{"Entry":{"collection":"waitevent","key":"client/LibpqwalreceiverReceive","name":"LibpqwalreceiverReceive","aliases":["LibPQWalReceiverReceive","LibpqwalreceiverReceive"],"metadata":{"aliases":["LibPQWalReceiverReceive","LibpqwalreceiverReceive"],"changed_in":["17"],"changes":[{"from":"9.6","moved":null,"renamed":null,"reworded":null,"status":"added","to":"10"},{"from":"16","moved":null,"renamed":{"from":"LibPQWalReceiverReceive","to":"LibpqwalreceiverReceive"},"reworded":null,"status":"changed","to":"17"}],"content_hash":"314b18e1c0c16fafae625b06dc5dccd5d77d4b7038a9484b32b6aa31b60773b9","dossier":{"actions":{"en":["Check state and transaction age before counting the wait as load.","Correlate with the owning application, pool, and network path.","Fix consumer backpressure or pool policy rather than repeatedly terminating connections."],"zh":["先看 state 与事务年龄，再决定它是否算负载。","关联负责的应用、连接池与网络路径。","修复消费者背压或连接池策略，不要反复终止连接。"]},"diagnostic_sql":[{"id":"sessions","min_version":"13","sql":"SELECT pid, backend_type, usename, datname, application_name,\n       state, now() - query_start AS query_age,\n       now() - xact_start AS xact_age,\n       wait_event_type, wait_event,\n       pg_blocking_pids(pid) AS blocking_pids,\n       left(query, 160) AS query\nFROM pg_stat_activity\nWHERE wait_event_type = 'Client'\n  AND wait_event = 'LibpqwalreceiverReceive'\nORDER BY query_age DESC NULLS LAST;","title":"Sessions waiting on Client/LibpqwalreceiverReceive","title_zh":"正在等待 Client/LibpqwalreceiverReceive 的会话"},{"id":"cohort","min_version":"13","sql":"SELECT wait_event, count(*) AS waiting_sessions,\n       count(*) FILTER (WHERE state = 'active') AS active_waiters,\n       max(now() - query_start) AS oldest_query\nFROM pg_stat_activity\nWHERE wait_event_type = 'Client'\nGROUP BY wait_event\nORDER BY waiting_sessions DESC, wait_event;","title":"Current Client cohort","title_zh":"当前 Client 等待分布"},{"id":"lock_objects","min_version":"13","sql":"SELECT a.pid, l.locktype, l.mode, l.granted, l.fastpath,\n       d.datname, n.nspname, c.relname,\n       l.page, l.tuple, l.virtualxid, l.transactionid,\n       l.classid, l.objid, l.objsubid\nFROM pg_stat_activity AS a\nLEFT JOIN pg_locks AS l ON l.pid = a.pid\nLEFT JOIN pg_database AS d ON d.oid = l.database\nLEFT JOIN pg_class AS c\n  ON c.oid = l.relation\n AND l.database = (\n       SELECT oid FROM pg_database WHERE datname = current_database()\n     )\nLEFT JOIN pg_namespace AS n ON n.oid = c.relnamespace\nWHERE a.wait_event_type = 'Client'\n  AND a.wait_event = 'LibpqwalreceiverReceive'\nORDER BY a.pid, l.granted, l.locktype, l.mode;","title":"Lock and relation context for these sessions","title_zh":"这些会话的锁与关系上下文"}],"emission":{"status":"active","verified_release":"18.6"},"gucs":["wal_buffers","synchronous_commit","max_connections","idle_in_transaction_session_timeout"],"incident_pattern":{"en":"","zh":""},"mechanism":{"en":"`WAIT_EVENT_LIBPQWALRECEIVER_RECEIVE` at `src/backend/replication/libpqwalreceiver/libpqwalreceiver.c:876` is the grep-verified reporting path. The public identity/resource is mapped at `src/backend/utils/activity/wait_event.c:283`. The instrumented operation is: Waiting in WAL receiver to receive data from remote server. The frontend protocol path reports LibpqwalreceiverReceive immediately before a socket, TLS/GSS, or replication-client operation blocks. PostgreSQL is waiting for the remote side or network to progress.","zh":"`WAIT_EVENT_LIBPQWALRECEIVER_RECEIVE` 位于 `src/backend/replication/libpqwalreceiver/libpqwalreceiver.c:876`，是经 grep 核验的报告路径。公共身份/资源映射位于 `src/backend/utils/activity/wait_event.c:283`。探针覆盖的操作是：在 WAL receiver 中等待从远程服务器接收数据。前端协议路径在套接字、TLS/GSS 或复制客户端操作即将阻塞前报告 LibpqwalreceiverReceive；PostgreSQL 正在等待远端或网络推进。"},"metrics":["waiting_sessions","wait_event_share","wal_bytes","wal_write_time","active_backends"],"normal":{"en":"Idle ClientRead sessions are normal connection-pool inventory.","zh":"空闲状态的 ClientRead 通常只是连接池存量。"},"official_descriptions":{"17":"Waiting in WAL receiver to receive data from remote server","18":"Waiting in WAL receiver to receive data from remote 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transaction、连接耗尽或复制客户端停滞时需要调查。"}},"first_version":"10","has_dossier":true,"imported_at":"2026-09-27T17:57:32.522808+08:00","key":"client/libpqwalreceiverreceive","last_version":"20","name":"LibpqwalreceiverReceive","position":29,"present_in":["10","11","12","13","14","15","16","17","18","19","20"],"slug":"libpqwalreceiver-receive","source_rev":"english-manuals:e404ebda5d416176d97589ae1374ab5be6663efa056387d5113bf60a21bbd0b7","summary":"Waiting in WAL receiver to receive data from remote server.","summary_zh":"","type":"Client","type_slug":"client","type_variants":["Client"]}},"Definition":{"Collection":"waitevent","Key":"client/LibpqwalreceiverReceive","SourceDatabase":"center","Version":"18","SourceTable":"waitevent","SourceKey":"client/libpqwalreceiverreceive","SourceRevision":"english-manuals:e404ebda5d416176d97589ae1374ab5be6663efa056387d5113bf60a21bbd0b7","Facts":{"description":"Waiting in WAL receiver to receive data from remote 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