mirror of https://github.com/postgres/postgres
pgstat: add WAL receiver status view & SRF
This new view provides insight into the state of a running WAL receiver in a HOT standby node. The information returned includes the PID of the WAL receiver process, its status (stopped, starting, streaming, etc), start LSN and TLI, last received LSN and TLI, timestamp of last message send and receipt, latest end-of-WAL LSN and time, and the name of the slot (if any). Access to the detailed data is only granted to superusers; others only get the PID. Author: Michael Paquier Reviewer: Haribabu Kommi
This commit is contained in:
Alvaro Herrera
parent
6b1a837f69
commit
b1a9bad9e7
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@ -300,6 +300,14 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</entry>
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</row>
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<row>
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<entry><structname>pg_stat_wal_receiver</><indexterm><primary>pg_stat_wal_receiver</primary></indexterm></entry>
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<entry>Only one row, showing statistics about the WAL receiver from
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that receiver's connected server.
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See <xref linkend="pg-stat-wal-receiver-view"> for details.
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</entry>
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</row>
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<row>
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<entry><structname>pg_stat_ssl</><indexterm><primary>pg_stat_ssl</primary></indexterm></entry>
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<entry>One row per connection (regular and replication), showing information about
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@ -833,6 +841,89 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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listed; no information is available about downstream standby servers.
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</para>
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<table id="pg-stat-wal-receiver-view" xreflabel="pg_stat_wal_receiver">
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<title><structname>pg_stat_wal_receiver</structname> View</title>
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<tgroup cols="3">
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<thead>
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<row>
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<entry>Column</entry>
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<entry>Type</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>pid</></entry>
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<entry><type>integer</></entry>
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<entry>Process ID of the WAL receiver process</entry>
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</row>
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<row>
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<entry><structfield>status</></entry>
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<entry><type>text</></entry>
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<entry>Activity status of the WAL receiver process</entry>
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</row>
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<row>
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<entry><structfield>receive_start_lsn</></entry>
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<entry><type>pg_lsn</></entry>
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<entry>First transaction log position used when WAL receiver is
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started</entry>
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</row>
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<row>
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<entry><structfield>receive_start_tli</></entry>
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<entry><type>integer</></entry>
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<entry>First timeline number used when WAL receiver is started</entry>
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</row>
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<row>
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<entry><structfield>received_lsn</></entry>
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<entry><type>pg_lsn</></entry>
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<entry>Last transaction log position already received and flushed to
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disk, the initial value of this field being the first log position used
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when WAL receiver is started</entry>
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</row>
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<row>
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<entry><structfield>received_tli</></entry>
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<entry><type>integer</></entry>
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<entry>Timeline number of last transaction log position received and
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flushed to disk, the initial value of this field being the timeline
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number of the first log position used when WAL receiver is started
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</entry>
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</row>
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<row>
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<entry><structfield>last_msg_send_time</></entry>
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<entry><type>timestamp with time zone</></entry>
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<entry>Send time of last message received from origin WAL sender</entry>
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</row>
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<row>
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<entry><structfield>last_msg_receipt_time</></entry>
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<entry><type>timestamp with time zone</></entry>
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<entry>Receipt time of last message received from origin WAL sender</entry>
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</row>
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<row>
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<entry><structfield>latest_end_lsn</></entry>
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<entry><type>pg_lsn</></entry>
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<entry>Last transaction log position reported to origin WAL sender</entry>
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</row>
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<row>
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<entry><structfield>latest_end_time</></entry>
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<entry><type>timestamp with time zone</></entry>
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<entry>Time of last transaction log position reported to origin WAL sender</entry>
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</row>
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<row>
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<entry><structfield>slot_name</></entry>
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<entry><type>text</></entry>
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<entry>Replication slot name used by this WAL receiver</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>
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The <structname>pg_stat_wal_receiver</structname> view will contain only
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one row, showing statistics about the WAL receiver from that receiver's
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connected server.
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</para>
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<table id="pg-stat-ssl-view" xreflabel="pg_stat_ssl">
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<title><structname>pg_stat_ssl</structname> View</title>
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<tgroup cols="3">
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@ -662,6 +662,22 @@ CREATE VIEW pg_stat_replication AS
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WHERE S.usesysid = U.oid AND
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S.pid = W.pid;
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CREATE VIEW pg_stat_wal_receiver AS
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SELECT
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s.pid,
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s.status,
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s.receive_start_lsn,
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s.receive_start_tli,
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s.received_lsn,
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s.received_tli,
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s.last_msg_send_time,
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s.last_msg_receipt_time,
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s.latest_end_lsn,
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s.latest_end_time,
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s.slot_name
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FROM pg_stat_get_wal_receiver() s
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WHERE s.pid IS NOT NULL;
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CREATE VIEW pg_stat_ssl AS
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SELECT
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S.pid,
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@ -46,9 +46,12 @@
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#include <signal.h>
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#include <unistd.h>
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#include "access/htup_details.h"
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#include "access/timeline.h"
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#include "access/transam.h"
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#include "access/xlog_internal.h"
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#include "catalog/pg_type.h"
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#include "funcapi.h"
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#include "libpq/pqformat.h"
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#include "libpq/pqsignal.h"
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#include "miscadmin.h"
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@ -57,7 +60,9 @@
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#include "storage/ipc.h"
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#include "storage/pmsignal.h"
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#include "storage/procarray.h"
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#include "utils/builtins.h"
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#include "utils/guc.h"
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#include "utils/pg_lsn.h"
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#include "utils/ps_status.h"
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#include "utils/resowner.h"
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#include "utils/timestamp.h"
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@ -1215,3 +1220,152 @@ ProcessWalSndrMessage(XLogRecPtr walEnd, TimestampTz sendTime)
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pfree(receipttime);
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}
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}
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/*
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* Return a string constant representing the state. This is used
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* in system functions and views, and should *not* be translated.
