-
Notifications
You must be signed in to change notification settings - Fork 2k
/
rowstreamer.go
460 lines (416 loc) · 13.3 KB
/
rowstreamer.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
/*
Copyright 2019 The Vitess Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package vstreamer
import (
"context"
"fmt"
"net/url"
"sync"
"time"
"vitess.io/vitess/go/mysql/collations"
"vitess.io/vitess/go/sqlescape"
"vitess.io/vitess/go/sqltypes"
"vitess.io/vitess/go/textutil"
"vitess.io/vitess/go/timer"
"vitess.io/vitess/go/vt/dbconfigs"
"vitess.io/vitess/go/vt/log"
"vitess.io/vitess/go/vt/logutil"
"vitess.io/vitess/go/vt/sqlparser"
"vitess.io/vitess/go/vt/vterrors"
"vitess.io/vitess/go/vt/vttablet"
"vitess.io/vitess/go/vt/vttablet/tabletserver/schema"
"vitess.io/vitess/go/vt/vttablet/tabletserver/throttle/throttlerapp"
binlogdatapb "vitess.io/vitess/go/vt/proto/binlogdata"
querypb "vitess.io/vitess/go/vt/proto/query"
vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc"
)
var (
rowStreamertHeartbeatInterval = 10 * time.Second
)
type RowStreamerMode int32
const (
RowStreamerModeSingleTable RowStreamerMode = iota
RowStreamerModeAllTables
)
// rowStreamer is used for copying the existing rows of a table
// before vreplication begins streaming binlogs. The rowStreamer
// responds to a request with the GTID position as of which it
// streams the rows of a table. This allows vreplication to synchronize
// its events as of the returned GTID before adding the new rows.
// For every set of rows sent, the last pk value is also sent.
// This allows for the streaming to be resumed based on the last
// pk value processed.
type rowStreamer struct {
ctx context.Context
cancel func()
cp dbconfigs.Connector
se *schema.Engine
query string
lastpk []sqltypes.Value
send func(*binlogdatapb.VStreamRowsResponse) error
vschema *localVSchema
plan *Plan
pkColumns []int
ukColumnNames []string
sendQuery string
vse *Engine
pktsize PacketSizer
mode RowStreamerMode
conn *snapshotConn
}
func newRowStreamer(ctx context.Context, cp dbconfigs.Connector, se *schema.Engine, query string,
lastpk []sqltypes.Value, vschema *localVSchema, send func(*binlogdatapb.VStreamRowsResponse) error, vse *Engine,
mode RowStreamerMode, conn *snapshotConn) *rowStreamer {
ctx, cancel := context.WithCancel(ctx)
return &rowStreamer{
ctx: ctx,
cancel: cancel,
cp: cp,
se: se,
query: query,
lastpk: lastpk,
send: send,
vschema: vschema,
vse: vse,
pktsize: DefaultPacketSizer(),
mode: mode,
conn: conn,
}
}
func (rs *rowStreamer) Cancel() {
log.Info("Rowstreamer Cancel() called")
rs.cancel()
}
func (rs *rowStreamer) Stream() error {
// Ensure se is Open. If vttablet came up in a non_serving role,
// the schema engine may not have been initialized.
if err := rs.se.Open(); err != nil {
return err
}
if err := rs.buildPlan(); err != nil {
return err
}
if rs.conn == nil {
conn, err := snapshotConnect(rs.ctx, rs.cp)
if err != nil {
return err
}
rs.conn = conn
defer rs.conn.Close()
if _, err := rs.conn.ExecuteFetch("set names 'binary'", 1, false); err != nil {
return err
}
if _, err := conn.ExecuteFetch(fmt.Sprintf("set @@session.net_read_timeout = %v", vttablet.VReplicationNetReadTimeout), 1, false); err != nil {
return err
}
if _, err := conn.ExecuteFetch(fmt.Sprintf("set @@session.net_write_timeout = %v", vttablet.VReplicationNetWriteTimeout), 1, false); err != nil {
return err
}
}
return rs.streamQuery(rs.send)
}
func (rs *rowStreamer) buildPlan() error {
// This pre-parsing is required to extract the table name
// and create its metadata.
