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help / color / mirror / Atom feedFrom: Gyan Sreejith <[email protected]>
To: Kuroda, Hayato/黒田 隼人 <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: shveta malik <[email protected]>
Cc: Shlok Kyal <[email protected]>
Cc: vignesh C <[email protected]>
Cc: Euler Taveira <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Peter Smith <[email protected]>
Subject: Re: [Proposal] Adding Log File Capability to pg_createsubscriber
Date: Mon, 23 Mar 2026 21:23:29 -0400
Message-ID: <CAEqnbaULSSQcir8Z8KDXduV4o4NZvJLeBMZN0VW3wh5QZjpEnw@mail.gmail.com> (raw)
In-Reply-To: <OS9PR01MB12149FECFFF25973C167F9CFAF54BA@OS9PR01MB12149.jpnprd01.prod.outlook.com>
References: <OSOPR01MB1215385EAC6A76650444E40B0F54FA@OSOPR01MB12153.jpnprd01.prod.outlook.com>
<CAEqnbaU=EgqhxEx0ig4TdY8pdt0Vn+vmCJBuoORRHOzovW9dWA@mail.gmail.com>
<TYRPR01MB12156F431E4B83ECFF14034BDF54CA@TYRPR01MB12156.jpnprd01.prod.outlook.com>
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<CAA4eK1JiAzaY7UYnya7uDhX-kAL1PrsOAxBtys7c35t4q4H3_A@mail.gmail.com>
<CAEqnbaVF0yXQk=VVzr-8V23E=iUpUqyah6hxx2fy0ZVJh+CaGA@mail.gmail.com>
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<CAA4eK1JyYHPgaPTow5co8wBh8Ga+fx=vqHLhk2zHeqdOGYN4Vg@mail.gmail.com>
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On Mon, Mar 23, 2026 at 2:24 AM Chao Li <[email protected]> wrote:
+ /* Build timestamp directory path */
+ len = snprintf(logdir, MAXPGPATH, "%s/%s", log_basedir, timestamp);
+
+ if (len >= MAXPGPATH)
+ pg_fatal("directory path for log files, %s/%s, is too long",
+ logdir, timestamp);
```
> In the pg_fatal call, I believe logdir should be log_basedir.
We are writing into logdir, and the if will be true only if it is too long.
Hence we should be checking logdir.
> The biggest problem I see with this patch is here.
internal_log_file_write doesn’t handle “%m”. I think we can check the
implementation of pg_log_generic_v how %m is handled. The key code snippet
is:
```
> errno = save_errno;
> va_copy(ap2, ap);
> required_len = vsnprintf(NULL, 0, fmt, ap2) + 1;
> va_end(ap2);
```
> Where, vsnprintf points to pg_vsnprintf, and pg_vsnprintf calls dopr to
handle %m.
I have saved and restored errno similar to that. The code snippet you
pointed out is, as far as I understand, where they are calculating how much
space to allocate (including the \0 at the end). I think it will be handled
automatically as long as errno is not overwritten - which it will now be.
Thank you!
>The other problem is, with internal_log_file_write, HINT, DETAIL prefix
are no longer printed, is that intentional?
I could add a switch-case to print it out. Is that important? What do you
think?
I have fixed the rest of your suggestions. Thank you, Chao Li!
On Mon, Mar 23, 2026 at 5:55 AM shveta malik <[email protected]> wrote:
> We can get rid of below alignment related changes in unrelated test parts.
They are added when I run pgperltidy. Anyone else trying to change the file
after this would see the same thing if we don't change it. Should I move it
into another patch?
I have fixed the rest of it. Thank you, Shveta Malik!
On Mon, Mar 23, 2026 at 5:55 AM Kuroda, Hayato/黒田 隼人 <
[email protected]> wrote:
> 01.
> Found that pg_log_generic_v() has some prefix but
> internal_log_file_write() does not.
> It means output strings are not the same. For example, on terminal:
>
> ```
> pg_createsubscriber: error: standby server is running
> pg_createsubscriber: hint: Stop the standby server and try again.
> ```
>
> But on log file:
> ```
> standby server is running
> Stop the standby server and try again.
