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Native CLI i18n: The TrustGraph CLI has built-in translation support that dynamically loads language strings. You can test and use different languages by simply passing the --lang flag (e.g., --lang es for Spanish, --lang ru for Russian) or by configuring your environment's LANG variable. Automated Docs Translations: This PR introduces autonomously translated Markdown documentation into several target languages, including Spanish, Swahili, Portuguese, Turkish, Hindi, Hebrew, Arabic, Simplified Chinese, and Russian.
725 lines
25 KiB
Markdown
725 lines
25 KiB
Markdown
---
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layout: default
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title: "导入/导出 优雅关闭 技术规范"
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parent: "Chinese (Beta)"
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---
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# 导入/导出 优雅关闭 技术规范
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> **Beta Translation:** This document was translated via Machine Learning and as such may not be 100% accurate. All non-English languages are currently classified as Beta.
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## 问题陈述
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<<<<<<< HEAD
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TrustGraph 网关在导入和导出操作中，在 WebSocket 连接关闭时，目前存在消息丢失的问题。 这是由于存在竞争条件，导致正在传输的消息在到达目的地之前被丢弃（对于导入，是丢弃到 Pulsar 队列的消息；对于导出，是丢弃到 WebSocket 客户端的消息）。
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### 导入端问题
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1. 发布者的 asyncio.Queue 缓冲区在关闭时未被清空
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2. 在确保所有排队的消息到达 Pulsar 之前，WebSocket 连接关闭
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=======
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TrustGraph 网关在导入和导出操作的 WebSocket 关闭过程中，目前存在消息丢失的问题。 这是由于存在竞争条件，导致正在传输的消息在到达目的地之前被丢弃（对于导入，是丢弃到 Pulsar 队列的消息；对于导出，是丢弃到 WebSocket 客户端的消息）。
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### 导入端问题
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1. 发布者的 asyncio.Queue 缓冲区在关闭时未被清空
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2. 在确保所有排队的消息到达 Pulsar 之前，WebSocket 被关闭
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>>>>>>> 82edf2d (New md files from RunPod)
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3. 没有用于确认消息成功传递的机制
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### 导出端问题
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1. 消息在成功传递到客户端之前，已在 Pulsar 中得到确认
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2. 预定义的超时时间会导致队列已满时消息丢失
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3. 没有用于处理慢速消费者的反压机制
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4. 存在多个缓冲区，数据可能在此处丢失
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## 架构概述
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```
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Import Flow:
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Client -> Websocket -> TriplesImport -> Publisher -> Pulsar Queue
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Export Flow:
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Pulsar Queue -> Subscriber -> TriplesExport -> Websocket -> Client
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```
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## 建议的修复方案
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### 1. 发布者改进（导入端）
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#### A. 优雅的队列清空
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**文件**: `trustgraph-base/trustgraph/base/publisher.py`
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```python
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class Publisher:
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def __init__(self, client, topic, schema=None, max_size=10,
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chunking_enabled=True, drain_timeout=5.0):
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self.client = client
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self.topic = topic
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self.schema = schema
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self.q = asyncio.Queue(maxsize=max_size)
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self.chunking_enabled = chunking_enabled
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self.running = True
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self.draining = False # New state for graceful shutdown
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self.task = None
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self.drain_timeout = drain_timeout
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async def stop(self):
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"""Initiate graceful shutdown with draining"""
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self.running = False
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self.draining = True
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if self.task:
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# Wait for run() to complete draining
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await self.task
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async def run(self):
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"""Enhanced run method with integrated draining logic"""
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while self.running or self.draining:
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try:
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producer = self.client.create_producer(
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topic=self.topic,
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schema=JsonSchema(self.schema),
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chunking_enabled=self.chunking_enabled,
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)
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drain_end_time = None
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while self.running or self.draining:
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try:
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# Start drain timeout when entering drain mode
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if self.draining and drain_end_time is None:
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drain_end_time = time.time() + self.drain_timeout
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logger.info(f"Publisher entering drain mode, timeout={self.drain_timeout}s")
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# Check drain timeout
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if self.draining and time.time() > drain_end_time:
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if not self.q.empty():
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logger.warning(f"Drain timeout reached with {self.q.qsize()} messages remaining")
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self.draining = False
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break
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# Calculate wait timeout based on mode
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if self.draining:
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# Shorter timeout during draining to exit quickly when empty
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timeout = min(0.1, drain_end_time - time.time())
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else:
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# Normal operation timeout
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timeout = 0.25
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# Get message from queue
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id, item = await asyncio.wait_for(
