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marsadm: fetch newest symlinks at join-resource

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Thomas Schoebel-Theuer 2017-06-08 14:03:23 +02:00
parent 12e41def3f
commit 4c74c8e985
1 changed files with 26 additions and 18 deletions
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44
userspace/marsadm
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@ -171,6 +171,7 @@ sub rsync_cmd {
lprint "DRY_RUN: would execute the following command:\n$rsync_cmd\n";
$rsync_cmd .= " --dry-run";
}
finish_links();
# Repeat the action because some symlinks might be updated (or even vanish)
# when the peer is actively running. There seems to exist no rsync option
# for ignoring all of these errors.
@ -1794,27 +1795,34 @@ sub create_res {
ldie "could not create resource '$res'\n" unless -d $resdir;
set_link($size, "$resdir/size");
} else { # join
if (-d $resdir) {
$primary = _get_designated_primary($res, 1);
# For safety, try to get the very newest infos
# For safety, try to get the very newest infos.
# Reason: newer kernel modules will fetch non-member resource infos less frequently.
# Therefore we shift some responsibility for non-member -> member transitions to userspace.
my @peers = map { m:^$mars/ips/ip-(.+):; $1 } glob("$mars/ips/ip-*");
$primary = _get_designated_primary($res, 1);
my $max_retry = 5;
for (;;) {
if ($primary && $primary ne "(none)") {
rsync_cmd("--max-size=1 --update $primary:$mars/resource-$res/ $mars/resource-$res/", 1);
# for safety, fetch newest infos from last known primary
rsync_cmd($primary, "--max-size=1 --update $primary:$mars/resource-$res/ $mars/resource-$res/", $res, 1);
last;
}
if (!@peers || $max_retry < 0) {
lwarn "cannot get a relevant primary";
last;
}
}
if (!-d $resdir || !_get_designated_primary($res, 1)) {
# We are desperate. Try to fetch the directory from anywhere.
my @peers = glob("$mars/ips/ip-*");
my $max_rsync = 3;
foreach my $peer (map { m:^$mars/ips/ip-(.+):; $1 } @peers) {
next if $peer eq $host;
next if $peer eq $real_host;
rsync_cmd($peer, "--max-size=1 --update $peer:$mars/resource-$res/ $mars/resource-$res/", 1);
if (_get_designated_primary($res, 1)) {
last if $max_rsync-- <= 0;
}
}
ldie "resource '$res' does not exist\n" unless -d $resdir;
}
my $peer = shift @peers;
next if $peer eq $host;
next if $peer eq $real_host;
rsync_cmd($peer, "--max-size=1 --update $peer:$mars/resource-$res $mars/", 1);
$primary = _get_designated_primary($res, 1);
$max_retry--;
} # retry loop
ldie "resource '$res' does not exist\n" unless -d $resdir;
ldie "resource '$res' has no designated primary\n" unless $primary && $primary ne "(none)";
finish_links();
wait_cluster($cmd, $res);
my $res_size = get_link("$mars/resource-$res/size", 1);
if ($size < $res_size) {
lwarn "size of new device is only $size, but should be $res_size\n";