Test and fix typo in MasterSlave.pm and update that module in all tools.

bin/pt-archiver

@@ -2725,6 +2725,54 @@ sub new {
    return bless $self, $class;
 }
 
+sub get_slaves {
+   my ($self, %args) = @_;
+   my @required_args = qw(make_cxn OptionParser DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($make_cxn, $o, $dp) = @args{@required_args};
+
+   my $slaves = [];
+   my $method = $o->get('recursion-method');
+   PTDEBUG && _d('Slave recursion method:', $method);
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
+      my @required_args = qw(dbh dsn);
+      foreach my $arg ( @required_args ) {
+         die "I need a $arg argument" unless $args{$arg};
+      }
+      my ($dbh, $dsn) = @args{@required_args};
+      $self->recurse_to_slaves(
+         {  dbh        => $dbh,
+            dsn        => $dsn,
+            dsn_parser => $dp,
+            recurse    => $o->get('recurse'),
+            method     => $o->get('recursion-method'),
+            callback   => sub {
+               my ( $dsn, $dbh, $level, $parent ) = @_;
+               return unless $level;
+               PTDEBUG && _d('Found slave:', $dp->as_string($dsn));
+               push @$slaves, $make_cxn->(dsn => $dsn, dbh => $dbh);
+               return;
+            },
+         }
+      );
+   }
+   elsif ( $method =~ m/^dsn=/i ) {
+      my ($dsn_table_dsn) = $method =~ m/^dsn=(.+)/i;
+      $slaves = $self->get_cxn_from_dsn_table(
+         %args,
+         dsn_table_dsn => $dsn_table_dsn,
+      );
+   }
+   else {
+      die "Invalid --recursion-method: $method.  Valid values are: "
+        . "dsn=DSN, hosts, or processlist.\n";
+   }
+
+   return $slaves;
+}
+
 sub recurse_to_slaves {
    my ( $self, $args, $level ) = @_;
    $level ||= 0;
@@ -3301,6 +3349,43 @@ sub reset_known_replication_threads {
    return;
 }
 
+sub get_cxn_from_dsn_table {
+   my ($self, %args) = @_;
+   my @required_args = qw(dsn_table_dsn make_cxn DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($dsn_table_dsn, $make_cxn, $dp, $q) = @args{@required_args};
+   PTDEBUG && _d('DSN table DSN:', $dsn_table_dsn);
+
+   my $dsn = $dp->parse($dsn_table_dsn);
+   my $dsn_table;
+   if ( $dsn->{D} && $dsn->{t} ) {
+      $dsn_table = $q->quote($dsn->{D}, $dsn->{t});
+   }
+   elsif ( $dsn->{t} && $dsn->{t} =~ m/\./ ) {
+      $dsn_table = $q->quote($q->split_unquote($dsn->{t}));
+   }
+   else {
+      die "DSN table DSN does not specify a database (D) "
+        . "or a database-qualified table (t)";
+   }
+
+   my $dsn_tbl_cxn = $make_cxn->(dsn => $dsn);
+   my $dbh         = $dsn_tbl_cxn->connect();
+   my $sql         = "SELECT dsn FROM $dsn_table ORDER BY id";
+   PTDEBUG && _d($sql);
+   my $dsn_strings = $dbh->selectcol_arrayref($sql);
+   my @cxn;
+   if ( $dsn_strings ) {
+      foreach my $dsn_string ( @$dsn_strings ) {
+         PTDEBUG && _d('DSN from DSN table:', $dsn_string);
+         push @cxn, $make_cxn->(dsn_string => $dsn_string);
+      }
+   }
+   return \@cxn;
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

