Re: Re: In-core regression tests for replication, cascading, archiving, PITR, etc.

From: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
To: Noah Misch <noah(at)leadboat(dot)com>
Cc: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Amir Rohan <amir(dot)rohan(at)zoho(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>, Greg Smith <gsmith(at)gregsmith(dot)com>
Subject: Re: Re: In-core regression tests for replication, cascading, archiving, PITR, etc.
Date: 2015-12-07 05:34:39
Message-ID: CAB7nPqSf=SyF7Fu7Cs7GScfXr4B9F5Za-oN=7e9hQMkzKVuzxg@mail.gmail.com
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On Mon, Dec 7, 2015 at 12:06 PM, Noah Misch <noah(at)leadboat(dot)com> wrote:
> On Wed, Dec 02, 2015 at 06:59:09PM -0300, Alvaro Herrera wrote:
>> --- a/src/bin/pg_basebackup/t/010_pg_basebackup.pl
>> +++ b/src/bin/pg_basebackup/t/010_pg_basebackup.pl
>
>> -like($recovery_conf, qr/^standby_mode = 'on[']$/m, 'recovery.conf sets standby_mode');
>> -like($recovery_conf, qr/^primary_conninfo = '.*port=$ENV{PGPORT}.*'$/m, 'recovery.conf sets primary_conninfo');
>> -
>> -command_ok([ 'pg_basebackup', '-D', "$tempdir/backupxf", '-X', 'fetch' ],
>> +like(
>> + $recovery_conf,
>> + qr/^standby_mode = 'on[']$/m,
>> + 'recovery.conf sets standby_mode');
>> +like(
>> + $recovery_conf,
>> + qr/^primary_conninfo = '.*port=$ENV{PGPORT}.*'$/m,
>> + 'recovery.conf sets primary_conninfo');
>
> This now elicits a diagnostic:
>
> Use of uninitialized value $ENV{"PGPORT"} in regexp compilation at t/010_pg_basebackup.pl line 175, <> line 1.

Fixed.

>> --- a/src/bin/pg_controldata/t/001_pg_controldata.pl
>> +++ b/src/bin/pg_controldata/t/001_pg_controldata.pl
>
>> -standard_initdb "$tempdir/data";
>> -command_like([ 'pg_controldata', "$tempdir/data" ],
>> +
>> +my $node = get_new_node();
>> +$node->init;
>> +$node->start;
>
> Before the commit, this test did not start a server.

Fixed.

>> --- /dev/null
>> +++ b/src/test/perl/PostgresNode.pm
>
>> +sub _update_pid
>> +{
>> + my $self = shift;
>> +
>> + # If we can open the PID file, read its first line and that's the PID we
>> + # want. If the file cannot be opened, presumably the server is not
>> + # running; don't be noisy in that case.
>> + open my $pidfile, $self->data_dir . "/postmaster.pid";
>> + if (not defined $pidfile)
>
> $ grep -h 'at /.*line' src/bin/*/tmp_check/log/* |sort|uniq -c
> 1 cannot remove directory for /data/nmisch/src/pg/postgresql/src/bin/scripts/tmp_testNNCZ: Directory not empty at /home/nmisch/sw/cpan/lib/perl5/File/Temp.pm line 784
> 1 cannot remove directory for /data/nmisch/src/pg/postgresql/src/bin/scripts/tmp_testNNCZ/pgdata/base/13264: Directory not empty at /home/nmisch/sw/cpan/lib/perl5/File/Temp.pm line 784
> 1 cannot remove directory for /data/nmisch/src/pg/postgresql/src/bin/scripts/tmp_testNNCZ/pgdata/base: Directory not empty at /home/nmisch/sw/cpan/lib/perl5/File/Temp.pm line 784
> 1 cannot remove directory for /data/nmisch/src/pg/postgresql/src/bin/scripts/tmp_testNNCZ/pgdata: Directory not empty at /home/nmisch/sw/cpan/lib/perl5/File/Temp.pm line 784
> 28 readline() on closed filehandle $pidfile at /data/nmisch/src/pg/postgresql/src/bin/pg_rewind/../../../src/test/perl/PostgresNode.pm line 308.
> 28 Use of uninitialized value in concatenation (.) or string at /data/nmisch/src/pg/postgresql/src/bin/pg_rewind/../../../src/test/perl/PostgresNode.pm line 309.
>
> $pidfile is always defined. Test the open() return value.

That's something I have addressed here:
http://www.postgresql.org/message-id/CAB7nPqTOP28Zxv_SXFo2axGJoesfvLLMO6syddAfV0DUvsFMDw@mail.gmail.com
I am including the fix as well here to do a group shot.

>> + {
>> + $self->{_pid} = undef;
>> + print "# No postmaster PID\n";
>> + return;
>> + }
>> +
>> + $self->{_pid} = <$pidfile>;
>
> chomp() that value to remove its trailing newline.

Right.

>> + print "# Postmaster PID is $self->{_pid}\n";
>> + close $pidfile;
>> +}
>
>> + my $devnull = $TestLib::windows_os ? "nul" : "/dev/null";
>
> Unused variable.

Removed.

>> +sub DESTROY
>> +{
>> + my $self = shift;
>> + return if not defined $self->{_pid};
>> + print "# signalling QUIT to $self->{_pid}\n";
>> + kill 'QUIT', $self->{_pid};
>
> On Windows, that kill() is the wrong thing. I suspect "pg_ctl kill" will be
> the right thing, but that warrants specific testing.

I don't directly see any limitation with the use of kill on Windows..
http://perldoc.perl.org/functions/kill.html
But indeed using directly pg_ctl kill seems like a better fit for the
PG infrastructure.

> Postmaster log file names became less informative. Before the commit:
> Should nodes get a name, so we instead see master_57834.log?

I am not sure that this is necessary. There is definitely a limitation
regarding the fact that log files of nodes get overwritten after each
test, hence I would tend with just appending the test name in front of
the node_* files similarly to the other files.

> See also the things Tom Lane identified in <27550(dot)1449342569(at)sss(dot)pgh(dot)pa(dot)us>.

Yep, I marked this email as something to address when it was sent.

On Sun, Dec 6, 2015 at 4:09 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> BTW, if we consider that gospel, why has PostgresNode.pm got this in its
> BEGIN block?
>
> # PGHOST is set once and for all through a single series of tests when
> # this module is loaded.
> $test_pghost =
> $TestLib::windows_os ? "127.0.0.1" : TestLib::tempdir_short;
> $ENV{PGHOST} = $test_pghost;
>
> On non-Windows machines, the call of tempdir_short will result in
> filesystem activity, ie creation of a directory. Offhand it looks like
> all of the activity in this BEGIN block could go to an INIT block instead.

OK, the whole block is switched to INIT instead.

> I'm also bemused by why there was any question about this being wrong:
>
> # XXX: Should this use PG_VERSION_NUM?
> $last_port_assigned = 90600 % 16384 + 49152;

> If that's not a hard-coded PG version number then I don't know
> what it is. Maybe it would be better to use random() instead,
> but surely this isn't good as-is.

We would definitely want something within the ephemeral port range, so
we are up to that:
rand() * 16384 + 49152;

All those issues are addressed as per the patch attached.
Regards,
--
Michael

Attachment Content-Type Size
20151206_tap_fixes.patch text/x-diff 3.5 KB

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