sel, fromTable, err := analyzeSelect(rs.query, rs.se.Environment().Parser())
if err != nil {
return err
}
st, err := rs.se.GetTableForPos(rs.ctx, fromTable, "")
if err != nil {
return err
}
ti := &Table{
Name: st.Name,
}
ti.Fields, err = getFields(rs.ctx, rs.cp, rs.vse.se, st.Name, rs.cp.DBName(), st.Fields)
if err != nil {
return err
}
// The plan we build is identical to the one for vstreamer.
// This is because the row format of a read is identical
// to the row format of a binlog event. So, the same
// filtering will work.
rs.plan, err = buildTablePlan(rs.se.Environment(), ti, rs.vschema, rs.query)
if err != nil {
log.Errorf("%s", err.Error())
return err
}
directives := sel.Comments.Directives()
if s, found := directives.GetString("ukColumns", ""); found {
rs.ukColumnNames, err = textutil.SplitUnescape(s, ",")
if err != nil {
return err
}
}
if s, found := directives.GetString("ukForce", ""); found {
st.PKIndexName, err = url.QueryUnescape(s)
if err != nil {
return err
}
}
rs.pkColumns, err = rs.buildPKColumns(st)
if err != nil {
return err
}
rs.sendQuery, err = rs.buildSelect(st)
if err != nil {
return err
}
return err
}
// buildPKColumnsFromUniqueKey assumes a unique key is indicated,
func (rs *rowStreamer) buildPKColumnsFromUniqueKey() ([]int, error) {
var pkColumns = make([]int, 0)
// We wish to utilize a UNIQUE KEY which is not the PRIMARY KEY/
for _, colName := range rs.ukColumnNames {
index := rs.plan.Table.FindColumn(sqlparser.NewIdentifierCI(colName))
if index < 0 {
return pkColumns, vterrors.Errorf(vtrpcpb.Code_INTERNAL, "column %v is listed as unique key, but not present in table %v", colName, rs.plan.Table.Name)
}
pkColumns = append(pkColumns, index)
}
return pkColumns, nil
}
func (rs *rowStreamer) buildPKColumns(st *binlogdatapb.MinimalTable) ([]int, error) {
if len(rs.ukColumnNames) > 0 {
return rs.buildPKColumnsFromUniqueKey()
}
var pkColumns = make([]int, 0)
if len(st.PKColumns) == 0 {
// Use a PK equivalent if one exists.
pkColumns, err := rs.vse.mapPKEquivalentCols(rs.ctx, rs.cp, st)
if err == nil && len(pkColumns) != 0 {
return pkColumns, nil
}
// Fall back to using every column in the table if there's no PK or PKE.
pkColumns = make([]int, len(st.Fields))
for i := range st.Fields {
pkColumns[i] = i
}
return pkColumns, nil
}
for _, pk := range st.PKColumns {
if pk >= int64(len(st.Fields)) {
return nil, fmt.Errorf("primary key %d refers to non-existent column", pk)
}
pkColumns = append(pkColumns, int(pk))
}
st.PKIndexName = "PRIMARY"
return pkColumns, nil
}
func (rs *rowStreamer) buildSelect(st *binlogdatapb.MinimalTable) (string, error) {
buf := sqlparser.NewTrackedBuffer(nil)
// We could have used select *, but being explicit is more predictable.