bin/pt-heartbeat

@@ -33,6 +33,54 @@ sub new {
    return bless $self, $class;
 }
 
+sub get_slaves {
+   my ($self, %args) = @_;
+   my @required_args = qw(make_cxn OptionParser DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($make_cxn, $o, $dp) = @args{@required_args};
+
+   my $slaves = [];
+   my $method = $o->get('recursion-method');
+   PTDEBUG && _d('Slave recursion method:', $method);
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
+      my @required_args = qw(dbh dsn);
+      foreach my $arg ( @required_args ) {
+         die "I need a $arg argument" unless $args{$arg};
+      }
+      my ($dbh, $dsn) = @args{@required_args};
+      $self->recurse_to_slaves(
+         {  dbh        => $dbh,
+            dsn        => $dsn,
+            dsn_parser => $dp,
+            recurse    => $o->get('recurse'),
+            method     => $o->get('recursion-method'),
+            callback   => sub {
+               my ( $dsn, $dbh, $level, $parent ) = @_;
+               return unless $level;
+               PTDEBUG && _d('Found slave:', $dp->as_string($dsn));
+               push @$slaves, $make_cxn->(dsn => $dsn, dbh => $dbh);
+               return;
+            },
+         }
+      );
+   }
+   elsif ( $method =~ m/^dsn=/i ) {
+      my ($dsn_table_dsn) = $method =~ m/^dsn=(.+)/i;
+      $slaves = $self->get_cxn_from_dsn_table(
+         %args,
+         dsn_table_dsn => $dsn_table_dsn,
+      );
+   }
+   else {
+      die "Invalid --recursion-method: $method.  Valid values are: "
+        . "dsn=DSN, hosts, or processlist.\n";
+   }
+
+   return $slaves;
+}
+
 sub recurse_to_slaves {
    my ( $self, $args, $level ) = @_;
    $level ||= 0;
@@ -609,6 +657,43 @@ sub reset_known_replication_threads {
    return;
 }
 
+sub get_cxn_from_dsn_table {
+   my ($self, %args) = @_;
+   my @required_args = qw(dsn_table_dsn make_cxn DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($dsn_table_dsn, $make_cxn, $dp, $q) = @args{@required_args};
+   PTDEBUG && _d('DSN table DSN:', $dsn_table_dsn);
+
+   my $dsn = $dp->parse($dsn_table_dsn);
+   my $dsn_table;
+   if ( $dsn->{D} && $dsn->{t} ) {
+      $dsn_table = $q->quote($dsn->{D}, $dsn->{t});
+   }
+   elsif ( $dsn->{t} && $dsn->{t} =~ m/\./ ) {
+      $dsn_table = $q->quote($q->split_unquote($dsn->{t}));
+   }
+   else {
+      die "DSN table DSN does not specify a database (D) "
+        . "or a database-qualified table (t)";
+   }
+
+   my $dsn_tbl_cxn = $make_cxn->(dsn => $dsn);
+   my $dbh         = $dsn_tbl_cxn->connect();
+   my $sql         = "SELECT dsn FROM $dsn_table ORDER BY id";
+   PTDEBUG && _d($sql);
+   my $dsn_strings = $dbh->selectcol_arrayref($sql);
+   my @cxn;
+   if ( $dsn_strings ) {
+      foreach my $dsn_string ( @$dsn_strings ) {
+         PTDEBUG && _d('DSN from DSN table:', $dsn_string);
+         push @cxn, $make_cxn->(dsn_string => $dsn_string);
+      }
+   }
+   return \@cxn;
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

bin/pt-kill

@@ -2437,6 +2437,54 @@ sub new {
    return bless $self, $class;
 }
 
+sub get_slaves {
+   my ($self, %args) = @_;
+   my @required_args = qw(make_cxn OptionParser DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($make_cxn, $o, $dp) = @args{@required_args};
+
+   my $slaves = [];
+   my $method = $o->get('recursion-method');
+   PTDEBUG && _d('Slave recursion method:', $method);
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
+      my @required_args = qw(dbh dsn);
+      foreach my $arg ( @required_args ) {
+         die "I need a $arg argument" unless $args{$arg};
+      }
+      my ($dbh, $dsn) = @args{@required_args};
+      $self->recurse_to_slaves(
+         {  dbh        => $dbh,
+            dsn        => $dsn,
+            dsn_parser => $dp,
+            recurse    => $o->get('recurse'),
+            method     => $o->get('recursion-method'),
+            callback   => sub {
+               my ( $dsn, $dbh, $level, $parent ) = @_;
+               return unless $level;
+               PTDEBUG && _d('Found slave:', $dp->as_string($dsn));
+               push @$slaves, $make_cxn->(dsn => $dsn, dbh => $dbh);
+               return;
+            },
+         }
+      );
+   }
+   elsif ( $method =~ m/^dsn=/i ) {
+      my ($dsn_table_dsn) = $method =~ m/^dsn=(.+)/i;
+      $slaves = $self->get_cxn_from_dsn_table(
+         %args,
+         dsn_table_dsn => $dsn_table_dsn,
+      );
+   }
+   else {
+      die "Invalid --recursion-method: $method.  Valid values are: "
+        . "dsn=DSN, hosts, or processlist.\n";
+   }
+
+   return $slaves;
+}
+
 sub recurse_to_slaves {
    my ( $self, $args, $level ) = @_;
    $level ||= 0;
@@ -3013,6 +3061,43 @@ sub reset_known_replication_threads {
    return;
 }
 
