t8y2/dbx · error

open %s session %d: %w

Error message

open %s session %d: %w

What it means

Panics in the kingbase bench harness when opening session N for one of the benchmark agents fails after the agent process started — connection params (host/port/database/username/password) were rejected. The wrapped error identifies the agent and session; the bench aborts because a session is essential to the comparison.

Source

Thrown at agents/drivers/kingbase-go/bench/agent_compare.go:111

		{name: "go-gokb", argv: []string{requiredEnv("GO_AGENT")}},
		{name: "jdbc", argv: jdbcAgentCommand(requiredEnv("JDBC_AGENT_JAR"))},
	}
	encoder := json.NewEncoder(os.Stdout)
	running := make([]*runningAgent, 0, len(agents))
	for _, candidate := range agents {
		process, startup, err := startAgent(candidate.argv)
		if err != nil {
			panic(fmt.Errorf("start %s: %w", candidate.name, err))
		}
		params := map[string]any{"host": host, "port": port, "database": database, "username": username, "password": password}
		readyRSS := readRSSKB(process.command.Process.Pid)
		var oneSessionRSS int64
		openStart := time.Now()
		for index := 0; index < maxConcurrency; index++ {
			request := cloneMap(params)
			request["agentSessionId"] = sessionID(index)
			if _, err := process.call("open_session", request); err != nil {
				panic(fmt.Errorf("open %s session %d: %w", candidate.name, index, err))
			}
			if index == 0 {
				oneSessionRSS = readRSSKB(process.command.Process.Pid)
			}
		}
		openDuration := time.Since(openStart)
		running = append(running, &runningAgent{
			name: candidate.name, process: process, startup: startup, openSessions: openDuration,
			readyRSSKB: readyRSS, oneSessionRSSKB: oneSessionRSS, sessionsRSSKB: readRSSKB(process.command.Process.Pid),
		})
	}
	defer func() {
		for _, candidate := range running {
			_ = candidate.process.close()
		}
	}()
	for _, concurrency := range concurrencies {
		if concurrency > maxConcurrency {

View on GitHub (pinned to c0390bff16)

Solutions

1. Verify BENCH connection environment variables (host, port, database, credentials) are correct
2. Confirm the database server accepts connections from the bench host
3. Check the wrapped error for the agent-specific rejection reason

When it happens

Trigger: Thrown at agents/drivers/kingbase-go/bench/agent_compare.go:111 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of t8y2/dbx@c0390bff16 (2026-09-05). Data as JSON: /api/errors/0633ba218cbdee71. Report an issue: GitHub.