice in store definition", field)
}
used[field] = struct{}{}
if len(field) == 0 {
continue
}
if len(value) == 0 {
return StoreSpec{}, fmt.Errorf("no value specified for %s", field)
}
switch field {
case "path":
if len(value) == 0 {
}
ss.Path = value
case "size":
if len(value) == 0 {
return StoreSpec{}, fmt.Errorf("no size specified")
}
if unicode.IsDigit(rune(value[len(value)-1])) &&
(strings.HasPrefix(value, "0.") || strings.HasPrefix(value, ".")) {
// Value is a percentage without % sign.
var err error
ss.SizePercent, err = strconv.ParseFloat(value, 64)
ss.SizePercent *= 100
if err != nil {
return StoreSpec{}, fmt.Errorf("could not parse store size (%s) %s", value, err)
}
if ss.SizePercent > 100 || ss.SizePercent < 1 {
return StoreSpec{}, fmt.Errorf("store size (%s) must be between 1%% and 100%%", value)
}
} else if strings.HasSuffix(value, "%") {
// Value is a percentage.
var err error
ss.SizePercent, err = strconv.ParseFloat(value[:len(value)-1], 64)
if err != nil {
return StoreSpec{}, fmt.Errorf("could not parse store size (%s) %s", value, err)
}
if ss.SizePercent > 100 || ss.SizePercent < 1 {
return StoreSpec{}, fmt.Errorf("store size (%s) must be between 1%% and 100%%", value)
}
} else {
var err error
ss.SizeInBytes, err = util.ParseBytes(value)
if err != nil {
return StoreSpec{}, fmt.Errorf("could not parse store size (%s) %s", value, err)
}
if ss.SizeInBytes < minimumStoreSize {
return StoreSpec{}, fmt.Errorf("store size (%s) must be larger than %s", value,
util.IBytes(minimumStoreSize))
}
}
case "attrs":
if len(value) == 0 {
return StoreSpec{}, fmt.Errorf("no attributes specified")
}
// Check to make sure there are no duplicate attributes.
attrMap := make(map[string]struct{})
for _, attribute := range strings.Split(value, ":") {
if _, ok := attrMap[attribute]; ok {
return StoreSpec{}, fmt.Errorf("duplicate attribute given for store: %s", attribute)
}
attrMap[attribute] = struct{}{}
}
for attribute := range attrMap {
ss.Attributes.Attrs = append(ss.Attributes.Attrs, attribute)
}
sort.Strings(ss.Attributes.Attrs)
case "type":
if value == "mem" {
ss.InMemory = true
} else {
return StoreSpec{}, fmt.Errorf("%s is not a valid store type", value)
}
default:
return StoreSpec{}, fmt.Errorf("%s is not a valid store field", field)
}
}
if ss.InMemory {
// Only in memory stores don't need a path and require a size.
if ss.Path != "" {
return StoreSpec{}, fmt.Errorf("path specified for in memory store")
}
if ss.SizePercent == 0 && ss.SizeInBytes == 0 {
return StoreSpec{}, fmt.Errorf("size must be specified for an in memory store")
}
} else if ss.Path == "" {
return StoreSpec{}, fmt.Errorf("no path specified")
}
return ss, nil
}
