From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
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To: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
Cc: | Julien Rouhaud <rjuju123(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: expose parallel leader in CSV and log_line_prefix |
Date: | 2020-07-10 16:45:29 |
Message-ID: | 20200710164529.GA23646@alvherre.pgsql |
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Lists: | pgsql-hackers |
On 2020-Mar-18, Justin Pryzby wrote:
> On Sun, Mar 15, 2020 at 12:49:33PM +0100, Julien Rouhaud wrote:
> template1=# SET log_temp_files=0; explain analyze SELECT a,COUNT(1) FROM t a JOIN t b USING(a) GROUP BY 1;
> 2020-03-15 21:20:47.288 CDT [5537 5537]LOG: statement: SET log_temp_files=0;
> SET
> 2020-03-15 21:20:47.289 CDT [5537 5537]LOG: statement: explain analyze SELECT a,COUNT(1) FROM t a JOIN t b USING(a) GROUP BY 1;
> 2020-03-15 21:20:51.253 CDT [5627 5537]LOG: temporary file: path "base/pgsql_tmp/pgsql_tmp5627.0", size 6094848
> 2020-03-15 21:20:51.253 CDT [5627 5537]STATEMENT: explain analyze SELECT a,COUNT(1) FROM t a JOIN t b USING(a) GROUP BY 1;
> 2020-03-15 21:20:51.254 CDT [5626 5537]LOG: temporary file: path "base/pgsql_tmp/pgsql_tmp5626.0", size 6103040
> 2020-03-15 21:20:51.254 CDT [5626 5537]STATEMENT: explain analyze SELECT a,COUNT(1) FROM t a JOIN t b USING(a) GROUP BY 1;
> 2020-03-15 21:20:51.263 CDT [5537 5537]LOG: temporary file: path "base/pgsql_tmp/pgsql_tmp5537.1.sharedfileset/o15of16.p0.0", size 557056
I think it's overly verbose; all non-parallel backends are going to get
their own PID twice, and I'm not sure this is going to be great to
parse. I think it would be more sensible that if the process does not
have a parent (leader), %P expands to empty.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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