> ```
>
> It's because pg_log_generic_v() has the format like below. I.e., the
> program name
> is printed at the begining, and some prefix also exists in some cases.
>
> ${program name}: {error: |warning: |detail: |hint: } content
>
> I cannot find such a difference on pg_upgrade: no prefix exists in any
> cases.
> So, what should be here? My preference is to basically follow
> pg_log_generic_v()
> But remove the program name. How about others?
>
I haven't changed the output of pg_log_generic_v() yet. Shall I add the
prefix to the output? I have done the rest of your suggestions. Thank you!
Regards,
Gyan Sreejith
Attachments:
[application/x-patch] v17-0001-Add-a-new-argument-l-logdir-to-pg_createsubscrib.patch (16.4K, 3-v17-0001-Add-a-new-argument-l-logdir-to-pg_createsubscrib.patch)
download | inline diff:
From b83f96eb26f26162e06542c4f05226cca6b5613e Mon Sep 17 00:00:00 2001
From: Gyan Sreejith <[email protected]>
Date: Mon, 23 Mar 2026 21:21:56 -0400
Subject: [PATCH v17] Add a new argument -l <logdir> to pg_createsubscriber.
Enabling the option to write messages to log files in the specified directory.
A new directory is created if required. A subdirectory is created with timestamp as its name, and it will contain two new logfiles:
1. pg_createsubscriber_server.log - captures messages related to starting and stopping the standby server.
2. pg_createsubscriber_internal.log - captures internal diagnostic output from pg_createsubscriber.
For example, if we specify -l abc as an argument, and if the timestamp on running it is 20260119T204317.204, a directory abc is created if it doesn't exist already, with 20260119T204317.204 as its subdirectory and it will contain the two log files pg_createsubscriber_server.log and pg_createsubscriber_internal.log
---
doc/src/sgml/ref/pg_createsubscriber.sgml | 29 +++
src/bin/pg_basebackup/pg_createsubscriber.c | 174 +++++++++++++++++-
.../t/040_pg_createsubscriber.pl | 48 ++++-
3 files changed, 239 insertions(+), 12 deletions(-)
diff --git a/doc/src/sgml/ref/pg_createsubscriber.sgml b/doc/src/sgml/ref/pg_createsubscriber.sgml
index 6e17cee18eb..5ac61c7b558 100644
--- a/doc/src/sgml/ref/pg_createsubscriber.sgml
+++ b/doc/src/sgml/ref/pg_createsubscriber.sgml
@@ -136,6 +136,35 @@ PostgreSQL documentation
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>-l <replaceable class="parameter">directory</replaceable></option></term>
+ <term><option>--logdir=<replaceable class="parameter">directory</replaceable></option></term>
+ <listitem>
+ <para>
+ Specify the name of the log directory. A new directory is created with
+ this name if it does not exist. A subdirectory with a timestamp
+ indicating the time at which <application>pg_createsubscriber</application>
+ was run will be created. The following two log files will be created in
+ the subdirectory with a umask of 077 so that access is disallowed to
+ other users by default.
+ <itemizedlist>
+ <listitem>
+ <para>
+ <filename>pg_createsubscriber_server.log</filename> which captures logs
+ related to stopping and starting the standby server,
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <filename>pg_createsubscriber_internal.log</filename> which captures
+ internal diagnostic output (validations, checks, etc.)
