Line data Source code
1 : // Copyright 2018 The LevelDB-Go and Pebble Authors. All rights reserved. Use
2 : // of this source code is governed by a BSD-style license that can be found in
3 : // the LICENSE file.
4 :
5 : package sstable
6 :
7 : import (
8 : "bytes"
9 : "encoding/binary"
10 : "fmt"
11 : "math"
12 : "reflect"
13 : "sort"
14 : "unsafe"
15 :
16 : "github.com/cockroachdb/pebble/internal/intern"
17 : )
18 :
19 : const propertiesBlockRestartInterval = math.MaxInt32
20 : const propGlobalSeqnumName = "rocksdb.external_sst_file.global_seqno"
21 :
22 : var propTagMap = make(map[string]reflect.StructField)
23 : var propBoolTrue = []byte{'1'}
24 : var propBoolFalse = []byte{'0'}
25 :
26 : var propOffsetTagMap = make(map[uintptr]string)
27 :
28 1 : func generateTagMaps(t reflect.Type, indexPrefix []int) {
29 1 : for i := 0; i < t.NumField(); i++ {
30 1 : f := t.Field(i)
31 1 : if f.Type.Kind() == reflect.Struct {
32 1 : if tag := f.Tag.Get("prop"); i == 0 && tag == "pebble.embbeded_common_properties" {
33 1 : // CommonProperties struct embedded in Properties. Note that since
34 1 : // CommonProperties is placed at the top of properties we can use
35 1 : // the offsets of the fields within CommonProperties to determine
36 1 : // the offsets of those fields within Properties.
37 1 : generateTagMaps(f.Type, []int{i})
38 1 : continue
39 : }
40 0 : panic("pebble: unknown struct type in Properties")
41 : }
42 1 : if tag := f.Tag.Get("prop"); tag != "" {
43 1 : switch f.Type.Kind() {
44 1 : case reflect.Bool:
45 1 : case reflect.Uint32:
46 1 : case reflect.Uint64:
47 1 : case reflect.String:
48 0 : default:
49 0 : panic(fmt.Sprintf("unsupported property field type: %s %s", f.Name, f.Type))
50 : }
51 1 : if len(indexPrefix) > 0 {
52 1 : // Prepend the index prefix so that we can use FieldByIndex on the top-level struct.
53 1 : f.Index = append(indexPrefix[:len(indexPrefix):len(indexPrefix)], f.Index...)
54 1 : }
55 1 : propTagMap[tag] = f
56 1 : propOffsetTagMap[f.Offset] = tag
57 : }
58 : }
59 : }
60 :
61 1 : func init() {
62 1 : generateTagMaps(reflect.TypeOf(Properties{}), nil)
63 1 : }
64 :
65 : // CommonProperties holds properties for either a virtual or a physical sstable. This
66 : // can be used by code which doesn't care to make the distinction between physical
67 : // and virtual sstables properties.
68 : //
69 : // For virtual sstables, fields are constructed through extrapolation upon virtual
70 : // reader construction. See MakeVirtualReader for implementation details.
71 : //
72 : // NB: The values of these properties can affect correctness. For example,
73 : // if NumRangeKeySets == 0, but the sstable actually contains range keys, then
74 : // the iterators will behave incorrectly.
75 : type CommonProperties struct {
76 : // The number of entries in this table.
77 : NumEntries uint64 `prop:"rocksdb.num.entries"`
78 : // Total raw key size.
79 : RawKeySize uint64 `prop:"rocksdb.raw.key.size"`
80 : // Total raw value size.
81 : RawValueSize uint64 `prop:"rocksdb.raw.value.size"`
82 : // Total raw key size of point deletion tombstones. This value is comparable
83 : // to RawKeySize.
84 : RawPointTombstoneKeySize uint64 `prop:"pebble.raw.point-tombstone.key.size"`
85 : // Sum of the raw value sizes carried by point deletion tombstones
86 : // containing size estimates. See the DeleteSized key kind. This value is
87 : // comparable to Raw{Key,Value}Size.