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self.q.get(),
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timeout=timeout
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)
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# Send the message (single place for sending)
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if id:
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producer.send(item, { "id": id })
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else:
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producer.send(item)
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except asyncio.TimeoutError:
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# If draining and queue is empty, we're done
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if self.draining and self.q.empty():
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logger.info("Publisher queue drained successfully")
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self.draining = False
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break
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continue
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except asyncio.QueueEmpty:
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# If draining and queue is empty, we're done
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if self.draining and self.q.empty():
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logger.info("Publisher queue drained successfully")
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self.draining = False
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break
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continue
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# Flush producer before closing
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if producer:
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producer.flush()
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producer.close()
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except Exception as e:
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logger.error(f"Exception in publisher: {e}", exc_info=True)
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if not self.running and not self.draining:
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return
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# If handler drops out, sleep a retry
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await asyncio.sleep(1)
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async def send(self, id, item):
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"""Send still works normally - just adds to queue"""
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if self.draining:
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# Optionally reject new messages during drain
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raise RuntimeError("Publisher is shutting down, not accepting new messages")
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await self.q.put((id, item))
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```
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**主要设计优势：**
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**单一发送位置：** 所有 `producer.send()` 调用都发生在 `run()` 方法内的单一位置。
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**清晰的状态机：** 三个明确的状态 - 运行中、正在排空、已停止。
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**超时保护：** 在排空过程中不会无限期挂起。
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**更好的可观察性：** 清晰地记录排空进度和状态转换。
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**可选的消息拒绝：** 可以在关闭阶段拒绝新的消息。
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#### B. 改进的关闭顺序
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**文件：** `trustgraph-flow/trustgraph/gateway/dispatch/triples_import.py`
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```python
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class TriplesImport:
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async def destroy(self):
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"""Enhanced destroy with proper shutdown order"""
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# Step 1: Stop accepting new messages
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self.running.stop()
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# Step 2: Wait for publisher to drain its queue
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logger.info("Draining publisher queue...")
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await self.publisher.stop()
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# Step 3: Close websocket only after queue is drained
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if self.ws:
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await self.ws.close()
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```
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### 2. 订阅者改进（导出端）
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#### A. 集成排空模式
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**文件**: `trustgraph-base/trustgraph/base/subscriber.py`
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```python
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class Subscriber:
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def __init__(self, client, topic, subscription, consumer_name,
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schema=None, max_size=100, metrics=None,
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backpressure_strategy="block", drain_timeout=5.0):
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# ... existing init ...
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self.backpressure_strategy = backpressure_strategy
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self.running = True
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self.draining = False # New state for graceful shutdown
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self.drain_timeout = drain_timeout
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self.pending_acks = {} # Track messages awaiting delivery
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async def stop(self):
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"""Initiate graceful shutdown with draining"""
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self.running = False
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self.draining = True
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if self.task:
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# Wait for run() to complete draining
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await self.task
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async def run(self):
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"""Enhanced run method with integrated draining logic"""
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while self.running or self.draining:
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if self.metrics:
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self.metrics.state("stopped")
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try:
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self.consumer = self.client.subscribe(
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topic = self.topic,
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subscription_name = self.subscription,
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consumer_name = self.consumer_name,
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schema = JsonSchema(self.schema),
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)
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if self.metrics:
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self.metrics.state("running")
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logger.info("Subscriber running...")
