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marsadm: prevent only _new_ split brains

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Thomas Schoebel-Theuer 2014-02-26 10:55:06 +01:00 committed by Thomas Schoebel-Theuer
parent e78d0a3078
commit a16875fcfe
1 changed files with 13 additions and 0 deletions
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userspace/marsadm
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@ -618,8 +618,12 @@ sub get_common_ancestor {
return _get_common_ancestor($basedir, $repl1, $host1, 0, $repl2, $host2, 0);
}
my %detected_splits = ();
sub detect_splitbrain {
my ($res, $do_report) = @_;
# dynamic programming
return $detected_splits{$res} if defined($detected_splits{$res});
my $basedir = "$mars/resource-$res";
my $ok = 1;
my @list = glob("$mars/resource-$res/replay-*");
@ -638,6 +642,7 @@ sub detect_splitbrain {
}
}
}
$detected_splits{$res} = $ok;
return $ok;
}
@ -698,6 +703,14 @@ sub log_purge_res {
sub try_to_avoid_splitbrain {
my ($cmd, $res) = @_;
if (!detect_splitbrain($res, 0)) {
lwarn "ATTENTION: you are starting a non-forced primary switchover in a split brain situation.\n";
lwarn "ATTENTION: that's no good idea.\n";
lwarn "ATTENTION: I will continue to do what you want.\n";
lwarn "ATTENTION: But you are responsible for the consequences.\n";
return;
}
# now try to prevent producing a _new_ split brain situation....
my ($min, $max) = get_minmax_versions($res);
my @host_list = glob("$mars/resource-$res/replay-*");
return if scalar(@host_list) < 2;