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kafka(ticdc): support columns dispatcher. (pingcap#9863)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package partition | ||
|
|
||
| import ( | ||
| "strconv" | ||
| "sync" | ||
|
|
||
| "github.com/pingcap/log" | ||
| "github.com/pingcap/tiflow/cdc/model" | ||
| "github.com/pingcap/tiflow/pkg/errors" | ||
| "github.com/pingcap/tiflow/pkg/hash" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| // ColumnsDispatcher is a partition dispatcher | ||
| // which dispatches events based on the given columns. | ||
| type ColumnsDispatcher struct { | ||
| hasher *hash.PositionInertia | ||
| lock sync.Mutex | ||
|
|
||
| Columns []string | ||
| } | ||
|
|
||
| // NewColumnsDispatcher creates a ColumnsDispatcher. | ||
| func NewColumnsDispatcher(columns []string) *ColumnsDispatcher { | ||
| return &ColumnsDispatcher{ | ||
| hasher: hash.NewPositionInertia(), | ||
| Columns: columns, | ||
| } | ||
| } | ||
|
|
||
| // DispatchRowChangedEvent returns the target partition to which | ||
| // a row changed event should be dispatched. | ||
| func (r *ColumnsDispatcher) DispatchRowChangedEvent(row *model.RowChangedEvent, partitionNum int32) (int32, string, error) { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
| r.hasher.Reset() | ||
|
|
||
| r.hasher.Write([]byte(row.Table.Schema), []byte(row.Table.Table)) | ||
|
|
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| dispatchCols := row.Columns | ||
| if len(dispatchCols) == 0 { | ||
| dispatchCols = row.PreColumns | ||
| } | ||
|
|
||
| offsets, ok := row.TableInfo.ColumnsByNames(r.Columns) | ||
| if !ok { | ||
| log.Error("columns not found when dispatch event", | ||
| zap.Any("tableName", row.Table), | ||
| zap.Strings("columns", r.Columns)) | ||
| return 0, "", errors.ErrDispatcherFailed.GenWithStack( | ||
| "columns not found when dispatch event, table: %v, columns: %v", row.Table, r.Columns) | ||
| } | ||
|
|
||
| for idx := 0; idx < len(r.Columns); idx++ { | ||
| r.hasher.Write([]byte(r.Columns[idx]), []byte(model.ColumnValueString(dispatchCols[offsets[idx]].Value))) | ||
| } | ||
|
|
||
| sum32 := r.hasher.Sum32() | ||
| return int32(sum32 % uint32(partitionNum)), strconv.FormatInt(int64(sum32), 10), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package partition | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| timodel "github.com/pingcap/tidb/parser/model" | ||
| "github.com/pingcap/tiflow/cdc/model" | ||
| "github.com/pingcap/tiflow/pkg/errors" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestColumnsDispatcher(t *testing.T) { | ||
| t.Parallel() | ||
|
|
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| event := &model.RowChangedEvent{ | ||
| Table: &model.TableName{ | ||
| Schema: "test", | ||
| Table: "t1", | ||
| }, | ||
| TableInfo: &model.TableInfo{ | ||
| TableInfo: &timodel.TableInfo{ | ||
| Columns: []*timodel.ColumnInfo{ | ||
| { | ||
| Name: timodel.CIStr{ | ||
| O: "col2", | ||
| }, | ||
| Offset: 1, | ||
| }, | ||
| { | ||
| Name: timodel.CIStr{ | ||
| O: "col1", | ||
| }, | ||
| Offset: 0, | ||
| }, | ||
| { | ||
| Name: timodel.CIStr{ | ||
| O: "col3", | ||
| }, | ||
| Offset: 2, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| Columns: []*model.Column{ | ||
| { | ||
| Name: "col1", | ||
| Value: 11, | ||
| }, | ||
| { | ||
| Name: "col2", | ||
| Value: 22, | ||
| }, | ||
| { | ||
| Name: "col3", | ||
| Value: 33, | ||
| }, | ||
| }, | ||
| } | ||
|
|
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| p := NewColumnsDispatcher([]string{"col-2", "col-not-found"}) | ||
| _, _, err := p.DispatchRowChangedEvent(event, 16) | ||
| require.ErrorIs(t, err, errors.ErrDispatcherFailed) | ||
|
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| p = NewColumnsDispatcher([]string{"col2", "col1"}) | ||
| index, _, err := p.DispatchRowChangedEvent(event, 16) | ||
| require.NoError(t, err) | ||
| require.Equal(t, int32(15), index) | ||
| } |
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