+sub get_cxn_from_dsn_table {
+   my ($self, %args) = @_;
+   my @required_args = qw(dsn_table_dsn make_cxn DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($dsn_table_dsn, $make_cxn, $dp, $q) = @args{@required_args};
+   PTDEBUG && _d('DSN table DSN:', $dsn_table_dsn);
+
+   my $dsn = $dp->parse($dsn_table_dsn);
+   my $dsn_table;
+   if ( $dsn->{D} && $dsn->{t} ) {
+      $dsn_table = $q->quote($dsn->{D}, $dsn->{t});
+   }
+   elsif ( $dsn->{t} && $dsn->{t} =~ m/\./ ) {
+      $dsn_table = $q->quote($q->split_unquote($dsn->{t}));
+   }
+   else {
+      die "DSN table DSN does not specify a database (D) "
+        . "or a database-qualified table (t)";
+   }
+
+   my $dsn_tbl_cxn = $make_cxn->(dsn => $dsn);
+   my $dbh         = $dsn_tbl_cxn->connect();
+   my $sql         = "SELECT dsn FROM $dsn_table ORDER BY id";
+   PTDEBUG && _d($sql);
+   my $dsn_strings = $dbh->selectcol_arrayref($sql);
+   my @cxn;
+   if ( $dsn_strings ) {
+      foreach my $dsn_string ( @$dsn_strings ) {
+         PTDEBUG && _d('DSN from DSN table:', $dsn_string);
+         push @cxn, $make_cxn->(dsn_string => $dsn_string);
+      }
+   }
+   return \@cxn;
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

bin/pt-query-digest

@@ -10441,6 +10441,54 @@ sub new {
    return bless $self, $class;
 }
 
+sub get_slaves {
+   my ($self, %args) = @_;
+   my @required_args = qw(make_cxn OptionParser DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($make_cxn, $o, $dp) = @args{@required_args};
+
+   my $slaves = [];
+   my $method = $o->get('recursion-method');
+   PTDEBUG && _d('Slave recursion method:', $method);
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
+      my @required_args = qw(dbh dsn);
+      foreach my $arg ( @required_args ) {
+         die "I need a $arg argument" unless $args{$arg};
+      }
+      my ($dbh, $dsn) = @args{@required_args};
+      $self->recurse_to_slaves(
+         {  dbh        => $dbh,
+            dsn        => $dsn,
+            dsn_parser => $dp,
+            recurse    => $o->get('recurse'),
+            method     => $o->get('recursion-method'),
+            callback   => sub {
+               my ( $dsn, $dbh, $level, $parent ) = @_;
+               return unless $level;
+               PTDEBUG && _d('Found slave:', $dp->as_string($dsn));
+               push @$slaves, $make_cxn->(dsn => $dsn, dbh => $dbh);
+               return;
+            },
+         }
+      );
+   }
+   elsif ( $method =~ m/^dsn=/i ) {
+      my ($dsn_table_dsn) = $method =~ m/^dsn=(.+)/i;
+      $slaves = $self->get_cxn_from_dsn_table(
+         %args,
+         dsn_table_dsn => $dsn_table_dsn,
+      );
+   }
+   else {
+      die "Invalid --recursion-method: $method.  Valid values are: "
+        . "dsn=DSN, hosts, or processlist.\n";
+   }
+
+   return $slaves;
+}
+
 sub recurse_to_slaves {
    my ( $self, $args, $level ) = @_;
    $level ||= 0;
@@ -11017,6 +11065,43 @@ sub reset_known_replication_threads {
    return;
 }
 
