{"record":{"id":"19c40142c2b8eef0","repo":"googleapis/mcp-toolbox","slug":"unable-to-create-pool-w-19c401","errorCode":null,"errorMessage":"unable to create pool: %w","messagePattern":"unable to create pool: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/sources/tidb/tidb.go","lineNumber":74,"sourceCode":"type Config struct {\n\tName     string `yaml:\"name\" validate:\"required\"`\n\tType     string `yaml:\"type\" validate:\"required\"`\n\tHost     string `yaml:\"host\" validate:\"required\"`\n\tPort     string `yaml:\"port\" validate:\"required\"`\n\tUser     string `yaml:\"user\" validate:\"required\"`\n\tPassword string `yaml:\"password\" validate:\"required\"`\n\tDatabase string `yaml:\"database\" validate:\"required\"`\n\tUseSSL   bool   `yaml:\"ssl\"`\n}\n\nfunc (r Config) SourceConfigType() string {\n\treturn SourceType\n}\n\nfunc (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {\n\tpool, err := initTiDBConnectionPool(ctx, tracer, r.Name, r.Host, r.Port, r.User, r.Password, r.Database, r.UseSSL)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"unable to create pool: %w\", err)\n\t}\n\n\terr = pool.PingContext(ctx)\n\tif err != nil {\n\t\tpool.Close()\n\t\treturn nil, fmt.Errorf(\"unable to connect successfully: %w\", err)\n\t}\n\n\ts := &Source{\n\t\tConfig: r,\n\t\tPool:   pool,\n\t}\n\treturn s, nil\n}\n\nvar _ sources.Source = &Source{}\n\ntype Source struct {","sourceCodeStart":56,"sourceCodeEnd":92,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/sources/tidb/tidb.go#L56-L92","documentation":"The TiDB (MySQL) connection pool could not be created during source Initialize — the DSN from host/port/user/password/database was rejected or the server was unreachable.","triggerScenarios":"Thrown at internal/sources/tidb/tidb.go:74 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Verify host, port, credentials and database in the source config","Confirm TiDB is reachable and the `ssl` setting matches the server's TLS requirement","Check firewall/VPC rules"],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"8cc6e09de2ad7b8bffc77751799585a1401a48eb","analyzedAt":"2026-09-05T01:10:36.887Z","contentChangedAt":"2026-09-05T01:10:36.887Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}