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drain_end_time = None
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while self.running or self.draining:
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# Start drain timeout when entering drain mode
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if self.draining and drain_end_time is None:
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drain_end_time = time.time() + self.drain_timeout
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logger.info(f"Subscriber entering drain mode, timeout={self.drain_timeout}s")
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# Stop accepting new messages from Pulsar during drain
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self.consumer.pause_message_listener()
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# Check drain timeout
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if self.draining and time.time() > drain_end_time:
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async with self.lock:
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total_pending = sum(
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q.qsize() for q in
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list(self.q.values()) + list(self.full.values())
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)
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if total_pending > 0:
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logger.warning(f"Drain timeout reached with {total_pending} messages in queues")
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self.draining = False
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break
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# Check if we can exit drain mode
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if self.draining:
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async with self.lock:
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all_empty = all(
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q.empty() for q in
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list(self.q.values()) + list(self.full.values())
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)
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if all_empty and len(self.pending_acks) == 0:
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logger.info("Subscriber queues drained successfully")
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self.draining = False
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break
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# Process messages only if not draining
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if not self.draining:
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try:
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msg = await asyncio.to_thread(
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self.consumer.receive,
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timeout_millis=250
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)
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except _pulsar.Timeout:
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continue
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except Exception as e:
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logger.error(f"Exception in subscriber receive: {e}", exc_info=True)
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raise e
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if self.metrics:
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self.metrics.received()
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# Process the message
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await self._process_message(msg)
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else:
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# During draining, just wait for queues to empty
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await asyncio.sleep(0.1)
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except Exception as e:
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logger.error(f"Subscriber exception: {e}", exc_info=True)
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finally:
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# Negative acknowledge any pending messages
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for msg in self.pending_acks.values():
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self.consumer.negative_acknowledge(msg)
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self.pending_acks.clear()
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if self.consumer:
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self.consumer.unsubscribe()
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self.consumer.close()
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self.consumer = None
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if self.metrics:
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self.metrics.state("stopped")
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if not self.running and not self.draining:
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return
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# If handler drops out, sleep a retry
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await asyncio.sleep(1)
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async def _process_message(self, msg):
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"""Process a single message with deferred acknowledgment"""
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# Store message for later acknowledgment
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msg_id = str(uuid.uuid4())
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self.pending_acks[msg_id] = msg
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try:
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id = msg.properties()["id"]
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except:
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id = None
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value = msg.value()
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delivery_success = False
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async with self.lock:
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# Deliver to specific subscribers
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if id in self.q:
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delivery_success = await self._deliver_to_queue(
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self.q[id], value
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)
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# Deliver to all subscribers
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for q in self.full.values():
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if await self._deliver_to_queue(q, value):
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delivery_success = True
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# Acknowledge only on successful delivery
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if delivery_success:
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self.consumer.acknowledge(msg)
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del self.pending_acks[msg_id]
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else:
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# Negative acknowledge for retry
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self.consumer.negative_acknowledge(msg)
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del self.pending_acks[msg_id]
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async def _deliver_to_queue(self, queue, value):
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"""Deliver message to queue with backpressure handling"""
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try:
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if self.backpressure_strategy == "block":
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# Block until space available (no timeout)
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await queue.put(value)
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return True
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elif self.backpressure_strategy == "drop_oldest":
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# Drop oldest message if queue full