buf.Myprintf("select %s", GetVReplicationMaxExecutionTimeQueryHint())
prefix := ""
for _, col := range rs.plan.Table.Fields {
if rs.plan.isConvertColumnUsingUTF8(col.Name) {
buf.Myprintf("%sconvert(%v using utf8mb4) as %v", prefix, sqlparser.NewIdentifierCI(col.Name), sqlparser.NewIdentifierCI(col.Name))
} else if funcExpr := rs.plan.getColumnFuncExpr(col.Name); funcExpr != nil {
buf.Myprintf("%s%s as %v", prefix, sqlparser.String(funcExpr), sqlparser.NewIdentifierCI(col.Name))
} else {
buf.Myprintf("%s%v", prefix, sqlparser.NewIdentifierCI(col.Name))
}
prefix = ", "
}
// If we know the index name that we should be using then tell MySQL
// to use it if possible. This helps to ensure that we are able to
// leverage the ordering from the index itself and avoid having to
// do a FILESORT of all the results. This index should contain all
// of the PK columns which are used in the ORDER BY clause below.
var indexHint string
if st.PKIndexName != "" {
escapedPKIndexName, err := sqlescape.EnsureEscaped(st.PKIndexName)
if err != nil {
return "", err
}
indexHint = fmt.Sprintf(" force index (%s)", escapedPKIndexName)
}
buf.Myprintf(" from %v%s", sqlparser.NewIdentifierCS(rs.plan.Table.Name), indexHint)
if len(rs.lastpk) != 0 {
if len(rs.lastpk) != len(rs.pkColumns) {
return "", fmt.Errorf("primary key values don't match length: %v vs %v", rs.lastpk, rs.pkColumns)
}
buf.WriteString(" where ")
prefix := ""
// This loop handles the case for composite PKs. For example,
// if lastpk was (1,2), the where clause would be:
// (col1 = 1 and col2 > 2) or (col1 > 1).
// A tuple inequality like (col1,col2) > (1,2) ends up
// being a full table scan for MySQL.
for lastcol := len(rs.pkColumns) - 1; lastcol >= 0; lastcol-- {
buf.Myprintf("%s(", prefix)
prefix = " or "
for i, pk := range rs.pkColumns[:lastcol] {
buf.Myprintf("%v = ", sqlparser.NewIdentifierCI(rs.plan.Table.Fields[pk].Name))
rs.lastpk[i].EncodeSQL(buf)
buf.Myprintf(" and ")
}
buf.Myprintf("%v > ", sqlparser.NewIdentifierCI(rs.plan.Table.Fields[rs.pkColumns[lastcol]].Name))
rs.lastpk[lastcol].EncodeSQL(buf)
buf.Myprintf(")")
}
}
buf.Myprintf(" order by ", sqlparser.NewIdentifierCS(rs.plan.Table.Name))
prefix = ""
for _, pk := range rs.pkColumns {
buf.Myprintf("%s%v", prefix, sqlparser.NewIdentifierCI(rs.plan.Table.Fields[pk].Name))
prefix = ", "
}
return buf.String(), nil
}
func (rs *rowStreamer) streamQuery(send func(*binlogdatapb.VStreamRowsResponse) error) error {
throttleResponseRateLimiter := timer.NewRateLimiter(rowStreamertHeartbeatInterval)
defer throttleResponseRateLimiter.Stop()
var sendMu sync.Mutex
safeSend := func(r *binlogdatapb.VStreamRowsResponse) error {
sendMu.Lock()
defer sendMu.Unlock()
return send(r)
}
// Let's wait until MySQL is in good shape to stream rows
if err := rs.vse.waitForMySQL(rs.ctx, rs.cp, rs.plan.Table.Name); err != nil {
return err
}
var (
gtid string
rotatedLog bool
err error
)
log.Infof("Streaming query: %v\n", rs.sendQuery)
if rs.mode == RowStreamerModeSingleTable {
gtid, rotatedLog, err = rs.conn.streamWithSnapshot(rs.ctx, rs.plan.Table.Name, rs.sendQuery)
if err != nil {
return err
}
if rotatedLog {
rs.vse.vstreamerFlushedBinlogs.Add(1)
}
} else {
// Comes here when we stream all tables. The snapshot is created just once at the start.