88 : RawPointTombstoneValueSize uint64 `prop:"pebble.raw.point-tombstone.value.size"`
89 : // The number of point deletion entries ("tombstones") in this table that
90 : // carry a size hint indicating the size of the value the tombstone deletes.
91 : NumSizedDeletions uint64 `prop:"pebble.num.deletions.sized"`
92 : // The number of deletion entries in this table, including both point and
93 : // range deletions.
94 : NumDeletions uint64 `prop:"rocksdb.deleted.keys"`
95 : // The number of range deletions in this table.
96 : NumRangeDeletions uint64 `prop:"rocksdb.num.range-deletions"`
97 : // The number of RANGEKEYDELs in this table.
98 : NumRangeKeyDels uint64 `prop:"pebble.num.range-key-dels"`
99 : // The number of RANGEKEYSETs in this table.
100 : NumRangeKeySets uint64 `prop:"pebble.num.range-key-sets"`
101 : // Total size of value blocks and value index block. Only serialized if > 0.
102 : ValueBlocksSize uint64 `prop:"pebble.value-blocks.size"`
103 : }
104 :
105 : // String is only used for testing purposes.
106 1 : func (c *CommonProperties) String() string {
107 1 : var buf bytes.Buffer
108 1 : v := reflect.ValueOf(*c)
109 1 : loaded := make(map[uintptr]struct{})
110 1 : writeProperties(loaded, v, &buf)
111 1 : return buf.String()
112 1 : }
113 :
114 : // NumPointDeletions is the number of point deletions in the sstable. For virtual
115 : // sstables, this is an estimate.
116 1 : func (c *CommonProperties) NumPointDeletions() uint64 {
117 1 : return c.NumDeletions - c.NumRangeDeletions
118 1 : }
119 :
120 : // Properties holds the sstable property values. The properties are
121 : // automatically populated during sstable creation and load from the properties
122 : // meta block when an sstable is opened.
123 : type Properties struct {
124 : // CommonProperties needs to be at the top of the Properties struct so that the
125 : // offsets of the fields in CommonProperties match the offsets of the embedded
126 : // fields of CommonProperties in Properties.
127 : CommonProperties `prop:"pebble.embbeded_common_properties"`
128 :
129 : // The name of the comparer used in this table.
130 : ComparerName string `prop:"rocksdb.comparator"`
131 : // The compression algorithm used to compress blocks.
132 : CompressionName string `prop:"rocksdb.compression"`
133 : // The compression options used to compress blocks.
134 : CompressionOptions string `prop:"rocksdb.compression_options"`
135 : // The total size of all data blocks.
136 : DataSize uint64 `prop:"rocksdb.data.size"`
137 : // The external sstable version format. Version 2 is the one RocksDB has been
138 : // using since 5.13. RocksDB only uses the global sequence number for an
139 : // sstable if this property has been set.
140 : ExternalFormatVersion uint32 `prop:"rocksdb.external_sst_file.version"`
141 : // The name of the filter policy used in this table. Empty if no filter
142 : // policy is used.
143 : FilterPolicyName string `prop:"rocksdb.filter.policy"`
144 : // The size of filter block.
145 : FilterSize uint64 `prop:"rocksdb.filter.size"`
146 : // The global sequence number to use for all entries in the table. Present if
147 : // the table was created externally and ingested whole.
148 : GlobalSeqNum uint64 `prop:"rocksdb.external_sst_file.global_seqno"`
149 : // Total number of index partitions if kTwoLevelIndexSearch is used.
150 : IndexPartitions uint64 `prop:"rocksdb.index.partitions"`
151 : // The size of index block.
152 : IndexSize uint64 `prop:"rocksdb.index.size"`
153 : // The index type. TODO(peter): add a more detailed description.
154 : IndexType uint32 `prop:"rocksdb.block.based.table.index.type"`
155 : // For formats >= TableFormatPebblev4, this is set to true if the obsolete
156 : // bit is strict for all the point keys.
157 : IsStrictObsolete bool `prop:"pebble.obsolete.is_strict"`
158 : // The name of the merger used in this table. Empty if no merger is used.
159 : MergerName string `prop:"rocksdb.merge.operator"`
160 : // The number of blocks in this table.