+sub get_cxn_from_dsn_table {
+   my ($self, %args) = @_;
+   my @required_args = qw(dsn_table_dsn make_cxn DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($dsn_table_dsn, $make_cxn, $dp, $q) = @args{@required_args};
+   PTDEBUG && _d('DSN table DSN:', $dsn_table_dsn);
+
+   my $dsn = $dp->parse($dsn_table_dsn);
+   my $dsn_table;
+   if ( $dsn->{D} && $dsn->{t} ) {
+      $dsn_table = $q->quote($dsn->{D}, $dsn->{t});
+   }
+   elsif ( $dsn->{t} && $dsn->{t} =~ m/\./ ) {
+      $dsn_table = $q->quote($q->split_unquote($dsn->{t}));
+   }
+   else {
+      die "DSN table DSN does not specify a database (D) "
+        . "or a database-qualified table (t)";
+   }
+
+   my $dsn_tbl_cxn = $make_cxn->(dsn => $dsn);
+   my $dbh         = $dsn_tbl_cxn->connect();
+   my $sql         = "SELECT dsn FROM $dsn_table ORDER BY id";
+   PTDEBUG && _d($sql);
+   my $dsn_strings = $dbh->selectcol_arrayref($sql);
+   my @cxn;
+   if ( $dsn_strings ) {
+      foreach my $dsn_string ( @$dsn_strings ) {
+         PTDEBUG && _d('DSN from DSN table:', $dsn_string);
+         push @cxn, $make_cxn->(dsn_string => $dsn_string);
+      }
+   }
+   return \@cxn;
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

bin/pt-slave-find

@@ -1414,6 +1414,54 @@ sub new {
    return bless $self, $class;
 }
 
+sub get_slaves {
+   my ($self, %args) = @_;
+   my @required_args = qw(make_cxn OptionParser DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($make_cxn, $o, $dp) = @args{@required_args};
+
+   my $slaves = [];
+   my $method = $o->get('recursion-method');
+   PTDEBUG && _d('Slave recursion method:', $method);
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
+      my @required_args = qw(dbh dsn);
+      foreach my $arg ( @required_args ) {
+         die "I need a $arg argument" unless $args{$arg};
+      }
+      my ($dbh, $dsn) = @args{@required_args};
+      $self->recurse_to_slaves(
+         {  dbh        => $dbh,
+            dsn        => $dsn,
+            dsn_parser => $dp,
+            recurse    => $o->get('recurse'),
+            method     => $o->get('recursion-method'),
+            callback   => sub {
+               my ( $dsn, $dbh, $level, $parent ) = @_;
+               return unless $level;
+               PTDEBUG && _d('Found slave:', $dp->as_string($dsn));
+               push @$slaves, $make_cxn->(dsn => $dsn, dbh => $dbh);
+               return;
+            },
+         }
+      );
+   }
+   elsif ( $method =~ m/^dsn=/i ) {
+      my ($dsn_table_dsn) = $method =~ m/^dsn=(.+)/i;
+      $slaves = $self->get_cxn_from_dsn_table(
+         %args,
+         dsn_table_dsn => $dsn_table_dsn,
+      );
+   }
+   else {
+      die "Invalid --recursion-method: $method.  Valid values are: "
+        . "dsn=DSN, hosts, or processlist.\n";
+   }
+
+   return $slaves;
+}
+
 sub recurse_to_slaves {
    my ( $self, $args, $level ) = @_;
    $level ||= 0;
@@ -1990,6 +2038,43 @@ sub reset_known_replication_threads {
    return;
 }
 
