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pgstat: add WAL receiver status view & SRF

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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
2016-01-07 16:21:19 -03:00
parent 6b1a837f69
commit b1a9bad9e7
7 changed files with 279 additions and 1 deletions
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91
doc/src/sgml/monitoring.sgml
View File

@@ -300,6 +300,14 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
</entry>
</row>
<row>
<entry><structname>pg_stat_wal_receiver</><indexterm><primary>pg_stat_wal_receiver</primary></indexterm></entry>
<entry>Only one row, showing statistics about the WAL receiver from
that receiver's connected server.
See <xref linkend="pg-stat-wal-receiver-view"> for details.
</entry>
</row>
<row>
<entry><structname>pg_stat_ssl</><indexterm><primary>pg_stat_ssl</primary></indexterm></entry>
<entry>One row per connection (regular and replication), showing information about
@@ -833,6 +841,89 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
listed; no information is available about downstream standby servers.
</para>
<table id="pg-stat-wal-receiver-view" xreflabel="pg_stat_wal_receiver">
<title><structname>pg_stat_wal_receiver</structname> View</title>
<tgroup cols="3">
<thead>
<row>
<entry>Column</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><structfield>pid</></entry>
<entry><type>integer</></entry>
<entry>Process ID of the WAL receiver process</entry>
</row>
<row>
<entry><structfield>status</></entry>
<entry><type>text</></entry>
<entry>Activity status of the WAL receiver process</entry>
</row>
<row>
<entry><structfield>receive_start_lsn</></entry>
<entry><type>pg_lsn</></entry>
<entry>First transaction log position used when WAL receiver is
started</entry>
</row>
<row>
<entry><structfield>receive_start_tli</></entry>
<entry><type>integer</></entry>
<entry>First timeline number used when WAL receiver is started</entry>
</row>
<row>
<entry><structfield>received_lsn</></entry>
<entry><type>pg_lsn</></entry>
<entry>Last transaction log position already received and flushed to
disk, the initial value of this field being the first log position used
when WAL receiver is started</entry>
</row>
<row>
<entry><structfield>received_tli</></entry>
<entry><type>integer</></entry>
<entry>Timeline number of last transaction log position received and
flushed to disk, the initial value of this field being the timeline
number of the first log position used when WAL receiver is started
</entry>
</row>
<row>
<entry><structfield>last_msg_send_time</></entry>
<entry><type>timestamp with time zone</></entry>
<entry>Send time of last message received from origin WAL sender</entry>
</row>
<row>
<entry><structfield>last_msg_receipt_time</></entry>
<entry><type>timestamp with time zone</></entry>
<entry>Receipt time of last message received from origin WAL sender</entry>
</row>
<row>
<entry><structfield>latest_end_lsn</></entry>
<entry><type>pg_lsn</></entry>
<entry>Last transaction log position reported to origin WAL sender</entry>
</row>
<row>
<entry><structfield>latest_end_time</></entry>
<entry><type>timestamp with time zone</></entry>
<entry>Time of last transaction log position reported to origin WAL sender</entry>
</row>
<row>
<entry><structfield>slot_name</></entry>
<entry><type>text</></entry>
<entry>Replication slot name used by this WAL receiver</entry>
</row>
</tbody>
</tgroup>
</table>
<para>
The <structname>pg_stat_wal_receiver</structname> view will contain only
one row, showing statistics about the WAL receiver from that receiver's
connected server.
</para>
<table id="pg-stat-ssl-view" xreflabel="pg_stat_ssl">
<title><structname>pg_stat_ssl</structname> View</title>
<tgroup cols="3">