+ </para>
+ </listitem>
+ </itemizedlist>
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><option>-n</option></term>
<term><option>--dry-run</option></term>
diff --git a/src/bin/pg_basebackup/pg_createsubscriber.c b/src/bin/pg_basebackup/pg_createsubscriber.c
index b2bc9dae0b8..63ffd337613 100644
--- a/src/bin/pg_basebackup/pg_createsubscriber.c
+++ b/src/bin/pg_basebackup/pg_createsubscriber.c
@@ -20,6 +20,7 @@
#include "common/connect.h"
#include "common/controldata_utils.h"
+#include "common/file_perm.h"
#include "common/file_utils.h"
#include "common/logging.h"
#include "common/pg_prng.h"
@@ -49,10 +50,14 @@
#define INCLUDED_CONF_FILE "pg_createsubscriber.conf"
#define INCLUDED_CONF_FILE_DISABLED INCLUDED_CONF_FILE ".disabled"
+#define SERVER_LOG_FILE_NAME "pg_createsubscriber_server"
+#define INTERNAL_LOG_FILE_NAME "pg_createsubscriber_internal"
+
/* Command-line options */
struct CreateSubscriberOptions
{
char *config_file; /* configuration file */
+ char *log_dir; /* log directory name */
char *pub_conninfo_str; /* publisher connection string */
char *socket_dir; /* directory for Unix-domain socket, if any */
char *sub_port; /* subscriber port number */
@@ -149,8 +154,14 @@ static void get_publisher_databases(struct CreateSubscriberOptions *opt,
static void report_createsub_log(enum pg_log_level, enum pg_log_part,
const char *pg_restrict fmt,...)
pg_attribute_printf(3, 4);
+static void report_createsub_log_v(enum pg_log_level level, enum pg_log_part part,
+ const char *pg_restrict fmt, va_list args)
+ pg_attribute_printf(3, 0);
pg_noreturn static void report_createsub_fatal(const char *pg_restrict fmt,...)
pg_attribute_printf(1, 2);
+static void internal_log_file_write(enum pg_log_level level,
+ const char *pg_restrict fmt, va_list args)
+ pg_attribute_printf(2, 0);
#define WAIT_INTERVAL 1 /* 1 second */
@@ -172,6 +183,9 @@ static pg_prng_state prng_state;
static char *pg_ctl_path = NULL;
static char *pg_resetwal_path = NULL;
+static FILE *internal_log_file_fp = NULL; /* File ptr to log all messages to */
+static char logdir[MAXPGPATH]; /* Directory log files are put (if specified) */
+
/* standby / subscriber data directory */
static char *subscriber_dir = NULL;
@@ -180,8 +194,29 @@ static bool standby_running = false;
static bool recovery_params_set = false;
/*
- * Report a message with a given log level
+ * Report a message with a given log level to stderr and log file
+ * (if specified).
*/
+static void
+report_createsub_log_v(enum pg_log_level level, enum pg_log_part part,
+ const char *pg_restrict fmt, va_list args)
+{
+ int save_errno = errno;
+
+ if (internal_log_file_fp != NULL)
+ {
+ /* Output to both stderr and the log file */
+ va_list arg_cpy;
+
+ va_copy(arg_cpy, args);
+ internal_log_file_write(level, fmt, arg_cpy);
+ va_end(arg_cpy);
+ /* Restore errno in case internal_log_file_write changed it */
+ errno = save_errno;
+ }
+ pg_log_generic_v(level, part, fmt, args);
+}
+
static void
report_createsub_log(enum pg_log_level level, enum pg_log_part part,
const char *pg_restrict fmt,...)
@@ -190,7 +225,7 @@ report_createsub_log(enum pg_log_level level, enum pg_log_part part,
va_start(args, fmt);
- pg_log_generic_v(level, part, fmt, args);
+ report_createsub_log_v(level, part, fmt, args);
va_end(args);
}
@@ -205,7 +240,7 @@ report_createsub_fatal(const char *pg_restrict fmt,...)
