@Override
    public void describe(Printer out) {
        this.readLock.lock();
        try {
            if (opened) {
                out.println(String.format("Database is opened. the path: %s", this.homePath));
                StatsConfig statsConfig = new StatsConfig();
                EnvironmentStats stats = environment.getStats(statsConfig);
                out.println(stats);
            } else {
                out.println(String.format("Database not open. the path: %s", this.homePath));
            }
        } finally {
            this.readLock.unlock();
        }
    }
First log index and last log index key in configuration column family.
jraft-extension/bdb-log-storage-impl/src/main/java/com/alipay/sofa/jraft/storage/impl/BDBLogStorage.java