68 lines
2.0 KiB
Go
68 lines
2.0 KiB
Go
// Copyright 2017 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tikv
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import (
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"bytes"
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"context"
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"github.com/pingcap/errors"
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"github.com/pingcap/kvproto/pkg/kvrpcpb"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/store/tikv/tikvrpc"
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log "github.com/sirupsen/logrus"
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)
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// SplitRegion splits the region contains splitKey into 2 regions: [start,
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// splitKey) and [splitKey, end).
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func (s *tikvStore) SplitRegion(splitKey kv.Key) error {
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log.Infof("start split_region at %q", splitKey)
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bo := NewBackoffer(context.Background(), splitRegionBackoff)
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sender := NewRegionRequestSender(s.regionCache, s.client)
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req := &tikvrpc.Request{
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Type: tikvrpc.CmdSplitRegion,
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SplitRegion: &kvrpcpb.SplitRegionRequest{
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SplitKey: splitKey,
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},
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}
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req.Context.Priority = kvrpcpb.CommandPri_Normal
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for {
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loc, err := s.regionCache.LocateKey(bo, splitKey)
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if err != nil {
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return errors.Trace(err)
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}
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if bytes.Equal(splitKey, loc.StartKey) {
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log.Infof("skip split_region region at %q", splitKey)
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return nil
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}
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res, err := sender.SendReq(bo, req, loc.Region, readTimeoutShort)
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if err != nil {
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return errors.Trace(err)
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}
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regionErr, err := res.GetRegionError()
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if err != nil {
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return errors.Trace(err)
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}
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if regionErr != nil {
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err := bo.Backoff(BoRegionMiss, errors.New(regionErr.String()))
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if err != nil {
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return errors.Trace(err)
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}
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continue
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}
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log.Infof("split_region at %q complete, new regions: %v, %v", splitKey, res.SplitRegion.GetLeft(), res.SplitRegion.GetRight())
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return nil
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}
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}
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