va_start(args, fmt);
- pg_log_generic_v(PG_LOG_ERROR, PG_LOG_PRIMARY, fmt, args);
+ report_createsub_log_v(PG_LOG_ERROR, PG_LOG_PRIMARY, fmt, args);
va_end(args);
@@ -313,6 +348,13 @@ cleanup_objects_atexit(void)
if (standby_running)
stop_standby_server(subscriber_dir);
+
+ if (internal_log_file_fp != NULL)
+ {
+ if (fclose(internal_log_file_fp) != 0)
+ report_createsub_fatal("could not close %s/%s.log: %m", logdir, INTERNAL_LOG_FILE_NAME);
+ internal_log_file_fp = NULL;
+ }
}
static void
@@ -327,6 +369,7 @@ usage(void)
" databases and databases that don't allow connections\n"));
printf(_(" -d, --database=DBNAME database in which to create a subscription\n"));
printf(_(" -D, --pgdata=DATADIR location for the subscriber data directory\n"));
+ printf(_(" -l, --logdir=LOGDIR location for the log directory\n"));
printf(_(" -n, --dry-run dry run, just show what would be done\n"));
printf(_(" -p, --subscriber-port=PORT subscriber port number (default %s)\n"), DEFAULT_SUB_PORT);
printf(_(" -P, --publisher-server=CONNSTR publisher connection string\n"));
@@ -761,6 +804,7 @@ modify_subscriber_sysid(const struct CreateSubscriberOptions *opt)
bool crc_ok;
struct timeval tv;
+ char *out_file;
char *cmd_str;
report_createsub_log(PG_LOG_INFO, PG_LOG_PRIMARY,
@@ -799,8 +843,20 @@ modify_subscriber_sysid(const struct CreateSubscriberOptions *opt)
report_createsub_log(PG_LOG_INFO, PG_LOG_PRIMARY,
"running pg_resetwal on the subscriber");
- cmd_str = psprintf("\"%s\" -D \"%s\" > \"%s\"", pg_resetwal_path,
- subscriber_dir, DEVNULL);
+ /*
+ * Redirecting the output to the logfile if specified. Since the output
+ * would be very short, around one line, we do not provide a separate file
+ * for it; it's done as a part of the server log.
+ */
+ if (opt->log_dir)
+ out_file = psprintf("%s/%s.log", logdir, SERVER_LOG_FILE_NAME);
+ else
+ out_file = DEVNULL;
+
+ cmd_str = psprintf("\"%s\" -D \"%s\" >> \"%s\"", pg_resetwal_path,
+ subscriber_dir, out_file);
+ if (opt->log_dir)
+ pg_free(out_file);
report_createsub_log(PG_LOG_DEBUG, PG_LOG_PRIMARY,
"pg_resetwal command is: %s", cmd_str);
@@ -817,6 +873,7 @@ modify_subscriber_sysid(const struct CreateSubscriberOptions *opt)
}
pg_free(cf);
+ pg_free(cmd_str);
}
/*
@@ -1023,6 +1080,89 @@ server_is_in_recovery(PGconn *conn)
return ret == 0;
}
+static void
+internal_log_file_write(enum pg_log_level level, const char *pg_restrict fmt,
+ va_list args)
+{
+ Assert(internal_log_file_fp);
+
+ /* Do nothing if log level is too low. */
+ if (level < __pg_log_level)
+ return;
+
+ vfprintf(internal_log_file_fp, _(fmt), args);
+
+ fprintf(internal_log_file_fp, "\n");
+ fflush(internal_log_file_fp);
+}
+
+/*
+ * Open a new logfile with proper permissions.
+ * From src/backend/postmaster/syslogger.c
+ */
+static FILE *
+logfile_open(const char *filename, const char *mode)
+{
+ FILE *fh;
+ mode_t oumask;
+
+ oumask = umask((mode_t) ((~(S_IRUSR | S_IWUSR)) & (S_IRWXU | S_IRWXG | S_IRWXO)));
+ fh = fopen(filename, mode);
+ umask(oumask);
+
+ if (fh)
+ {
+ setvbuf(fh, NULL, PG_IOLBF, 0);
+
+#ifdef WIN32
+ /* use CRLF line endings on Windows */
+ _setmode(_fileno(fh), _O_TEXT);
+#endif
+ }
+ else
+ report_createsub_fatal("could not open log file \"%s\": %m",
+ filename);
+
+ return fh;
+}
+
+static void
+make_output_dirs(const char *log_basedir)
+{
+ char timestamp[128];
+ struct timeval tval;
+ time_t now;
+ struct tm tmbuf;
+ int len;
+
+ /* Generate timestamp */
+ gettimeofday(&tval, NULL);
+ now = tval.tv_sec;
+
+ strftime(timestamp, sizeof(timestamp), "%Y%m%dT%H%M%S",
+ localtime_r(&now, &tmbuf));
+
+ /* Append milliseconds */
+ snprintf(timestamp + strlen(timestamp),
+ sizeof(timestamp) - strlen(timestamp), ".%03u",
+ (unsigned int) (tval.tv_usec / 1000));
+
+ /* Build timestamp directory path */
+ len = snprintf(logdir, MAXPGPATH, "%s/%s", log_basedir, timestamp);
+
+ if (len >= MAXPGPATH)
+ report_createsub_fatal("directory path for log files, %s/%s, is too long",
+ logdir, timestamp);
+
+ /* Create base directory (ignore if exists) */
+ if (mkdir(log_basedir, pg_dir_create_mode) < 0 && errno != EEXIST)
+ report_createsub_fatal("could not create directory \"%s\": %m", log_basedir);
+
+ /* Create a timestamp-named subdirectory under the base directory */
+ if (mkdir(logdir, pg_dir_create_mode) < 0)
+ report_createsub_fatal("could not create directory \"%s\": %m", logdir);
+}
+
/*
* Is the primary server ready for logical replication?
