ttl: submit ttl scan task to the system table #40422
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| // Copyright 2023 PingCAP, Inc. | ||
| // | ||
| // 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. | ||
|
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| package cache | ||
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| import ( | ||
| "encoding/json" | ||
| "time" | ||
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| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| "github.com/pingcap/tidb/util/codec" | ||
| ) | ||
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| const selectFromTTLTask = `SELECT LOW_PRIORITY | ||
| job_id, | ||
| table_id, | ||
| scan_id, | ||
| scan_range_start, | ||
| scan_range_end, | ||
| expire_time, | ||
| owner_id, | ||
| owner_addr, | ||
| owner_hb_time, | ||
| status, | ||
| status_update_time, | ||
| state, | ||
| created_time FROM mysql.tidb_ttl_task` | ||
| const insertIntoTTLTask = `INSERT LOW_PRIORITY INTO mysql.tidb_ttl_task SET | ||
| job_id = %?, | ||
| table_id = %?, | ||
| scan_id = %?, | ||
| scan_range_start = %?, | ||
| scan_range_end = %?, | ||
| expire_time = %?, | ||
| created_time = %?` | ||
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| // SelectFromTTLTaskWithID returns an SQL statement to get all tasks of the specified job in mysql.tidb_ttl_task | ||
| func SelectFromTTLTaskWithID(jobID string) (string, []interface{}) { | ||
| return selectFromTTLTask + " WHERE job_id = %?", []interface{}{jobID} | ||
| } | ||
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| // InsertIntoTTLTask returns an SQL statement to insert a ttl task into mysql.tidb_ttl_task | ||
| func InsertIntoTTLTask(sctx sessionctx.Context, jobID string, tableID int64, scanID int, scanRangeStart []types.Datum, scanRangeEnd []types.Datum, expireTime time.Time, createdTime time.Time) (string, []interface{}, error) { | ||
| rangeStart, err := codec.EncodeKey(sctx.GetSessionVars().StmtCtx, []byte{}, scanRangeStart...) | ||
| if err != nil { | ||
| return "", nil, err | ||
| } | ||
| rangeEnd, err := codec.EncodeKey(sctx.GetSessionVars().StmtCtx, []byte{}, scanRangeEnd...) | ||
| if err != nil { | ||
| return "", nil, err | ||
| } | ||
| return insertIntoTTLTask, []interface{}{jobID, tableID, int64(scanID), rangeStart, rangeEnd, expireTime, createdTime}, nil | ||
| } | ||
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| // TaskStatus represents the current status of a task | ||
| type TaskStatus string | ||
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| const ( | ||
| // TaskStatusWaiting means the task hasn't started | ||
| TaskStatusWaiting TaskStatus = "waiting" | ||
| // TaskStatusRunning means this task is running | ||
| TaskStatusRunning = "running" | ||
| // TaskStatusFinished means this task has finished | ||
| TaskStatusFinished = "finished" | ||
| ) | ||
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| // TTLTask is a row recorded in mysql.tidb_ttl_task | ||
| type TTLTask struct { | ||
| JobID string | ||
| TableID int64 | ||
| ScanID int64 | ||
| ScanRangeStart []types.Datum | ||
| ScanRangeEnd []types.Datum | ||
| ExpireTime time.Time | ||
| OwnerID string | ||
| OwnerAddr string | ||
| OwnerHBTime time.Time | ||
| Status TaskStatus | ||
| StatusUpdateTime time.Time | ||
| State *TTLTaskState | ||
| CreatedTime time.Time | ||
| } | ||
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| // TTLTaskState records the internal states of the ttl task | ||
| type TTLTaskState struct { | ||
| TotalRows uint64 `json:"total_rows"` | ||
| SuccessRows uint64 `json:"success_rows"` | ||
| ErrorRows uint64 `json:"error_rows"` | ||
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| ScanTaskErr string `json:"scan_task_err"` | ||
| } | ||
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| // RowToTTLTask converts a row into TTL task | ||
| func RowToTTLTask(sctx sessionctx.Context, row chunk.Row) (*TTLTask, error) { | ||
| var err error | ||
| timeZone := sctx.GetSessionVars().Location() | ||
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| task := &TTLTask{ | ||
| JobID: row.GetString(0), | ||
| TableID: row.GetInt64(1), | ||
| ScanID: row.GetInt64(2), | ||
| } | ||
| if !row.IsNull(3) { | ||
| scanRangeStartBuf := row.GetBytes(3) | ||
| // it's still posibble to be nil even this column is not NULL | ||
| if scanRangeStartBuf != nil { | ||
| task.ScanRangeStart, err = codec.Decode(scanRangeStartBuf, len(scanRangeStartBuf)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| } | ||
| if !row.IsNull(4) { | ||
| scanRangeEndBuf := row.GetBytes(4) | ||
| // it's still posibble to be nil even this column is not NULL | ||
| if scanRangeEndBuf != nil { | ||
| task.ScanRangeEnd, err = codec.Decode(scanRangeEndBuf, len(scanRangeEndBuf)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| } | ||
|
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| task.ExpireTime, err = row.GetTime(5).GoTime(timeZone) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| if !row.IsNull(6) { | ||
| task.OwnerID = row.GetString(6) | ||
| } | ||
| if !row.IsNull(7) { | ||
| task.OwnerAddr = row.GetString(7) | ||
| } | ||
| if !row.IsNull(8) { | ||
| task.OwnerHBTime, err = row.GetTime(8).GoTime(timeZone) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| if !row.IsNull(9) { | ||
| status := row.GetString(9) | ||
| if len(status) == 0 { | ||
| status = "waiting" | ||
| } | ||
| task.Status = TaskStatus(status) | ||
| } | ||
| if !row.IsNull(10) { | ||
| task.StatusUpdateTime, err = row.GetTime(10).GoTime(timeZone) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| if !row.IsNull(11) { | ||
| stateStr := row.GetString(11) | ||
| state := &TTLTaskState{} | ||
| err = json.Unmarshal([]byte(stateStr), state) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| task.State = state | ||
| } | ||
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| task.CreatedTime, err = row.GetTime(12).GoTime(timeZone) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return task, nil | ||
| } |
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When
rowcodec.IsNewFormat(m.Value), the previous code are deleted?There was a problem hiding this comment.
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Here it sets
reqCtx.buf = m.Valueand laterlock.Value = reqCtx.buf. The main purpose is to setlock.Value = m.Value. In https://github.com/pingcap/tidb/pull/40422/files/f2fe4bde5508cad89d582145709fa286a24bec18#diff-c8058e505bb9be555aca4f1a51fbf20e712ea4d6d89812a09f3ebf02ff99e2f2R896, thelock.Valuehas been initialized withm.Value, so there is no need to assign again.