github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/pingcap/tidb/store/tikv/error.go (about)

     1  // Copyright 2016 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package tikv
    15  
    16  import (
    17  	"github.com/insionng/yougam/libraries/juju/errors"
    18  	pb "github.com/insionng/yougam/libraries/pingcap/kvproto/pkg/kvrpcpb"
    19  )
    20  
    21  var (
    22  	// errInnerRetryable if caller can retry this directly then return this error.
    23  	errInnerRetryable = errors.New("try again innerly")
    24  	// errInvalidResponse represents response message is invalid.
    25  	errInvalidResponse = errors.New("invalid response")
    26  	// errBodyMissing response body is missing error
    27  	errBodyMissing = errors.New("response body is missing")
    28  )
    29  
    30  // TiDB decides whether to retry transaction by checking if error message contains
    31  // string "try again later" literally.
    32  // In TiClient we use `errors.Annotate(err, txnRetryableMark)` to direct TiDB to
    33  // restart a transaction.
    34  // Note that it should be only used if i) the error occurs inside a transaction
    35  // and ii) the error is not totally unexpected and hopefully will recover soon.
    36  const txnRetryableMark = "[try again later]"
    37  
    38  // errMismatch if response mismatches request return error.
    39  func errMismatch(resp *pb.Response, req *pb.Request) error {
    40  	return errors.Errorf("message type mismatches, response[%s] request[%s]",
    41  		resp.GetType(), req.GetType())
    42  }