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This is an automated cherry-pick of pingcap#3902
Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
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// Copyright 2021 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, | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package util | ||
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import ( | ||
"github.com/pingcap/log" | ||
"github.com/pingcap/ticdc/cdc/model" | ||
"go.uber.org/zap" | ||
) | ||
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// TableSet provides a data structure to store the tables' states for the | ||
// scheduler. | ||
type TableSet struct { | ||
// all tables' records | ||
tableIDMap map[model.TableID]*TableRecord | ||
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// a non-unique index to facilitate looking up tables | ||
// assigned to a given capture. | ||
captureIndex map[model.CaptureID]map[model.TableID]*TableRecord | ||
} | ||
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// TableRecord is a record to be inserted into TableSet. | ||
type TableRecord struct { | ||
TableID model.TableID | ||
CaptureID model.CaptureID | ||
Status TableStatus | ||
} | ||
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// Clone returns a copy of the TableSet. | ||
// This method is future-proof in case we add | ||
// something not trivially copyable. | ||
func (r *TableRecord) Clone() *TableRecord { | ||
return &TableRecord{ | ||
TableID: r.TableID, | ||
CaptureID: r.CaptureID, | ||
Status: r.Status, | ||
} | ||
} | ||
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// TableStatus is a type representing the table's replication status. | ||
type TableStatus int32 | ||
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const ( | ||
AddingTable = TableStatus(iota) + 1 | ||
RemovingTable | ||
RunningTable | ||
) | ||
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// NewTableSet creates a new TableSet. | ||
func NewTableSet() *TableSet { | ||
return &TableSet{ | ||
tableIDMap: map[model.TableID]*TableRecord{}, | ||
captureIndex: map[model.CaptureID]map[model.TableID]*TableRecord{}, | ||
} | ||
} | ||
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// AddTableRecord inserts a new TableRecord. | ||
// It returns true if it succeeds. Returns false if there is a duplicate. | ||
func (s *TableSet) AddTableRecord(record *TableRecord) (successful bool) { | ||
if _, ok := s.tableIDMap[record.TableID]; ok { | ||
// duplicate tableID | ||
return false | ||
} | ||
recordCloned := record.Clone() | ||
s.tableIDMap[record.TableID] = recordCloned | ||
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captureIndexEntry := s.captureIndex[record.CaptureID] | ||
if captureIndexEntry == nil { | ||
captureIndexEntry = make(map[model.TableID]*TableRecord) | ||
s.captureIndex[record.CaptureID] = captureIndexEntry | ||
} | ||
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captureIndexEntry[record.TableID] = recordCloned | ||
return true | ||
} | ||
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// UpdateTableRecord updates an existing TableRecord. | ||
// All modifications to a table's status should be done by this method. | ||
func (s *TableSet) UpdateTableRecord(record *TableRecord) (successful bool) { | ||
oldRecord, ok := s.tableIDMap[record.TableID] | ||
if !ok { | ||
// table does not exist | ||
return false | ||
} | ||
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// If there is no need to modify the CaptureID, we simply | ||
// update the record. | ||
if record.CaptureID == oldRecord.CaptureID { | ||
recordCloned := record.Clone() | ||
s.tableIDMap[record.TableID] = recordCloned | ||
s.captureIndex[record.CaptureID][record.TableID] = recordCloned | ||
return true | ||
} | ||
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// If the CaptureID is changed, we do a proper RemoveTableRecord followed | ||
// by AddTableRecord. | ||
if record.CaptureID != oldRecord.CaptureID { | ||
if ok := s.RemoveTableRecord(record.TableID); !ok { | ||
log.Panic("unreachable", zap.Any("record", record)) | ||
} | ||
if ok := s.AddTableRecord(record); !ok { | ||
log.Panic("unreachable", zap.Any("record", record)) | ||
} | ||
} | ||
return true | ||
} | ||
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// GetTableRecord tries to obtain a record with the specified tableID. | ||
func (s *TableSet) GetTableRecord(tableID model.TableID) (*TableRecord, bool) { | ||
rec, ok := s.tableIDMap[tableID] | ||
if ok { | ||
return rec.Clone(), ok | ||
} | ||
return nil, false | ||
} | ||
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// RemoveTableRecord removes the record with tableID. Returns false | ||
// if none exists. | ||
func (s *TableSet) RemoveTableRecord(tableID model.TableID) bool { | ||
record, ok := s.tableIDMap[tableID] | ||
if !ok { | ||
return false | ||
} | ||
delete(s.tableIDMap, record.TableID) | ||
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captureIndexEntry, ok := s.captureIndex[record.CaptureID] | ||
if !ok { | ||
log.Panic("unreachable", zap.Int64("table-id", tableID)) | ||
} | ||
delete(captureIndexEntry, record.TableID) | ||
if len(captureIndexEntry) == 0 { | ||
delete(s.captureIndex, record.CaptureID) | ||
} | ||
return true | ||
} | ||
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// RemoveTableRecordByCaptureID removes all table records associated with | ||
// captureID. | ||
func (s *TableSet) RemoveTableRecordByCaptureID(captureID model.CaptureID) []*TableRecord { | ||
captureIndexEntry, ok := s.captureIndex[captureID] | ||
if !ok { | ||
return nil | ||
} | ||
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var ret []*TableRecord | ||
for tableID, record := range captureIndexEntry { | ||
delete(s.tableIDMap, tableID) | ||
// Since the record has been removed, | ||
// there is no need to clone it before returning. | ||
ret = append(ret, record) | ||
} | ||
delete(s.captureIndex, captureID) | ||
return ret | ||
} | ||
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// CountTableByCaptureID counts the number of tables associated with the captureID. | ||
func (s *TableSet) CountTableByCaptureID(captureID model.CaptureID) int { | ||
return len(s.captureIndex[captureID]) | ||
} | ||
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// GetDistinctCaptures counts distinct captures with tables. | ||
func (s *TableSet) GetDistinctCaptures() []model.CaptureID { | ||
var ret []model.CaptureID | ||
for captureID := range s.captureIndex { | ||
ret = append(ret, captureID) | ||
} | ||
return ret | ||
} | ||
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// GetAllTables returns all stored information on all tables. | ||
func (s *TableSet) GetAllTables() map[model.TableID]*TableRecord { | ||
ret := make(map[model.TableID]*TableRecord) | ||
for tableID, record := range s.tableIDMap { | ||
ret[tableID] = record.Clone() | ||
} | ||
return ret | ||
} | ||
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// GetAllTablesGroupedByCaptures returns all stored information grouped by associated CaptureID. | ||
func (s *TableSet) GetAllTablesGroupedByCaptures() map[model.CaptureID]map[model.TableID]*TableRecord { | ||
ret := make(map[model.CaptureID]map[model.TableID]*TableRecord) | ||
for captureID, tableIDMap := range s.captureIndex { | ||
tableIDMapCloned := make(map[model.TableID]*TableRecord) | ||
for tableID, record := range tableIDMap { | ||
tableIDMapCloned[tableID] = record.Clone() | ||
} | ||
ret[captureID] = tableIDMapCloned | ||
} | ||
return ret | ||
} | ||
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// CountTableByStatus counts the number of tables with the given status. | ||
func (s *TableSet) CountTableByStatus(status TableStatus) (count int) { | ||
for _, record := range s.tableIDMap { | ||
if record.Status == status { | ||
count++ | ||
} | ||
} | ||
return | ||
} |
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