*
@@ -1781,6 +1921,9 @@ start_standby_server(const struct CreateSubscriberOptions *opt, bool restricted_
if (restrict_logical_worker)
appendPQExpBufferStr(pg_ctl_cmd, " -o \"-c max_logical_replication_workers=0\"");
+ if (opt->log_dir)
+ appendPQExpBuffer(pg_ctl_cmd, " -l \"%s/%s.log\"", logdir, SERVER_LOG_FILE_NAME);
+
report_createsub_log(PG_LOG_DEBUG, PG_LOG_PRIMARY,
"pg_ctl command is: %s", pg_ctl_cmd->data);
rc = system(pg_ctl_cmd->data);
@@ -2351,6 +2494,7 @@ main(int argc, char **argv)
{"all", no_argument, NULL, 'a'},
{"database", required_argument, NULL, 'd'},
{"pgdata", required_argument, NULL, 'D'},
+ {"logdir", required_argument, NULL, 'l'},
{"dry-run", no_argument, NULL, 'n'},
{"subscriber-port", required_argument, NULL, 'p'},
{"publisher-server", required_argument, NULL, 'P'},
@@ -2409,6 +2553,7 @@ main(int argc, char **argv)
/* Default settings */
subscriber_dir = NULL;
opt.config_file = NULL;
+ opt.log_dir = NULL;
opt.pub_conninfo_str = NULL;
opt.socket_dir = NULL;
opt.sub_port = DEFAULT_SUB_PORT;
@@ -2439,7 +2584,7 @@ main(int argc, char **argv)
get_restricted_token();
- while ((c = getopt_long(argc, argv, "ad:D:np:P:s:t:TU:v",
+ while ((c = getopt_long(argc, argv, "ad:D:l:np:P:s:t:TU:v",
long_options, &option_index)) != -1)
{
switch (c)
@@ -2460,6 +2605,10 @@ main(int argc, char **argv)
subscriber_dir = pg_strdup(optarg);
canonicalize_path(subscriber_dir);
break;
+ case 'l':
+ opt.log_dir = pg_strdup(optarg);
+ canonicalize_path(opt.log_dir);
+ break;
case 'n':
dry_run = true;
break;
@@ -2607,6 +2756,19 @@ main(int argc, char **argv)
exit(1);
}
+ if (opt.log_dir != NULL)
+ {
+ char *internal_log_file;
+
+ make_output_dirs(opt.log_dir);
+ internal_log_file = psprintf("%s/%s.log", logdir,
+ INTERNAL_LOG_FILE_NAME);
+
+ /* logfile_open() will exit if there is an error */
+ internal_log_file_fp = logfile_open(internal_log_file, "a");
+ pg_free(internal_log_file);
+ }
+
if (dry_run)
report_createsub_log(PG_LOG_INFO, PG_LOG_PRIMARY,
"Executing in dry-run mode.\n"
diff --git a/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl b/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl
index 0c27fca7bb7..239ea58d9a0 100644
--- a/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl
+++ b/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl
@@ -5,6 +5,8 @@
use strict;
use warnings FATAL => 'all';
+use File::Basename;
+use File::stat;
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;
@@ -14,6 +16,7 @@ program_version_ok('pg_createsubscriber');
program_options_handling_ok('pg_createsubscriber');
my $datadir = PostgreSQL::Test::Utils::tempdir;
+my $logdir = PostgreSQL::Test::Utils::tempdir;
