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marsadm: different purge method for deleted peer symlinks

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Thomas Schoebel-Theuer 2022-02-08 16:29:04 +01:00 committed by Thomas Schoebel-Theuer
parent 2fd4a64b61
commit 05141a071b
1 changed files with 24 additions and 0 deletions
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userspace/marsadm
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@ -5888,10 +5888,34 @@ sub link_purge_global {
return if $purged_globally++;
my $start_time = mars_time();
my $min_time = _get_min_time($start_time, "*");
# new deletion method
my $clean_glob = "$mars/{,*/}{.*,*}";
_purge_dot_deleted($clean_glob, $min_time);
# SAFEGUARD, careful: /mars/ips/ does not depend on resources.
# It belongs to cluster level, not to resource level.
# However, even at cluster level, there are subtle distinctions:
# I cannot assume that removal of a peer is a "temporary" removal.
# At least, the current version of MARS does not support a "temporary"
# removal, because this would induce a _plethora_ of further changes to
# many reports / commands / interfaces / etc etc.
# Thus we _cannot_ use the _get_min_time() protection against dead / decommissioned
# peers here, UNFORTUNATLY :(
# Reason: this protection can only protect at more fine-grained layers, but it
# cannot protect the _base_ of all of this.
# Example: if you destroy the _foundation_ of a building, you have agreed to
# destruction of the _whole_ building.
# For _some_ heuristic safety against _accidental_ destruction of the foundations
# of the Distributed System: solely rely on $keep_backup_hours here,
# but I cannot rely on non-brokenness == aliveness of connections (otherwise the
# logically destroyed symlinks would NEVER disappear fully).
my $safe_clean_glob = "/mars/ips/ip-*";
my $safe_purge_time = $start_time - 3600 * $keep_backup_hours;
_purge_dot_deleted($safe_clean_glob, $safe_purge_time);
# old deletion method
# DEPRECATED, to DISAPPEAR (hopefully in a few years)
my $del_glob = "$mars/{,*/}{.tmp,.deleted,delete,work}-*";
my $msg_glob = "$mars/actual-*/msg-*";
_compat_purge_deleted($del_glob, $msg_glob);