161 : NumDataBlocks uint64 `prop:"rocksdb.num.data.blocks"`
162 : // The number of merge operands in the table.
163 : NumMergeOperands uint64 `prop:"rocksdb.merge.operands"`
164 : // The number of RANGEKEYUNSETs in this table.
165 : NumRangeKeyUnsets uint64 `prop:"pebble.num.range-key-unsets"`
166 : // The number of value blocks in this table. Only serialized if > 0.
167 : NumValueBlocks uint64 `prop:"pebble.num.value-blocks"`
168 : // The number of values stored in value blocks. Only serialized if > 0.
169 : NumValuesInValueBlocks uint64 `prop:"pebble.num.values.in.value-blocks"`
170 : // The name of the prefix extractor used in this table. Empty if no prefix
171 : // extractor is used.
172 : PrefixExtractorName string `prop:"rocksdb.prefix.extractor.name"`
173 : // If filtering is enabled, was the filter created on the key prefix.
174 : PrefixFiltering bool `prop:"rocksdb.block.based.table.prefix.filtering"`
175 : // A comma separated list of names of the property collectors used in this
176 : // table.
177 : PropertyCollectorNames string `prop:"rocksdb.property.collectors"`
178 : // Total raw rangekey key size.
179 : RawRangeKeyKeySize uint64 `prop:"pebble.raw.range-key.key.size"`
180 : // Total raw rangekey value size.
181 : RawRangeKeyValueSize uint64 `prop:"pebble.raw.range-key.value.size"`
182 : // The total number of keys in this table that were pinned by open snapshots.
183 : SnapshotPinnedKeys uint64 `prop:"pebble.num.snapshot-pinned-keys"`
184 : // The cumulative bytes of keys in this table that were pinned by
185 : // open snapshots. This value is comparable to RawKeySize.
186 : SnapshotPinnedKeySize uint64 `prop:"pebble.raw.snapshot-pinned-keys.size"`
187 : // The cumulative bytes of values in this table that were pinned by
188 : // open snapshots. This value is comparable to RawValueSize.
189 : SnapshotPinnedValueSize uint64 `prop:"pebble.raw.snapshot-pinned-values.size"`
190 : // Size of the top-level index if kTwoLevelIndexSearch is used.
191 : TopLevelIndexSize uint64 `prop:"rocksdb.top-level.index.size"`
192 : // User collected properties.
193 : UserProperties map[string]string
194 : // If filtering is enabled, was the filter created on the whole key.
195 : WholeKeyFiltering bool `prop:"rocksdb.block.based.table.whole.key.filtering"`
196 :
197 : // Loaded set indicating which fields have been loaded from disk. Indexed by
198 : // the field's byte offset within the struct
199 : // (reflect.StructField.Offset). Only set if the properties have been loaded
200 : // from a file. Only exported for testing purposes.
201 : Loaded map[uintptr]struct{}
202 : }
203 :
204 : // NumPointDeletions returns the number of point deletions in this table.
205 1 : func (p *Properties) NumPointDeletions() uint64 {
206 1 : return p.NumDeletions - p.NumRangeDeletions
207 1 : }
208 :
209 : // NumRangeKeys returns a count of the number of range keys in this table.
210 1 : func (p *Properties) NumRangeKeys() uint64 {
211 1 : return p.NumRangeKeyDels + p.NumRangeKeySets + p.NumRangeKeyUnsets
212 1 : }
213 :
214 1 : func writeProperties(loaded map[uintptr]struct{}, v reflect.Value, buf *bytes.Buffer) {
215 1 : vt := v.Type()
216 1 : for i := 0; i < v.NumField(); i++ {
217 1 : ft := vt.Field(i)
218 1 : if ft.Type.Kind() == reflect.Struct {
219 1 : // Embedded struct within the properties.
220 1 : writeProperties(loaded, v.Field(i), buf)
221 1 : continue
222 : }
223 1 : tag := ft.Tag.Get("prop")
224 1 : if tag == "" {
225 1 : continue
226 : }
227 :
228 1 : f := v.Field(i)
229 1 : // TODO(peter): Use f.IsZero() when we can rely on go1.13.