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if queue.full():
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try:
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queue.get_nowait()
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if self.metrics:
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self.metrics.dropped()
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except asyncio.QueueEmpty:
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pass
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await queue.put(value)
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return True
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elif self.backpressure_strategy == "drop_new":
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# Drop new message if queue full
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if queue.full():
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if self.metrics:
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self.metrics.dropped()
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return False
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await queue.put(value)
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return True
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except Exception as e:
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logger.error(f"Failed to deliver message: {e}")
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return False
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```
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**主要设计优势（与发布者模式匹配）：**
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<<<<<<< HEAD
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**单一处理位置：** 所有消息处理都在 `run()` 方法中进行。
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=======
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**单一处理位置：** 所有消息处理都发生在 `run()` 方法中。
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>>>>>>> 82edf2d (New md files from RunPod)
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**清晰的状态机：** 三个明确的状态 - 运行中、正在排空、已停止。
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**排空期间暂停：** 在排空现有队列时，停止从 Pulsar 接收新消息。
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**超时保护：** 在排空过程中不会无限期挂起。
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**正确的清理：** 在关闭时，会对任何未发送的消息进行否定确认。
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#### B. 导出处理程序改进
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**文件：** `trustgraph-flow/trustgraph/gateway/dispatch/triples_export.py`
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```python
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class TriplesExport:
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async def destroy(self):
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"""Enhanced destroy with graceful shutdown"""
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# Step 1: Signal stop to prevent new messages
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self.running.stop()
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# Step 2: Wait briefly for in-flight messages
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await asyncio.sleep(0.5)
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# Step 3: Unsubscribe and stop subscriber (triggers queue drain)
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if hasattr(self, 'subs'):
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await self.subs.unsubscribe_all(self.id)
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await self.subs.stop()
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# Step 4: Close websocket last
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if self.ws and not self.ws.closed:
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await self.ws.close()
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async def run(self):
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"""Enhanced run with better error handling"""
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self.subs = Subscriber(
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client = self.pulsar_client,
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topic = self.queue,
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consumer_name = self.consumer,
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subscription = self.subscriber,
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schema = Triples,
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backpressure_strategy = "block" # Configurable
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)
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await self.subs.start()
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self.id = str(uuid.uuid4())
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q = await self.subs.subscribe_all(self.id)
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consecutive_errors = 0
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max_consecutive_errors = 5
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while self.running.get():
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try:
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resp = await asyncio.wait_for(q.get(), timeout=0.5)
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await self.ws.send_json(serialize_triples(resp))
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consecutive_errors = 0 # Reset on success
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except asyncio.TimeoutError:
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continue
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except queue.Empty:
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continue
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except Exception as e:
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logger.error(f"Exception sending to websocket: {str(e)}")
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consecutive_errors += 1
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if consecutive_errors >= max_consecutive_errors:
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logger.error("Too many consecutive errors, shutting down")
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break
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# Brief pause before retry
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await asyncio.sleep(0.1)
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# Graceful cleanup handled in destroy()
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```
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### 3. Socket 级别改进
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**文件**: `trustgraph-flow/trustgraph/gateway/endpoint/socket.py`
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```python
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class SocketEndpoint:
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async def listener(self, ws, dispatcher, running):
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"""Enhanced listener with graceful shutdown"""
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async for msg in ws:
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if msg.type == WSMsgType.TEXT:
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await dispatcher.receive(msg)
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continue
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elif msg.type == WSMsgType.BINARY:
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await dispatcher.receive(msg)
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continue
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else:
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# Graceful shutdown on close
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logger.info("Websocket closing, initiating graceful shutdown")
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running.stop()
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# Allow time for dispatcher cleanup
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await asyncio.sleep(1.0)
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break
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async def handle(self, request):
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"""Enhanced handler with better cleanup"""
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# ... existing setup code ...