+sub get_cxn_from_dsn_table {
+   my ($self, %args) = @_;
+   my @required_args = qw(dsn_table_dsn make_cxn DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($dsn_table_dsn, $make_cxn, $dp, $q) = @args{@required_args};
+   PTDEBUG && _d('DSN table DSN:', $dsn_table_dsn);
+
+   my $dsn = $dp->parse($dsn_table_dsn);
+   my $dsn_table;
+   if ( $dsn->{D} && $dsn->{t} ) {
+      $dsn_table = $q->quote($dsn->{D}, $dsn->{t});
+   }
+   elsif ( $dsn->{t} && $dsn->{t} =~ m/\./ ) {
+      $dsn_table = $q->quote($q->split_unquote($dsn->{t}));
+   }
+   else {
+      die "DSN table DSN does not specify a database (D) "
+        . "or a database-qualified table (t)";
+   }
+
+   my $dsn_tbl_cxn = $make_cxn->(dsn => $dsn);
+   my $dbh         = $dsn_tbl_cxn->connect();
+   my $sql         = "SELECT dsn FROM $dsn_table ORDER BY id";
+   PTDEBUG && _d($sql);
+   my $dsn_strings = $dbh->selectcol_arrayref($sql);
+   my @cxn;
+   if ( $dsn_strings ) {
+      foreach my $dsn_string ( @$dsn_strings ) {
+         PTDEBUG && _d('DSN from DSN table:', $dsn_string);
+         push @cxn, $make_cxn->(dsn_string => $dsn_string);
+      }
+   }
+   return \@cxn;
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

bin/pt-slave-restart

@@ -1574,6 +1574,54 @@ sub new {
    return bless $self, $class;
 }
 
+sub get_slaves {
+   my ($self, %args) = @_;
+   my @required_args = qw(make_cxn OptionParser DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($make_cxn, $o, $dp) = @args{@required_args};
+
+   my $slaves = [];
+   my $method = $o->get('recursion-method');
+   PTDEBUG && _d('Slave recursion method:', $method);
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
+      my @required_args = qw(dbh dsn);
+      foreach my $arg ( @required_args ) {
+         die "I need a $arg argument" unless $args{$arg};
+      }
+      my ($dbh, $dsn) = @args{@required_args};
+      $self->recurse_to_slaves(
+         {  dbh        => $dbh,
+            dsn        => $dsn,
+            dsn_parser => $dp,
+            recurse    => $o->get('recurse'),
+            method     => $o->get('recursion-method'),
+            callback   => sub {
+               my ( $dsn, $dbh, $level, $parent ) = @_;
+               return unless $level;
+               PTDEBUG && _d('Found slave:', $dp->as_string($dsn));
+               push @$slaves, $make_cxn->(dsn => $dsn, dbh => $dbh);
+               return;
+            },
+         }
+      );
+   }
+   elsif ( $method =~ m/^dsn=/i ) {
+      my ($dsn_table_dsn) = $method =~ m/^dsn=(.+)/i;
+      $slaves = $self->get_cxn_from_dsn_table(
+         %args,
+         dsn_table_dsn => $dsn_table_dsn,
+      );
+   }
+   else {
+      die "Invalid --recursion-method: $method.  Valid values are: "
+        . "dsn=DSN, hosts, or processlist.\n";
+   }
+
+   return $slaves;
+}
+
 sub recurse_to_slaves {
    my ( $self, $args, $level ) = @_;
    $level ||= 0;
@@ -2150,6 +2198,43 @@ sub reset_known_replication_threads {
    return;
 }
 
+sub get_cxn_from_dsn_table {
+   my ($self, %args) = @_;
+   my @required_args = qw(dsn_table_dsn make_cxn DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($dsn_table_dsn, $make_cxn, $dp, $q) = @args{@required_args};
+   PTDEBUG && _d('DSN table DSN:', $dsn_table_dsn);
+
+   my $dsn = $dp->parse($dsn_table_dsn);
+   my $dsn_table;
+   if ( $dsn->{D} && $dsn->{t} ) {
+      $dsn_table = $q->quote($dsn->{D}, $dsn->{t});
+   }
+   elsif ( $dsn->{t} && $dsn->{t} =~ m/\./ ) {
+      $dsn_table = $q->quote($q->split_unquote($dsn->{t}));
+   }
+   else {
+      die "DSN table DSN does not specify a database (D) "
+        . "or a database-qualified table (t)";
+   }
+
+   my $dsn_tbl_cxn = $make_cxn->(dsn => $dsn);
+   my $dbh         = $dsn_tbl_cxn->connect();
+   my $sql         = "SELECT dsn FROM $dsn_table ORDER BY id";
+   PTDEBUG && _d($sql);
+   my $dsn_strings = $dbh->selectcol_arrayref($sql);
+   my @cxn;
+   if ( $dsn_strings ) {
+      foreach my $dsn_string ( @$dsn_strings ) {
+         PTDEBUG && _d('DSN from DSN table:', $dsn_string);
+         push @cxn, $make_cxn->(dsn_string => $dsn_string);
+      }
+   }
+   return \@cxn;
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

