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Commitb8fdee7

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Add %P to log_line_prefix for parallel group leader
This is useful for monitoring purposes with log parsing. Similarly topg_stat_activity, the leader's PID is shown only for active parallelworkers, minimizing the log footprint for the leaders as the equivalentshared memory field is set as long as a backend is alive.Author: Justin PryzbyReviewed-by: Álvaro Herrera, Michael Paquier, Julien Rouhaud, Tom LaneDiscussion:https://postgr.es/m/20200315111831.GA21492@telsasoft.com
1 parentf44b9b6 commitb8fdee7

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3 files changed

+47
-1
lines changed

3 files changed

+47
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lines changed

‎doc/src/sgml/config.sgml

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6694,6 +6694,12 @@ local0.* /var/log/postgresql
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<entry>Process ID</entry>
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<entry>no</entry>
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</row>
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<row>
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<entry><literal>%P</literal></entry>
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<entry>Process ID of the parallel group leader, if this process
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is a parallel query worker</entry>
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<entry>no</entry>
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</row>
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<row>
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<entry><literal>%t</literal></entry>
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<entry>Time stamp without milliseconds</entry>
@@ -7026,7 +7032,7 @@ log_line_prefix = '%m [%p] %q%u@%d/%a '
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character count of the error position therein,
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location of the error in the PostgreSQL source code
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(if <varname>log_error_verbosity</varname> is set to <literal>verbose</literal>),
7029-
application name,andbackend type.
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application name, backend type, and process ID of parallel group leader.
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Here is a sample table definition for storing CSV-format log output:
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<programlisting>
@@ -7056,6 +7062,7 @@ CREATE TABLE postgres_log
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location text,
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application_name text,
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backend_type text,
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leader_pid integer,
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PRIMARY KEY (session_id, session_line_num)
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);
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</programlisting>

‎src/backend/utils/error/elog.c

Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2448,6 +2448,29 @@ log_line_prefix(StringInfo buf, ErrorData *edata)
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else
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appendStringInfo(buf,"%d",MyProcPid);
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break;
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2452+
case'P':
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if (MyProc)
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{
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PGPROC*leader=MyProc->lockGroupLeader;
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/*
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* Show the leader only for active parallel workers. This
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* leaves out the leader of a parallel group.
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*/
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if (leader==NULL||leader->pid==MyProcPid)
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appendStringInfoSpaces(buf,
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padding>0 ?padding :-padding);
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elseif (padding!=0)
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appendStringInfo(buf,"%*d",padding,leader->pid);
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else
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appendStringInfo(buf,"%d",leader->pid);
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}
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elseif (padding!=0)
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appendStringInfoSpaces(buf,
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padding>0 ?padding :-padding);
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break;
2473+
24512474
case'l':
24522475
if (padding!=0)
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appendStringInfo(buf,"%*ld",padding,log_line_number);
@@ -2836,6 +2859,21 @@ write_csvlog(ErrorData *edata)
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else
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appendCSVLiteral(&buf,GetBackendTypeDesc(MyBackendType));
28382861

2862+
appendStringInfoChar(&buf,',');
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2864+
/* leader PID */
2865+
if (MyProc)
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{
2867+
PGPROC*leader=MyProc->lockGroupLeader;
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/*
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* Show the leader only for active parallel workers. This leaves out
2871+
* the leader of a parallel group.
2872+
*/
2873+
if (leader&&leader->pid!=MyProcPid)
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appendStringInfo(&buf,"%d",leader->pid);
2875+
}
2876+
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appendStringInfoChar(&buf,'\n');
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/* If in the syslogger process, try to write messages direct to file */

‎src/backend/utils/misc/postgresql.conf.sample

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -537,6 +537,7 @@
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# %h = remote host
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# %b = backend type
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# %p = process ID
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# %P = process ID of parallel group leader
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# %t = timestamp without milliseconds
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# %m = timestamp with milliseconds
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# %n = timestamp with milliseconds (as a Unix epoch)

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