230 1 : if zero := reflect.Zero(f.Type()); zero.Interface() == f.Interface() {
231 1 : // Skip printing of zero values which were not loaded from disk.
232 1 : if _, ok := loaded[ft.Offset]; !ok {
233 1 : continue
234 : }
235 : }
236 :
237 1 : fmt.Fprintf(buf, "%s: ", tag)
238 1 : switch ft.Type.Kind() {
239 1 : case reflect.Bool:
240 1 : fmt.Fprintf(buf, "%t\n", f.Bool())
241 1 : case reflect.Uint32:
242 1 : fmt.Fprintf(buf, "%d\n", f.Uint())
243 1 : case reflect.Uint64:
244 1 : fmt.Fprintf(buf, "%d\n", f.Uint())
245 1 : case reflect.String:
246 1 : fmt.Fprintf(buf, "%s\n", f.String())
247 0 : default:
248 0 : panic("not reached")
249 : }
250 : }
251 : }
252 :
253 1 : func (p *Properties) String() string {
254 1 : var buf bytes.Buffer
255 1 : v := reflect.ValueOf(*p)
256 1 : writeProperties(p.Loaded, v, &buf)
257 1 :
258 1 : // Write the UserProperties.
259 1 : keys := make([]string, 0, len(p.UserProperties))
260 1 : for key := range p.UserProperties {
261 1 : keys = append(keys, key)
262 1 : }
263 1 : sort.Strings(keys)
264 1 : for _, key := range keys {
265 1 : fmt.Fprintf(&buf, "%s: %s\n", key, p.UserProperties[key])
266 1 : }
267 1 : return buf.String()
268 : }
269 :
270 : func (p *Properties) load(
271 : b block, blockOffset uint64, deniedUserProperties map[string]struct{},
272 1 : ) error {
273 1 : i, err := newRawBlockIter(bytes.Compare, b)
274 1 : if err != nil {
275 0 : return err
276 0 : }
277 1 : p.Loaded = make(map[uintptr]struct{})
278 1 : v := reflect.ValueOf(p).Elem()
279 1 :
280 1 : for valid := i.First(); valid; valid = i.Next() {
281 1 : if f, ok := propTagMap[string(i.Key().UserKey)]; ok {
282 1 : p.Loaded[f.Offset] = struct{}{}
283 1 : field := v.FieldByIndex(f.Index)
284 1 : switch f.Type.Kind() {
285 1 : case reflect.Bool:
286 1 : field.SetBool(bytes.Equal(i.Value(), propBoolTrue))
287 1 : case reflect.Uint32:
288 1 : field.SetUint(uint64(binary.LittleEndian.Uint32(i.Value())))
289 1 : case reflect.Uint64:
290 1 : var n uint64
291 1 : if string(i.Key().UserKey) == propGlobalSeqnumName {
292 1 : n = binary.LittleEndian.Uint64(i.Value())
293 1 : } else {
294 1 : n, _ = binary.Uvarint(i.Value())
295 1 : }
296 1 : field.SetUint(n)
297 1 : case reflect.String:
298 1 : field.SetString(intern.Bytes(i.Value()))
299 0 : default:
300 0 : panic("not reached")
301 : }
302 1 : continue
303 : }
304 1 : if p.UserProperties == nil {
305 1 : p.UserProperties = make(map[string]string)
306 1 : }
307 :
308 1 : if _, denied := deniedUserProperties[string(i.Key().UserKey)]; !denied {
309 1 : p.UserProperties[intern.Bytes(i.Key().UserKey)] = string(i.Value())
310 1 : }
311 : }
312 1 : return nil
313 : }
314 :
315 1 : func (p *Properties) saveBool(m map[string][]byte, offset uintptr, value bool) {
316 1 : tag := propOffsetTagMap[offset]
317 1 : if value {
318 1 : m[tag] = propBoolTrue
319 1 : } else {
320 1 : m[tag] = propBoolFalse
321 1 : }
322 : }
323 :
324 1 : func (p *Properties) saveUint32(m map[string][]byte, offset uintptr, value uint32) {
325 1 : var buf [4]byte
326 1 : binary.LittleEndian.PutUint32(buf[:], value)
327 1 : m[propOffsetTagMap[offset]] = buf[:]
328 1 : }
329 :