bin/pt-table-checksum

@@ -2454,7 +2454,7 @@ sub get_slaves {
    my $slaves = [];
    my $method = $o->get('recursion-method');
    PTDEBUG && _d('Slave recursion method:', $method);
-   if ( !$method || $method =~ m/proocesslist|hosts/i ) {
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
       my @required_args = qw(dbh dsn);
       foreach my $arg ( @required_args ) {
          die "I need a $arg argument" unless $args{$arg};
@@ -2484,7 +2484,7 @@ sub get_slaves {
       );
    }
    else {
-      die "Invalid --recusion-method: $method.  Valid values are: "
+      die "Invalid --recursion-method: $method.  Valid values are: "
         . "dsn=DSN, hosts, or processlist.\n";
    }
 

bin/pt-table-sync

@@ -5856,6 +5856,54 @@ sub new {
    return bless $self, $class;
 }
 
+sub get_slaves {
+   my ($self, %args) = @_;
+   my @required_args = qw(make_cxn OptionParser DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($make_cxn, $o, $dp) = @args{@required_args};
+
+   my $slaves = [];
+   my $method = $o->get('recursion-method');
+   PTDEBUG && _d('Slave recursion method:', $method);
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
+      my @required_args = qw(dbh dsn);
+      foreach my $arg ( @required_args ) {
+         die "I need a $arg argument" unless $args{$arg};
+      }
+      my ($dbh, $dsn) = @args{@required_args};
+      $self->recurse_to_slaves(
+         {  dbh        => $dbh,
+            dsn        => $dsn,
+            dsn_parser => $dp,
+            recurse    => $o->get('recurse'),
+            method     => $o->get('recursion-method'),
+            callback   => sub {
+               my ( $dsn, $dbh, $level, $parent ) = @_;
+               return unless $level;
+               PTDEBUG && _d('Found slave:', $dp->as_string($dsn));
+               push @$slaves, $make_cxn->(dsn => $dsn, dbh => $dbh);
+               return;
+            },
+         }
+      );
+   }
+   elsif ( $method =~ m/^dsn=/i ) {
+      my ($dsn_table_dsn) = $method =~ m/^dsn=(.+)/i;
+      $slaves = $self->get_cxn_from_dsn_table(
+         %args,
+         dsn_table_dsn => $dsn_table_dsn,
+      );
+   }
+   else {
+      die "Invalid --recursion-method: $method.  Valid values are: "
+        . "dsn=DSN, hosts, or processlist.\n";
+   }
+
+   return $slaves;
+}
+
 sub recurse_to_slaves {
    my ( $self, $args, $level ) = @_;
    $level ||= 0;
@@ -6432,6 +6480,43 @@ sub reset_known_replication_threads {
    return;
 }
 