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try:
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async with asyncio.TaskGroup() as tg:
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running = Running()
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dispatcher = await self.dispatcher(
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ws, running, request.match_info
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)
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worker_task = tg.create_task(
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self.worker(ws, dispatcher, running)
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)
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lsnr_task = tg.create_task(
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self.listener(ws, dispatcher, running)
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)
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except ExceptionGroup as e:
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logger.error("Exception group occurred:", exc_info=True)
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# Attempt graceful dispatcher shutdown
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try:
|
||
await asyncio.wait_for(
|
||
dispatcher.destroy(),
|
||
timeout=5.0
|
||
)
|
||
except asyncio.TimeoutError:
|
||
logger.warning("Dispatcher shutdown timed out")
|
||
except Exception as de:
|
||
logger.error(f"Error during dispatcher cleanup: {de}")
|
||
|
||
except Exception as e:
|
||
logger.error(f"Socket exception: {e}", exc_info=True)
|
||
|
||
finally:
|
||
# Ensure dispatcher cleanup
|
||
if dispatcher and hasattr(dispatcher, 'destroy'):
|
||
try:
|
||
await dispatcher.destroy()
|
||
except:
|
||
pass
|
||
|
||
# Ensure websocket is closed
|
||
if ws and not ws.closed:
|
||
await ws.close()
|
||
|
||
return ws
|
||
```
|
||
|
||
## 配置选项
|
||
|
||
添加配置支持，用于调整行为：
|
||
|
||
```python
|
||
# config.py
|
||
class GracefulShutdownConfig:
|
||
# Publisher settings
|
||
PUBLISHER_DRAIN_TIMEOUT = 5.0 # Seconds to wait for queue drain
|
||
PUBLISHER_FLUSH_TIMEOUT = 2.0 # Producer flush timeout
|
||
|
||
# Subscriber settings
|
||
SUBSCRIBER_DRAIN_TIMEOUT = 5.0 # Seconds to wait for queue drain
|
||
BACKPRESSURE_STRATEGY = "block" # Options: "block", "drop_oldest", "drop_new"
|
||
SUBSCRIBER_MAX_QUEUE_SIZE = 100 # Maximum queue size before backpressure
|
||
|
||
# Socket settings
|
||
SHUTDOWN_GRACE_PERIOD = 1.0 # Seconds to wait for graceful shutdown
|
||
MAX_CONSECUTIVE_ERRORS = 5 # Maximum errors before forced shutdown
|
||
|
||
# Monitoring
|
||
LOG_QUEUE_STATS = True # Log queue statistics on shutdown
|
||
METRICS_ENABLED = True # Enable metrics collection
|
||
```
|
||
|
||
## 测试策略
|
||
|
||
### 单元测试
|
||
|
||
```python
|
||
async def test_publisher_queue_drain():
|
||
"""Verify Publisher drains queue on shutdown"""
|
||
publisher = Publisher(...)
|
||
|
||
# Fill queue with messages
|
||
for i in range(10):
|
||
await publisher.send(f"id-{i}", {"data": i})
|
||
|
||
# Stop publisher
|
||
await publisher.stop()
|
||
|
||
# Verify all messages were sent
|
||
assert publisher.q.empty()
|
||
assert mock_producer.send.call_count == 10
|
||
|
||
async def test_subscriber_deferred_ack():
|
||
"""Verify Subscriber only acks on successful delivery"""
|
||
subscriber = Subscriber(..., backpressure_strategy="drop_new")
|
||
|
||
# Fill queue to capacity
|
||
queue = await subscriber.subscribe("test")
|
||
for i in range(100):
|
||
await queue.put({"data": i})
|
||
|
||
# Try to add message when full
|
||
msg = create_mock_message()
|
||
await subscriber._process_message(msg)
|
||
|
||
# Verify negative acknowledgment
|
||
assert msg.negative_acknowledge.called
|
||
assert not msg.acknowledge.called
|
||
```
|
||
|
||
### 集成测试
|
||
|
||
```python
|
||
async def test_import_graceful_shutdown():
|
||
"""Test import path handles shutdown gracefully"""
|
||
# Setup
|
||
import_handler = TriplesImport(...)
|
||
await import_handler.start()
|
||
|
||
# Send messages
|
||
messages = []
|
||
for i in range(100):
|
||
msg = {"metadata": {...}, "triples": [...]}
|
||
await import_handler.receive(msg)
|
||
messages.append(msg)
|
||
|
||
# Shutdown while messages in flight
|
||
await import_handler.destroy()
|
||
|
||
# Verify all messages reached Pulsar
|
||
received = await pulsar_consumer.receive_all()
|
||
assert len(received) == 100
|
||
|
||
async def test_export_no_message_loss():
|
||
"""Test export path doesn't lose acknowledged messages"""
|
||
# Setup Pulsar with test messages
|
||
for i in range(100):
|
||
await pulsar_producer.send({"data": i})
|
||
|
||
# Start export handler
|
||
export_handler = TriplesExport(...)