330 1 : func (p *Properties) saveUint64(m map[string][]byte, offset uintptr, value uint64) {
331 1 : var buf [8]byte
332 1 : binary.LittleEndian.PutUint64(buf[:], value)
333 1 : m[propOffsetTagMap[offset]] = buf[:]
334 1 : }
335 :
336 1 : func (p *Properties) saveUvarint(m map[string][]byte, offset uintptr, value uint64) {
337 1 : var buf [10]byte
338 1 : n := binary.PutUvarint(buf[:], value)
339 1 : m[propOffsetTagMap[offset]] = buf[:n]
340 1 : }
341 :
342 1 : func (p *Properties) saveString(m map[string][]byte, offset uintptr, value string) {
343 1 : m[propOffsetTagMap[offset]] = []byte(value)
344 1 : }
345 :
346 1 : func (p *Properties) save(tblFormat TableFormat, w *rawBlockWriter) {
347 1 : m := make(map[string][]byte)
348 1 : for k, v := range p.UserProperties {
349 1 : m[k] = []byte(v)
350 1 : }
351 :
352 1 : if p.ComparerName != "" {
353 1 : p.saveString(m, unsafe.Offsetof(p.ComparerName), p.ComparerName)
354 1 : }
355 1 : if p.CompressionName != "" {
356 1 : p.saveString(m, unsafe.Offsetof(p.CompressionName), p.CompressionName)
357 1 : }
358 1 : if p.CompressionOptions != "" {
359 1 : p.saveString(m, unsafe.Offsetof(p.CompressionOptions), p.CompressionOptions)
360 1 : }
361 1 : p.saveUvarint(m, unsafe.Offsetof(p.DataSize), p.DataSize)
362 1 : if p.ExternalFormatVersion != 0 {
363 1 : p.saveUint32(m, unsafe.Offsetof(p.ExternalFormatVersion), p.ExternalFormatVersion)
364 1 : p.saveUint64(m, unsafe.Offsetof(p.GlobalSeqNum), p.GlobalSeqNum)
365 1 : }
366 1 : if p.FilterPolicyName != "" {
367 1 : p.saveString(m, unsafe.Offsetof(p.FilterPolicyName), p.FilterPolicyName)
368 1 : }
369 1 : p.saveUvarint(m, unsafe.Offsetof(p.FilterSize), p.FilterSize)
370 1 : if p.IndexPartitions != 0 {
371 1 : p.saveUvarint(m, unsafe.Offsetof(p.IndexPartitions), p.IndexPartitions)
372 1 : p.saveUvarint(m, unsafe.Offsetof(p.TopLevelIndexSize), p.TopLevelIndexSize)
373 1 : }
374 1 : p.saveUvarint(m, unsafe.Offsetof(p.IndexSize), p.IndexSize)
375 1 : p.saveUint32(m, unsafe.Offsetof(p.IndexType), p.IndexType)
376 1 : if p.IsStrictObsolete {
377 1 : p.saveBool(m, unsafe.Offsetof(p.IsStrictObsolete), p.IsStrictObsolete)
378 1 : }
379 1 : if p.MergerName != "" {
380 1 : p.saveString(m, unsafe.Offsetof(p.MergerName), p.MergerName)
381 1 : }
382 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumDataBlocks), p.NumDataBlocks)
383 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumEntries), p.NumEntries)
384 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumDeletions), p.NumDeletions)
385 1 : if p.NumSizedDeletions > 0 {
386 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumSizedDeletions), p.NumSizedDeletions)
387 1 : }
388 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumMergeOperands), p.NumMergeOperands)
389 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumRangeDeletions), p.NumRangeDeletions)
390 1 : // NB: We only write out some properties for Pebble formats. This isn't
391 1 : // strictly necessary because unrecognized properties are interpreted as
392 1 : // user-defined properties, however writing them prevents byte-for-byte
393 1 : // equivalence with RocksDB files that some of our testing requires.