+sub get_cxn_from_dsn_table {
+   my ($self, %args) = @_;
+   my @required_args = qw(dsn_table_dsn make_cxn DSNParser Quoter);
+   foreach my $arg ( @required_args ) {
+      die "I need a $arg argument" unless $args{$arg};
+   }
+   my ($dsn_table_dsn, $make_cxn, $dp, $q) = @args{@required_args};
+   PTDEBUG && _d('DSN table DSN:', $dsn_table_dsn);
+
+   my $dsn = $dp->parse($dsn_table_dsn);
+   my $dsn_table;
+   if ( $dsn->{D} && $dsn->{t} ) {
+      $dsn_table = $q->quote($dsn->{D}, $dsn->{t});
+   }
+   elsif ( $dsn->{t} && $dsn->{t} =~ m/\./ ) {
+      $dsn_table = $q->quote($q->split_unquote($dsn->{t}));
+   }
+   else {
+      die "DSN table DSN does not specify a database (D) "
+        . "or a database-qualified table (t)";
+   }
+
+   my $dsn_tbl_cxn = $make_cxn->(dsn => $dsn);
+   my $dbh         = $dsn_tbl_cxn->connect();
+   my $sql         = "SELECT dsn FROM $dsn_table ORDER BY id";
+   PTDEBUG && _d($sql);
+   my $dsn_strings = $dbh->selectcol_arrayref($sql);
+   my @cxn;
+   if ( $dsn_strings ) {
+      foreach my $dsn_string ( @$dsn_strings ) {
+         PTDEBUG && _d('DSN from DSN table:', $dsn_string);
+         push @cxn, $make_cxn->(dsn_string => $dsn_string);
+      }
+   }
+   return \@cxn;
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

lib/MasterSlave.pm

@@ -47,7 +47,7 @@ sub get_slaves {
    my $slaves = [];
    my $method = $o->get('recursion-method');
    PTDEBUG && _d('Slave recursion method:', $method);
-   if ( !$method || $method =~ m/proocesslist|hosts/i ) {
+   if ( !$method || $method =~ m/processlist|hosts/i ) {
       my @required_args = qw(dbh dsn);
       foreach my $arg ( @required_args ) {
          die "I need a $arg argument" unless $args{$arg};
@@ -77,7 +77,7 @@ sub get_slaves {
       );
    }
    else {
-      die "Invalid --recusion-method: $method.  Valid values are: "
+      die "Invalid --recursion-method: $method.  Valid values are: "
         . "dsn=DSN, hosts, or processlist.\n";
    }
 

t/lib/MasterSlave.t

@@ -9,7 +9,7 @@ BEGIN {
 use strict;
 use warnings FATAL => 'all';
 use English qw(-no_match_vars);
-use Test::More tests => 46;
+use Test::More tests => 47;
 
 use MasterSlave;
 use DSNParser;
@@ -28,6 +28,13 @@ my $sb = new Sandbox(basedir => '/tmp', DSNParser => $dp);
 my $master_dbh = $sb->get_dbh_for('master');
 my $slave_dbh  = $sb->get_dbh_for('slave1');
      
+my $master_dsn = {
+   h => '127.1',
+   P => '12345',
+   u => 'msandbox',
+   p => 'msandbox',
+};
+
 # ############################################################################
 # get_slaves() wrapper around recurse_to_slaves()
 # ############################################################################
@@ -42,12 +49,7 @@ SKIP: {
 
    my $slaves = $ms->get_slaves(
       dbh          => $master_dbh,
-      dsn          => {
-         h => '127.1',
-         P => '12345',
-         u => 'msandbox',
-         p => 'msandbox',
-      },
+      dsn          => $master_dsn,
       OptionParser => $o,
       DSNParser    => $dp,
       Quoter       => $q,
@@ -86,6 +88,37 @@ SKIP: {
       '12346',
       'dbh created from get_slaves()'
    );
+
+   # This doesn't actually work because the master and slave are both
+   # localhost/127.1 so it will connect agian to the master, detect this,
+   # and ignore it.  This tests nonetheless that "processlist" isn't
+   # misspelled, which would cause the sub to die.
+   # https://bugs.launchpad.net/percona-toolkit/+bug/921802
+   @ARGV = ('--recursion-method', 'processlist');
+   $o->get_opts();
+
+   $slaves = $ms->get_slaves(
+      OptionParser => $o,
+      DSNParser    => $dp,
+      Quoter       => $q,
+      dbh          => $master_dbh,
+      dsn          => $master_dsn,
+      make_cxn     => sub {
+         my $cxn = new Cxn(
+            @_,
+            DSNParser    => $dp,
+            OptionParser => $o,
+         );
+         $cxn->connect();
+         return $cxn;
+      },
+   );
+
+   is_deeply(
+      $slaves,
+      [],
+      "get_slaves() by processlist"
+   );
 }
 
 # #############################################################################