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*/
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static const char *
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WalRcvGetStateString(WalRcvState state)
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{
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switch (state)
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{
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case WALRCV_STOPPED:
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return "stopped";
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case WALRCV_STARTING:
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return "starting";
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case WALRCV_STREAMING:
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return "streaming";
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case WALRCV_WAITING:
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return "waiting";
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case WALRCV_RESTARTING:
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return "restarting";
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case WALRCV_STOPPING:
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return "stopping";
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}
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return "UNKNOWN";
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}
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/*
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* Returns activity of WAL receiver, including pid, state and xlog locations
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* received from the WAL sender of another server.
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*/
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Datum
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pg_stat_get_wal_receiver(PG_FUNCTION_ARGS)
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{
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#define PG_STAT_GET_WAL_RECEIVER_COLS 11
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TupleDesc tupdesc;
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Datum values[PG_STAT_GET_WAL_RECEIVER_COLS];
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bool nulls[PG_STAT_GET_WAL_RECEIVER_COLS];
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WalRcvData *walrcv = WalRcv;
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WalRcvState state;
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XLogRecPtr receive_start_lsn;
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TimeLineID receive_start_tli;
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XLogRecPtr received_lsn;
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TimeLineID received_tli;
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TimestampTz last_send_time;
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TimestampTz last_receipt_time;
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XLogRecPtr latest_end_lsn;
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TimestampTz latest_end_time;
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char *slotname;
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/* No WAL receiver, just return a tuple with NULL values */
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if (walrcv->pid == 0)
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PG_RETURN_NULL();
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/* Initialise values and NULL flags arrays */
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MemSet(values, 0, sizeof(values));
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MemSet(nulls, 0, sizeof(nulls));
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/* Initialise attributes information in the tuple descriptor */
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tupdesc = CreateTemplateTupleDesc(PG_STAT_GET_WAL_RECEIVER_COLS, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "pid",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "status",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "receive_start_lsn",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "receive_start_tli",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 5, "received_lsn",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 6, "received_tli",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 7, "last_msg_send_time",
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TIMESTAMPTZOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 8, "last_msg_receipt_time",
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TIMESTAMPTZOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 9, "latest_end_lsn",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 10, "latest_end_time",
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TIMESTAMPTZOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 11, "slot_name",
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TEXTOID, -1, 0);
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BlessTupleDesc(tupdesc);
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/* Take a lock to ensure value consistency */
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SpinLockAcquire(&walrcv->mutex);
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state = walrcv->walRcvState;
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receive_start_lsn = walrcv->receiveStart;
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receive_start_tli = walrcv->receiveStartTLI;
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received_lsn = walrcv->receivedUpto;
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received_tli = walrcv->receivedTLI;
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last_send_time = walrcv->lastMsgSendTime;
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last_receipt_time = walrcv->lastMsgReceiptTime;
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latest_end_lsn = walrcv->latestWalEnd;
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latest_end_time = walrcv->latestWalEndTime;
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slotname = pstrdup(walrcv->slotname);
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SpinLockRelease(&walrcv->mutex);
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/* Fetch values */
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values[0] = Int32GetDatum(walrcv->pid);
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if (!superuser())
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{
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/*
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* Only superusers can see details. Other users only get the pid
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* value to know whether it is a WAL receiver, but no details.
