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pt-osc now limits size of contraint names

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This commit is contained in:
frank-cizmich
2015-05-22 17:03:32 -03:00
parent 66c74af47b
commit 21a9c35f5c
3 changed files with 151 additions and 2 deletions
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27
bin/pt-online-schema-change
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@@ -9861,7 +9861,17 @@ sub create_new_table {
my $quoted = $q->quote($orig_tbl->{db}, $new_table_name);
my $sql = $ddl;
$sql =~ s/\ACREATE TABLE .*?\($/CREATE TABLE $quoted (/m;
# If it has a leading underscore, we remove one, otherwise we add one
# This is in contrast to previous behavior were we added underscores
# indefinitely, sometimes exceeding the allowed name limit
# https://bugs.launchpad.net/percona-toolkit/+bug/1215587
if ( $sql =~ /CONSTRAINT `_/ ) {
$sql =~ s/^ CONSTRAINT `_/ CONSTRAINT `/gm;
} else {
$sql =~ s/^ CONSTRAINT `/ CONSTRAINT `_/gm;
}
if ( $o->get('default-engine') ) {
$sql =~ s/\s+ENGINE=\S+//;
}
@@ -10200,8 +10210,23 @@ sub rebuild_constraints {
# `actor` (`actor_id`) ON UPDATE CASCADE
# Reference the correct table name...
$constraint =~ s/REFERENCES[^\(]+/REFERENCES $orig_tbl->{name} /;
# And rename the constraint to avoid conflict
$constraint =~ s/CONSTRAINT `$fk`/CONSTRAINT `_$fk`/;
# If it has a leading underscore, we remove one, otherwise we add one
# This is in contrast to previous behavior were we added underscores
# indefinitely, sometimes exceeding the allowed name limit
# https://bugs.launchpad.net/percona-toolkit/+bug/1215587
my $new_fk;
if ($fk =~ /^_/) {
($new_fk = $fk) =~ s/^_//;
}else {
$new_fk = '_'.$fk;
}
PTDEBUG && _d("Old FK name: $fk New FK name: $new_fk");
$constraint =~ s/CONSTRAINT `$fk`/CONSTRAINT `$new_fk`/;
my $sql = "DROP FOREIGN KEY `$fk`, "
. "ADD $constraint";

101
t/pt-online-schema-change/rename_fk_constraints.t Normal file
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@@ -0,0 +1,101 @@
#!/usr/bin/env perl
BEGIN {
die "The PERCONA_TOOLKIT_BRANCH environment variable is not set.\n"
unless $ENV{PERCONA_TOOLKIT_BRANCH} && -d $ENV{PERCONA_TOOLKIT_BRANCH};
unshift @INC, "$ENV{PERCONA_TOOLKIT_BRANCH}/lib";
};
use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Test::More;
use Data::Dumper;
use PerconaTest;
use Sandbox;
require "$trunk/bin/pt-online-schema-change";
my $dp = new DSNParser(opts=>$dsn_opts);
my $sb = new Sandbox(basedir => '/tmp', DSNParser => $dp);
my $master_dbh = $sb->get_dbh_for('master');
if ( !$master_dbh ) {
plan skip_all => 'Cannot connect to sandbox master';
}
# The sandbox servers run with lock_wait_timeout=3 and it's not dynamic
# so we need to specify --set-vars innodb_lock_wait_timeout-3 else the
# tool will die.
my $master_dsn = 'h=127.1,P=12345,u=msandbox,p=msandbox';
my @args = (qw(--set-vars innodb_lock_wait_timeout=3 --alter-foreign-keys-method rebuild_constraints));
my $output;
my $exit_status;
my $sample = "t/pt-online-schema-change/samples/";
# ############################################################################
# https://bugs.launchpad.net/percona-toolkit/+bug/1215587
# Adding _ to constraints can create issues with constraint name length
# ############################################################################
$sb->load_file('master', "$sample/bug-1215587.sql");
# run once: we expect constraint names to be prefixed with one underscore
# note: We're running just a neutral no-op alter. We are only interested in constraint name
# changes.
($output, $exit_status) = full_output(
sub { pt_online_schema_change::main(@args,
"$master_dsn,D=bug1215587,t=Table1",
"--alter", "ENGINE=InnoDB",
qw(--execute)) },
);
my $constraints = $master_dbh->selectall_hashref("SELECT CONSTRAINT_NAME, TABLE_NAME FROM information_schema.KEY_COLUMN_USAGE WHERE table_schema='bug1215587' and (TABLE_NAME='Table1' OR TABLE_NAME='Table2') and CONSTRAINT_NAME LIKE '%fkey%'", 'table_name');
is(
$constraints->{Table1}->{constraint_name},
'_fkey1',
"Altered table: constraint name prefixed one underscore after 1st run"
);
is(
$constraints->{Table2}->{constraint_name},
'_fkey2',
"Child table : constraint name prefixed one underscore after 1st run"
);
# run second time
# we expect underscores to be removed
($output, $exit_status) = full_output(
sub { pt_online_schema_change::main(@args,
"$master_dsn,D=bug1215587,t=Table1",
"--alter", "ENGINE=InnoDB",
qw(--execute)) },
);
$constraints = $master_dbh->selectall_hashref("SELECT CONSTRAINT_NAME, TABLE_NAME FROM information_schema.KEY_COLUMN_USAGE WHERE table_schema='bug1215587' and (TABLE_NAME='Table1' OR TABLE_NAME='Table2') and CONSTRAINT_NAME LIKE '%fkey%'", 'table_name');
is(
$constraints->{'Table1'}->{constraint_name},
'fkey1',
"Altered table: constraint name removed underscore after 2nd run"
);
is(
$constraints->{'Table2'}->{constraint_name},
'fkey2',
"Child table : constraint name removed underscore after 2nd run"
);
# #############################################################################
# Done.
# #############################################################################
$sb->wipe_clean($master_dbh);
ok($sb->ok(), "Sandbox servers") or BAIL_OUT(__FILE__ . " broke the sandbox");
done_testing;

23
t/pt-online-schema-change/samples/bug-1215587.sql Normal file
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@@ -0,0 +1,23 @@
/* ----- Create two test tables with FKs for scenario 1 and 2: ----- */
drop database if exists bug1215587;
CREATE DATABASE bug1215587;
USE bug1215587;
CREATE TABLE IF NOT EXISTS `Table1` (
`ID` int unsigned NOT NULL AUTO_INCREMENT,
`T2ID` smallint unsigned DEFAULT NULL,
PRIMARY KEY (`ID`),
KEY `tagIndex` (`T2ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE `Table2` (
`ID` smallint unsigned NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
ALTER TABLE `Table1`
ADD CONSTRAINT `fkey1` FOREIGN KEY (`T2ID`) REFERENCES `Table2` (`ID`) ON DELETE NO ACTION;
ALTER TABLE `Table2`
ADD CONSTRAINT `fkey2` FOREIGN KEY (`ID`) REFERENCES `Table1` (`T2ID`) ON DELETE NO ACTION;