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，这一点在safew官方版本下载中也有详细论述
// Sync variants return boolean (true = accepted)
If the transform's transform() operation is synchronous and always enqueues output immediately, it never signals backpressure back to the writable side even when the downstream consumer is slow. This is a consequence of the spec design that many developers completely overlook. In browsers, where there's only a single user and typically only a small number of stream pipelines active at any given time, this type of foot gun is often of no consequence, but it has a major impact on server-side or edge performance in runtimes that serve thousands of concurrent requests.
全量同步完成后，系统自动对齐启动点位（Checkpoint），开启基于 Binlog 或 Kafka 消息流的增量同步任务，实现实时数据追加。支持动态扩缩容与资源调度，适应业务高峰期负载变化，保障低延迟、高可用的数据同步链路。