if err := rs.conn.ExecuteStreamFetch(rs.query); err != nil {
return err
}
}
pkfields := make([]*querypb.Field, len(rs.pkColumns))
for i, pk := range rs.pkColumns {
pkfields[i] = &querypb.Field{
Name: rs.plan.Table.Fields[pk].Name,
Type: rs.plan.Table.Fields[pk].Type,
Charset: rs.plan.Table.Fields[pk].Charset,
Flags: rs.plan.Table.Fields[pk].Flags,
}
}
charsets := make([]collations.ID, len(rs.plan.Table.Fields))
for i, fld := range rs.plan.Table.Fields {
charsets[i] = collations.ID(fld.Charset)
}
err = safeSend(&binlogdatapb.VStreamRowsResponse{
Fields: rs.plan.fields(),
Pkfields: pkfields,
Gtid: gtid,
})
if err != nil {
return fmt.Errorf("stream send error: %v", err)
}
// streamQuery sends heartbeats as long as it operates
heartbeatTicker := time.NewTicker(rowStreamertHeartbeatInterval)
defer heartbeatTicker.Stop()
go func() {
select {
case <-rs.ctx.Done():
return
case <-heartbeatTicker.C:
safeSend(&binlogdatapb.VStreamRowsResponse{Heartbeat: true})
}
}()
var (
response binlogdatapb.VStreamRowsResponse
rows []*querypb.Row
rowCount int
mysqlrow []sqltypes.Value
)
filtered := make([]sqltypes.Value, len(rs.plan.ColExprs))
lastpk := make([]sqltypes.Value, len(rs.pkColumns))
byteCount := 0
logger := logutil.NewThrottledLogger(rs.vse.GetTabletInfo(), throttledLoggerInterval)
for {
if rs.ctx.Err() != nil {
log.Infof("Stream ended because of ctx.Done")
return fmt.Errorf("stream ended: %v", rs.ctx.Err())
}
// check throttler.
if !rs.vse.throttlerClient.ThrottleCheckOKOrWaitAppName(rs.ctx, throttlerapp.RowStreamerName) {
throttleResponseRateLimiter.Do(func() error {
return safeSend(&binlogdatapb.VStreamRowsResponse{Throttled: true})
})
logger.Infof("throttled.")
continue
}
if mysqlrow != nil {
mysqlrow = mysqlrow[:0]
}
mysqlrow, err = rs.conn.FetchNext(mysqlrow)
if err != nil {
return err
}
if mysqlrow == nil {
break
}
// Compute lastpk here, because we'll need it
// at the end after the loop exits.
for i, pk := range rs.pkColumns {
lastpk[i] = mysqlrow[pk]
}
// Reuse the vstreamer's filter.
ok, err := rs.plan.filter(mysqlrow, filtered, charsets)
if err != nil {
return err
}
if ok {
if rowCount >= len(rows) {
rows = append(rows, &querypb.Row{})
}
byteCount += sqltypes.RowToProto3Inplace(filtered, rows[rowCount])
rowCount++
}
if rs.pktsize.ShouldSend(byteCount) {
response.Rows = rows[:rowCount]
response.Lastpk = sqltypes.RowToProto3(lastpk)
rs.vse.rowStreamerNumRows.Add(int64(len(response.Rows)))
rs.vse.rowStreamerNumPackets.Add(int64(1))
startSend := time.Now()
err = safeSend(&response)
if err != nil {
return err
}
rs.pktsize.Record(byteCount, time.Since(startSend))
rowCount = 0
byteCount = 0
}
}
if rowCount > 0 {
response.Rows = rows[:rowCount]
response.Lastpk = sqltypes.RowToProto3(lastpk)
rs.vse.rowStreamerNumRows.Add(int64(len(response.Rows)))
err = safeSend(&response)
if err != nil {
return err
}
}
return nil
}
func GetVReplicationMaxExecutionTimeQueryHint() string {
return fmt.Sprintf("/*+ MAX_EXECUTION_TIME(%v) */ ", vttablet.CopyPhaseDuration.Milliseconds())
}