# Generate a database with a name made of a range of ASCII characters.
# Extracted from 002_pg_upgrade.pl.
@@ -362,9 +365,40 @@ command_ok(
'--subscription' => 'sub2',
'--database' => $db1,
'--database' => $db2,
+ '--logdir' => $logdir,
],
'run pg_createsubscriber --dry-run on node S');
+# Check that the log files were created
+my @server_log_files = glob "$logdir/*/pg_createsubscriber_server.log";
+is(scalar(@server_log_files),
+ 1, "pg_createsubscriber_server.log file was created");
+my $server_log_file_size = -s $server_log_files[0];
+isnt($server_log_file_size, 0,
+ "pg_createsubscriber_server.log file not empty");
+my $server_log = slurp_file($server_log_files[0]);
+like(
+ $server_log,
+ qr/consistent recovery state reached/,
+ "server reached consistent recovery state");
+
+my @internal_log_files = glob "$logdir/*/pg_createsubscriber_internal.log";
+is(scalar(@internal_log_files),
+ 1, "pg_createsubscriber_internal.log file was created");
+my $internal_log_file_size = -s $internal_log_files[0];
+isnt($internal_log_file_size, 0,
+ "pg_createsubscriber_internal.log file not empty");
+my $internal_log = slurp_file($internal_log_files[0]);
+like(
+ $internal_log,
+ qr/target server reached the consistent state/,
+ "log shows consistent state reached");
+my $timestamp_dir = dirname($internal_log_files[0]);
+my $timestamp_dir_stat = stat($timestamp_dir);
+my $timestamp_dir_mode = $timestamp_dir_stat->mode & 07777;
+is($timestamp_dir_mode, 0700,
+ "Directory with .log files has permissions S_IRWXU");
+
# Check if node S is still a standby
$node_s->start;
is($node_s->safe_psql('postgres', 'SELECT pg_catalog.pg_is_in_recovery()'),
@@ -444,7 +478,8 @@ is(scalar(() = $stderr =~ /would create subscription/g),
# Create a user-defined publication, and a table that is not a member of that
# publication.
-$node_p->safe_psql($db1, qq(
+$node_p->safe_psql(
+ $db1, qq(
CREATE PUBLICATION test_pub3 FOR TABLE tbl1;
CREATE TABLE not_replicated (a int);
));
@@ -540,8 +575,7 @@ second row
third row),
"logical replication works in database $db1");
$result = $node_s->safe_psql($db1, 'SELECT * FROM not_replicated');
-is($result, qq(),
- "table is not replicated in database $db1");
+is($result, qq(), "table is not replicated in database $db1");
# Check result in database $db2
$result = $node_s->safe_psql($db2, 'SELECT * FROM tbl2');
@@ -555,8 +589,10 @@ my $sysid_s = $node_s->safe_psql('postgres',
isnt($sysid_p, $sysid_s, 'system identifier was changed');
# Verify that pub2 was created in $db2
-is($node_p->safe_psql($db2, "SELECT COUNT(*) FROM pg_publication WHERE pubname = 'pub2'"),
- '1', "publication pub2 was created in $db2");
+is( $node_p->safe_psql(
+ $db2, "SELECT COUNT(*) FROM pg_publication WHERE pubname = 'pub2'"),
+ '1',
+ "publication pub2 was created in $db2");
# Get subscription and publication names
$result = $node_s->safe_psql(
@@ -581,7 +617,7 @@ $result = $node_s->safe_psql(
)
);
-is($result, qq($db1|{test_pub3}
+is( $result, qq($db1|{test_pub3}
$db2|{pub2}),
"subscriptions use the correct publications");
--
2.43.0
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Subject: Re: [Proposal] Adding Log File Capability to pg_createsubscriber
In-Reply-To: <CAEqnbaULSSQcir8Z8KDXduV4o4NZvJLeBMZN0VW3wh5QZjpEnw@mail.gmail.com>
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