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*/
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MemSet(&nulls[1], true, PG_STAT_GET_WAL_RECEIVER_COLS - 1);
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}
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else
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{
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values[1] = CStringGetTextDatum(WalRcvGetStateString(state));
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if (XLogRecPtrIsInvalid(receive_start_lsn))
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nulls[2] = true;
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else
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values[2] = LSNGetDatum(receive_start_lsn);
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values[3] = Int32GetDatum(receive_start_tli);
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if (XLogRecPtrIsInvalid(received_lsn))
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nulls[4] = true;
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else
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values[4] = LSNGetDatum(received_lsn);
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values[5] = Int32GetDatum(received_tli);
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if (last_send_time == 0)
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nulls[6] = true;
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else
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values[6] = TimestampTzGetDatum(last_send_time);
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if (last_receipt_time == 0)
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nulls[7] = true;
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else
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values[7] = TimestampTzGetDatum(last_receipt_time);
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if (XLogRecPtrIsInvalid(latest_end_lsn))
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nulls[8] = true;
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else
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values[8] = LSNGetDatum(latest_end_lsn);
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if (latest_end_time == 0)
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nulls[9] = true;
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else
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values[9] = TimestampTzGetDatum(latest_end_time);
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if (*slotname == '\0')
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nulls[10] = true;
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else
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values[10] = CStringGetTextDatum(slotname);
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}
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/* Returns the record as Datum */
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PG_RETURN_DATUM(HeapTupleGetDatum(
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heap_form_tuple(tupdesc, values, nulls)));
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}
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@ -53,6 +53,6 @@
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*/
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/* yyyymmddN */
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#define CATALOG_VERSION_NO 201601052
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#define CATALOG_VERSION_NO 201601071
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#endif
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@ -2787,6 +2787,8 @@ DATA(insert OID = 2022 ( pg_stat_get_activity PGNSP PGUID 12 1 100 0 0 f f f
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DESCR("statistics: information about currently active backends");
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DATA(insert OID = 3099 ( pg_stat_get_wal_senders PGNSP PGUID 12 1 10 0 0 f f f f f t s r 0 0 2249 "" "{23,25,3220,3220,3220,3220,23,25}" "{o,o,o,o,o,o,o,o}" "{pid,state,sent_location,write_location,flush_location,replay_location,sync_priority,sync_state}" _null_ _null_ pg_stat_get_wal_senders _null_ _null_ _null_ ));
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DESCR("statistics: information about currently active replication");
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DATA(insert OID = 3317 ( pg_stat_get_wal_receiver PGNSP PGUID 12 1 0 0 0 f f f f f f s r 0 0 2249 "" "{23,25,3220,23,3220,23,1184,1184,3220,1184,25}" "{o,o,o,o,o,o,o,o,o,o,o}" "{pid,status,receive_start_lsn,receive_start_tli,received_lsn,received_tli,last_msg_send_time,last_msg_receipt_time,latest_end_lsn,latest_end_time,slot_name}" _null_ _null_ pg_stat_get_wal_receiver _null_ _null_ _null_ ));
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DESCR("statistics: information about WAL receiver");
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DATA(insert OID = 2026 ( pg_backend_pid PGNSP PGUID 12 1 0 0 0 f f f f t f s r 0 0 23 "" _null_ _null_ _null_ _null_ _null_ pg_backend_pid _null_ _null_ _null_ ));
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DESCR("statistics: current backend PID");
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DATA(insert OID = 1937 ( pg_stat_get_backend_pid PGNSP PGUID 12 1 0 0 0 f f f f t f s r 1 0 23 "23" _null_ _null_ _null_ _null_ _null_ pg_stat_get_backend_pid _null_ _null_ _null_ ));
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@ -14,6 +14,7 @@
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#include "access/xlog.h"
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#include "access/xlogdefs.h"
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#include "fmgr.h"
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#include "storage/latch.h"
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#include "storage/spin.h"
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#include "pgtime.h"
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@ -148,6 +149,7 @@ extern PGDLLIMPORT walrcv_disconnect_type walrcv_disconnect;
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/* prototypes for functions in walreceiver.c */
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extern void WalReceiverMain(void) pg_attribute_noreturn();
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extern Datum pg_stat_get_wal_receiver(PG_FUNCTION_ARGS);
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/* prototypes for functions in walreceiverfuncs.c */
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extern Size WalRcvShmemSize(void);
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@ -1848,6 +1848,19 @@ pg_stat_user_tables| SELECT pg_stat_all_tables.relid,
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pg_stat_all_tables.autoanalyze_count
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FROM pg_stat_all_tables
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WHERE ((pg_stat_all_tables.schemaname <> ALL (ARRAY['pg_catalog'::name, 'information_schema'::name])) AND (pg_stat_all_tables.schemaname !~ '^pg_toast'::text));
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pg_stat_wal_receiver| SELECT s.pid,
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s.status,
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s.receive_start_lsn,
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s.receive_start_tli,
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s.received_lsn,
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s.received_tli,
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s.last_msg_send_time,
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s.last_msg_receipt_time,
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s.latest_end_lsn,
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s.latest_end_time,
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s.slot_name
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FROM pg_stat_get_wal_receiver() s(pid, status, receive_start_lsn, receive_start_tli, received_lsn, received_tli, last_msg_send_time, last_msg_receipt_time, latest_end_lsn, latest_end_time, slot_name)
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WHERE (s.pid IS NOT NULL);
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pg_stat_xact_all_tables| SELECT c.oid AS relid,
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n.nspname AS schemaname,
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c.relname,
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