Bugfix/harden activity timeout (#4545)

* add some hardening

* add info memory logging

* fix last_observed

* remove log spam

* properly cache last activity details

* default values

---------

Co-authored-by: Richard Kuo (Onyx) <rkuo@onyx.app>

backend/onyx/background/celery/apps/primary.py

@@ -108,14 +108,19 @@ def on_worker_init(sender: Worker, **kwargs: Any) -> None:
     r = get_redis_client(tenant_id=POSTGRES_DEFAULT_SCHEMA)
 
     # Log the role and slave count - being connected to a slave or slave count > 0 could be problematic
-    info: dict[str, Any] = cast(dict, r.info("replication"))
-    role: str = cast(str, info.get("role"))
-    connected_slaves: int = info.get("connected_slaves", 0)
+    replication_info: dict[str, Any] = cast(dict, r.info("replication"))
+    role: str = cast(str, replication_info.get("role", ""))
+    connected_slaves: int = replication_info.get("connected_slaves", 0)
 
     logger.info(
         f"Redis INFO REPLICATION: role={role} connected_slaves={connected_slaves}"
     )
 
+    memory_info: dict[str, Any] = cast(dict, r.info("memory"))
+    maxmemory_policy: str = cast(str, memory_info.get("maxmemory_policy", ""))
+
+    logger.info(f"Redis INFO MEMORY: maxmemory_policy={maxmemory_policy}")
+
     # For the moment, we're assuming that we are the only primary worker
     # that should be running.
     # TODO: maybe check for or clean up another zombie primary worker if we detect it

backend/onyx/background/celery/tasks/indexing/tasks.py

@@ -1061,6 +1061,10 @@ def connector_indexing_proxy_task(
     # Track the last time memory info was emitted
     last_memory_emit_time = 0.0
 
+    # track the last ttl and the time it was observed
+    last_activity_ttl_observed: float = time.monotonic()
+    last_activity_ttl: int = 0
+
     try:
         with get_session_with_current_tenant() as db_session:
             index_attempt = get_index_attempt(
@@ -1074,11 +1078,15 @@ def connector_indexing_proxy_task(
             )
 
         redis_connector_index.set_active()  # renew active signal
-        redis_connector_index.set_connector_active()  # prime the connective active signal
+
+        # prime the connector active signal (renewed inside the connector)
+        redis_connector_index.set_connector_active()
 
         while True:
             sleep(5)
 
+            now = time.monotonic()
+
             # renew watchdog signal (this has a shorter timeout than set_active)
             redis_connector_index.set_watchdog(True)
 
@@ -1128,18 +1136,37 @@ def connector_indexing_proxy_task(
                 break
 
             # if activity timeout is detected, break (exit point will clean up)
-            if not redis_connector_index.connector_active():
-                task_logger.warning(
-                    log_builder.build(
-                        "Indexing watchdog - activity timeout exceeded",
-                        timeout=f"{CELERY_INDEXING_WATCHDOG_CONNECTOR_TIMEOUT}s",
+            ttl = redis_connector_index.connector_active_ttl()
+            if ttl < 0:
+                # verify expectations around ttl
+                last_observed = last_activity_ttl_observed - now
+                if now > last_activity_ttl_observed + last_activity_ttl:
+                    task_logger.warning(
+                        log_builder.build(
+                            "Indexing watchdog - activity timeout exceeded",
+                            last_observed=f"{last_observed:.2f}s",
+                            last_ttl=f"{last_activity_ttl}",
+                            timeout=f"{CELERY_INDEXING_WATCHDOG_CONNECTOR_TIMEOUT}s",
+                        )
                     )
-                )
 
-                result.status = (
-                    IndexingWatchdogTerminalStatus.TERMINATED_BY_ACTIVITY_TIMEOUT
-                )
-                break
+                    result.status = (
+                        IndexingWatchdogTerminalStatus.TERMINATED_BY_ACTIVITY_TIMEOUT
+                    )
+                    break
+                else:
+                    task_logger.warning(
+                        log_builder.build(
+                            "Indexing watchdog - activity timeout expired unexpectedly, "
+                            "waiting for last observed TTL before exiting",
+                            last_observed=f"{last_observed:.2f}s",
+                            last_ttl=f"{last_activity_ttl}",
+                            timeout=f"{CELERY_INDEXING_WATCHDOG_CONNECTOR_TIMEOUT}s",
+                        )
+                    )
+            else:
+                last_activity_ttl_observed = now
+                last_activity_ttl = ttl
 
             # if the spawned task is still running, restart the check once again
             # if the index attempt is not in a finished status

backend/onyx/connectors/slack/connector.py

@@ -255,7 +255,6 @@ def default_msg_filter(message: MessageType) -> bool:
     # Don't keep messages from bots
     if message.get("bot_id") or message.get("app_id"):
         bot_profile_name = message.get("bot_profile", {}).get("name")
-        print(f"bot_profile_name: {bot_profile_name}")
         if bot_profile_name == "DanswerBot Testing":
             return False
         return True

backend/onyx/redis/redis_connector_index.py

@@ -165,6 +165,16 @@ class RedisConnectorIndex:
 
         return False
 
+    def connector_active_ttl(self) -> int:
+        """Refer to https://redis.io/docs/latest/commands/ttl/
+
+        -2 means the key does not exist
+        -1 means the key exists but has no associated expire
+        Otherwise, returns the actual TTL of the key
+        """
+        ttl = cast(int, self.redis.ttl(self.connector_active_key))
+        return ttl
+
     def generator_locked(self) -> bool:
         return bool(self.redis.exists(self.generator_lock_key))