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Commit6ae578a

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Set fallback_application_name for a walreceiver to cluster_name
By default, the fallback_application_name for a physical walreceiveris "walreceiver". This means that multiple standbys cannot bedistinguished easily on a primary, for example in pg_stat_activity orsynchronous_standby_names.If cluster_name is set, use that for fallback_application_name in thewalreceiver. (If it's not set, it remains "walreceiver".) If someoneset cluster_name to identify their instance, we might as well use thatby default to identify the node remotely as well. It's still possibleto specify another application_name in primary_conninfo explicitly.Reviewed-by: Euler Taveira <euler@timbira.com.br>Discussion:https://www.postgresql.org/message-id/flat/1257eaee-4874-e791-e83a-46720c72cac7@2ndquadrant.com
1 parent414a9d3 commit6ae578a

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‎doc/src/sgml/config.sgml‎

Lines changed: 11 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -3659,7 +3659,8 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows
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<varname>application_name</varname> setting of the standby, as set in the
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standby's connection information. In case of a physical replication
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standby, this should be set in the <varname>primary_conninfo</varname>
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setting; the default is <literal>walreceiver</literal>.
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setting; the default is the setting of <xref linkend="guc-cluster-name"/>
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if set, else <literal>walreceiver</literal>.
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For logical replication, this can be set in the connection
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information of the subscription, and it defaults to the
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subscription name. For other replication stream consumers,
@@ -6560,8 +6561,15 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
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</term>
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<listitem>
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<para>
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Sets the cluster name that appears in the process title for all
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server processes in this cluster. The name can be any string of less
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Sets a name that identifies this database cluster (instance) for
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various purposes. The cluster name appears in the process title for
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all server processes in this cluster. Moreover, it is the default
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application name for a standby connection (see <xref
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linkend="guc-synchronous-standby-names"/>.)
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</para>
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<para>
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The name can be any string of less
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than <symbol>NAMEDATALEN</symbol> characters (64 characters in a standard
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build). Only printable ASCII characters may be used in the
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<varname>cluster_name</varname> value. Other characters will be

‎src/backend/replication/walreceiver.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -293,7 +293,7 @@ WalReceiverMain(void)
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/* Establish the connection to the primary for XLOG streaming */
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EnableWalRcvImmediateExit();
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wrconn=walrcv_connect(conninfo, false,"walreceiver",&err);
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wrconn=walrcv_connect(conninfo, false,cluster_name[0] ?cluster_name :"walreceiver",&err);
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if (!wrconn)
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ereport(ERROR,
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(errmsg("could not connect to the primary server: %s",err)));

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