// SplitQuery splits a query into sub queries by appending keyranges and
// primary key range clauses. Rows corresponding to the sub queries
// are guaranteed to be non-overlapping and will add up to the rows of
// original query. Number of sub queries will be a multiple of N that is
// greater than or equal to SplitQueryRequest.SplitCount, where N is the
// number of shards.
func (vtg *VTGate) SplitQuery(ctx context.Context, req *proto.SplitQueryRequest, reply *proto.SplitQueryResult) error {
sc := vtg.resolver.scatterConn
keyspace, srvKeyspace, shards, err := getKeyspaceShards(ctx, sc.toposerv, sc.cell, req.Keyspace, topo.TYPE_RDONLY)
if err != nil {
return err
}
perShardSplitCount := int(math.Ceil(float64(req.SplitCount) / float64(len(shards))))
if srvKeyspace.ShardingColumnName != "" {
// we are using range-based sharding, so the result
// will be a list of Splits with KeyRange clauses
keyRangeByShard := map[string]kproto.KeyRange{}
for _, shard := range shards {
keyRangeByShard[shard.Name] = shard.KeyRange
}
splits, err := vtg.resolver.scatterConn.SplitQueryKeyRange(ctx, req.Query, req.SplitColumn, perShardSplitCount, keyRangeByShard, keyspace)
if err != nil {
return err
}
reply.Splits = splits
return nil
}
// we are using custom sharding, so the result
// will be a list of Splits with Shard clauses
shardNames := make([]string, len(shards))
for i, shard := range shards {
shardNames[i] = shard.Name
}
splits, err := vtg.resolver.scatterConn.SplitQueryCustomSharding(ctx, req.Query, req.SplitColumn, perShardSplitCount, shardNames, keyspace)
if err != nil {
return err
}
reply.Splits = splits
return nil
}
// SplitQuery splits a query into sub queries by appending keyranges and
// primary key range clauses. Rows corresponding to the sub queries
// are guaranteed to be non-overlapping and will add up to the rows of
// original query. Number of sub queries will be a multiple of N that is
// greater than or equal to SplitQueryRequest.SplitCount, where N is the
// number of shards.
func (vtg *VTGate) SplitQuery(ctx context.Context, keyspace string, sql string, bindVariables map[string]interface{}, splitColumn string, splitCount int, reply *proto.SplitQueryResult) error {
keyspace, srvKeyspace, shards, err := getKeyspaceShards(ctx, vtg.resolver.toposerv, vtg.resolver.cell, keyspace, pb.TabletType_RDONLY)
if err != nil {
return err
}
perShardSplitCount := int(math.Ceil(float64(splitCount) / float64(len(shards))))
if srvKeyspace.ShardingColumnName != "" {
// we are using range-based sharding, so the result
// will be a list of Splits with KeyRange clauses
keyRangeByShard := make(map[string]*pb.KeyRange)
for _, shard := range shards {
keyRangeByShard[shard.Name] = shard.KeyRange
}
splits, err := vtg.resolver.scatterConn.SplitQueryKeyRange(ctx, sql, bindVariables, splitColumn, perShardSplitCount, keyRangeByShard, keyspace)
if err != nil {
return err
}
reply.Splits = splits
return nil
}
// we are using custom sharding, so the result
// will be a list of Splits with Shard clauses
shardNames := make([]string, len(shards))
for i, shard := range shards {
shardNames[i] = shard.Name
}
splits, err := vtg.resolver.scatterConn.SplitQueryCustomSharding(ctx, sql, bindVariables, splitColumn, perShardSplitCount, shardNames, keyspace)
if err != nil {
return err
}
reply.Splits = splits
return nil
}
func (c *echoClient) SplitQuery(ctx context.Context, keyspace string, sql string, bindVariables map[string]interface{}, splitColumn string, splitCount int, reply *proto.SplitQueryResult) error {
if strings.HasPrefix(sql, EchoPrefix) {
reply.Splits = append(reply.Splits, proto.SplitQueryPart{
Query: &proto.KeyRangeQuery{
Sql: fmt.Sprintf("%v:%v:%v", sql, splitColumn, splitCount),
BindVariables: bindVariables,
Keyspace: keyspace,
},
})
return nil
}
return c.fallback.SplitQuery(ctx, sql, keyspace, bindVariables, splitColumn, splitCount, reply)
}
// SplitQuery is the RPC version of vtgateservice.VTGateService method
func (vtg *VTGate) SplitQuery(ctx context.Context, request *proto.SplitQueryRequest, reply *proto.SplitQueryResult) (err error) {
defer vtg.server.HandlePanic(&err)
ctx, cancel := context.WithDeadline(ctx, time.Now().Add(*rpcTimeout))
defer cancel()
ctx = callerid.NewContext(ctx,
callerid.GoRPCEffectiveCallerID(request.CallerID),
callerid.NewImmediateCallerID("gorpc client"))
splits, vtgErr := vtg.server.SplitQuery(ctx,
request.Keyspace,
request.Query.Sql,
request.Query.BindVariables,
request.SplitColumn,
request.SplitCount)
reply.Splits = splits
vtgate.AddVtGateError(vtgErr, &reply.Err)
return nil
}
// SplitQuery splits a query into sub queries by appending keyranges and
// primary key range clauses. Rows corresponding to the sub queries
// are guaranteed to be non-overlapping and will add up to the rows of
// original query. Number of sub queries will be a multiple of N that is
// greater than or equal to SplitQueryRequest.SplitCount, where N is the
// number of shards.
func (vtg *VTGate) SplitQuery(context context.Context, req *proto.SplitQueryRequest, reply *proto.SplitQueryResult) (err error) {
defer handlePanic(&err)
sc := vtg.resolver.scatterConn
keyspace, shards, err := getKeyspaceShards(sc.toposerv, sc.cell, req.Keyspace, topo.TYPE_RDONLY)
if err != nil {
return err
}
keyRangeByShard := map[string]kproto.KeyRange{}
for _, shard := range shards {
keyRangeByShard[shard.ShardName()] = shard.KeyRange
}
perShardSplitCount := int(math.Ceil(float64(req.SplitCount) / float64(len(shards))))
splits, err := vtg.resolver.scatterConn.SplitQuery(context, req.Query, perShardSplitCount, keyRangeByShard, keyspace)
if err != nil {
return err
}
reply.Splits = splits
return nil
}
// AddVtGateErrorToSplitQueryResult will mutate a SplitQueryResult struct to fill in the Err
// field with details from the VTGate error.
func AddVtGateErrorToSplitQueryResult(err error, reply *proto.SplitQueryResult) {
if err == nil {
return
}
reply.Err = rpcErrFromVtGateError(err)
}