394 1 : if p.RawPointTombstoneKeySize > 0 && tblFormat >= TableFormatPebblev1 {
395 1 : p.saveUvarint(m, unsafe.Offsetof(p.RawPointTombstoneKeySize), p.RawPointTombstoneKeySize)
396 1 : }
397 1 : if p.RawPointTombstoneValueSize > 0 {
398 1 : p.saveUvarint(m, unsafe.Offsetof(p.RawPointTombstoneValueSize), p.RawPointTombstoneValueSize)
399 1 : }
400 1 : if p.NumRangeKeys() > 0 {
401 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumRangeKeyDels), p.NumRangeKeyDels)
402 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumRangeKeySets), p.NumRangeKeySets)
403 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumRangeKeyUnsets), p.NumRangeKeyUnsets)
404 1 : p.saveUvarint(m, unsafe.Offsetof(p.RawRangeKeyKeySize), p.RawRangeKeyKeySize)
405 1 : p.saveUvarint(m, unsafe.Offsetof(p.RawRangeKeyValueSize), p.RawRangeKeyValueSize)
406 1 : }
407 1 : if p.NumValueBlocks > 0 {
408 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumValueBlocks), p.NumValueBlocks)
409 1 : }
410 1 : if p.NumValuesInValueBlocks > 0 {
411 1 : p.saveUvarint(m, unsafe.Offsetof(p.NumValuesInValueBlocks), p.NumValuesInValueBlocks)
412 1 : }
413 1 : if p.PrefixExtractorName != "" {
414 1 : p.saveString(m, unsafe.Offsetof(p.PrefixExtractorName), p.PrefixExtractorName)
415 1 : }
416 1 : p.saveBool(m, unsafe.Offsetof(p.PrefixFiltering), p.PrefixFiltering)
417 1 : if p.PropertyCollectorNames != "" {
418 1 : p.saveString(m, unsafe.Offsetof(p.PropertyCollectorNames), p.PropertyCollectorNames)
419 1 : }
420 1 : if p.SnapshotPinnedKeys > 0 {
421 1 : p.saveUvarint(m, unsafe.Offsetof(p.SnapshotPinnedKeys), p.SnapshotPinnedKeys)
422 1 : p.saveUvarint(m, unsafe.Offsetof(p.SnapshotPinnedKeySize), p.SnapshotPinnedKeySize)
423 1 : p.saveUvarint(m, unsafe.Offsetof(p.SnapshotPinnedValueSize), p.SnapshotPinnedValueSize)
424 1 : }
425 1 : p.saveUvarint(m, unsafe.Offsetof(p.RawKeySize), p.RawKeySize)
426 1 : p.saveUvarint(m, unsafe.Offsetof(p.RawValueSize), p.RawValueSize)
427 1 : if p.ValueBlocksSize > 0 {
428 1 : p.saveUvarint(m, unsafe.Offsetof(p.ValueBlocksSize), p.ValueBlocksSize)
429 1 : }
430 1 : p.saveBool(m, unsafe.Offsetof(p.WholeKeyFiltering), p.WholeKeyFiltering)
431 1 :
432 1 : if tblFormat < TableFormatPebblev1 {
433 1 : m["rocksdb.column.family.id"] = binary.AppendUvarint([]byte(nil), math.MaxInt32)
434 1 : m["rocksdb.fixed.key.length"] = []byte{0x00}
435 1 : m["rocksdb.index.key.is.user.key"] = []byte{0x00}
436 1 : m["rocksdb.index.value.is.delta.encoded"] = []byte{0x00}
437 1 : m["rocksdb.oldest.key.time"] = []byte{0x00}
438 1 : m["rocksdb.creation.time"] = []byte{0x00}
439 1 : m["rocksdb.format.version"] = []byte{0x00}
440 1 : }
441 :
442 1 : keys := make([]string, 0, len(m))
443 1 : for key := range m {
444 1 : keys = append(keys, key)
445 1 : }
446 1 : sort.Strings(keys)
447 1 : for _, key := range keys {
448 1 : w.add(InternalKey{UserKey: []byte(key)}, m[key])
449 1 : }
450 : }
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