|
||
export_task = asyncio.create_task(export_handler.run())
|
||
|
||
# Receive some messages
|
||
received = []
|
||
for _ in range(50):
|
||
msg = await websocket.receive()
|
||
received.append(msg)
|
||
|
||
# Force shutdown
|
||
await export_handler.destroy()
|
||
|
||
# Continue receiving until websocket closes
|
||
while not websocket.closed:
|
||
try:
|
||
msg = await websocket.receive()
|
||
received.append(msg)
|
||
except:
|
||
break
|
||
|
||
# Verify no acknowledged messages were lost
|
||
assert len(received) >= 50
|
||
```
|
||
|
||
## 部署计划
|
||
|
||
<<<<<<< HEAD
|
||
### 第一阶段：关键修复（第一周）
|
||
修复订阅者确认时序问题（防止消息丢失）
|
||
添加发布者队列排空功能
|
||
部署到测试环境
|
||
|
||
### 第二阶段：平滑关闭（第二周）
|
||
=======
|
||
### 第一阶段：关键修复 (第一周)
|
||
修复订阅者确认时序问题 (防止消息丢失)
|
||
添加发布者队列排空功能
|
||
部署到测试环境
|
||
|
||
### 第二阶段：平滑关闭 (第二周)
|
||
>>>>>>> 82edf2d (New md files from RunPod)
|
||
实施关闭协调
|
||
添加反压策略
|
||
性能测试
|
||
|
||
<<<<<<< HEAD
|
||
### 第三阶段：监控与调优（第三周）
|
||
=======
|
||
### 第三阶段：监控与调优 (第三周)
|
||
>>>>>>> 82edf2d (New md files from RunPod)
|
||
添加队列深度的指标
|
||
添加消息丢失的告警
|
||
根据生产数据调整超时值
|
||
|
||
## 监控与告警
|
||
|
||
### 跟踪指标
|
||
`publisher.queue.depth` - 当前发布者队列大小
|
||
`publisher.messages.dropped` - 关闭期间丢失的消息数量
|
||
`subscriber.messages.negatively_acknowledged` - 失败的交付
|
||
`websocket.graceful_shutdowns` - 成功的平滑关闭
|
||
`websocket.forced_shutdowns` - 强制/超时关闭
|
||
|
||
### 告警
|
||
<<<<<<< HEAD
|
||
发布者队列深度超过 80% 的容量
|
||
=======
|
||
发布者队列深度超过 80% 容量
|
||
>>>>>>> 82edf2d (New md files from RunPod)
|
||
关闭期间出现任何消息丢失
|
||
订阅者否定确认率 > 1%
|
||
关闭超时
|
||
|
||
## 向后兼容性
|
||
|
||
所有更改都保持向后兼容性：
|
||
在没有配置的情况下，默认行为保持不变
|
||
现有部署继续正常运行
|
||
如果新的功能不可用，则会进行优雅降级
|
||
|
||
## 安全注意事项
|
||
|
||
没有引入新的攻击向量
|
||
反压可防止内存耗尽攻击
|
||
可配置的限制可防止资源滥用
|
||
|
||
## 性能影响
|
||
|
||
正常运行期间的开销很小
|
||
<<<<<<< HEAD
|
||
关闭可能需要长达 5 秒（可配置）
|
||
内存使用量受队列大小限制
|
||
CPU 影响可以忽略不计（<1% 的增加）
|
||
=======
|
||
关闭可能需要长达 5 秒钟 (可配置)
|
||
内存使用量受队列大小限制
|
||
CPU 影响可以忽略不计 (<1% 的增长)
|
||
>>>>>>> 82edf2d (New md files from RunPod)
|