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light: less side effects by emergency mode

This commit is contained in:
Thomas Schoebel-Theuer 2015-02-09 13:42:43 +01:00
parent c81ad56480
commit 092201decc
2 changed files with 18 additions and 45 deletions
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45
docu/mars-manual.lyx
View File

@ -13148,10 +13148,7 @@ status open
\begin_inset Newline newline
\end_inset
all locally secondary resources will stop fetching transaction logfiles.
As a side effect, other nodes in the cluster may become unable to delete
their logfiles also.
This is a desperate action of the kernel module.
a warning will be issued.
\end_layout
\begin_layout Enumerate
@ -13204,9 +13201,9 @@ status open
\begin_inset Newline newline
\end_inset
all locally secondary resources will start removing any logfiles which are
no longer used locally.
This is a more desperate action of the kernel module.
all locally secondary resources will delete local copies of transaction
logfiles which are no longer needed locally.
This is a desperate action of the kernel module.
\end_layout
\begin_layout Enumerate
@ -13244,41 +13241,13 @@ status open
\begin_inset Newline newline
\end_inset
all locally primary resources are checked for logfiles which are no longer
needed
\emph on
locally
\emph default
.
Locally unneeded files are deleted even when some secondary needs them.
As a consequence, some secondaries may get stuck (left in consistent, but
outdated state).
In order to get them actual again, they will need a
\family typewriter
marsadm invalidate
\family default
later (if there is no split brain; otherwise you might need the
\family typewriter
leave-resource
\family default
;
\family typewriter
join-resource
\family default
method from section
\begin_inset CommandInset ref
LatexCommand ref
reference "sub:Split-Brain-Resolution"
\end_inset
).
This is an even more desperate action of the kernel module.
all locally secondary resources will stop fetching transaction logfiles.
This is a more desperate action of the kernel module.
You don't want to get there (except for testing).
\end_layout
\begin_layout Enumerate
Last desperate kernelspace action when all other has failed and
Last desperate kernelspace action when all else has failed and
\family typewriter
\begin_inset Flex URL

18
kernel/sy_old/mars_light.c
View File

@ -1530,7 +1530,7 @@ int __make_copy(
cc.fullpath[1],
(const struct generic_brick_type*)&copy_brick_type,
(const struct generic_brick_type*[]){NULL,NULL,NULL,NULL},
(!switch_copy || (IS_EXHAUSTED() && !space_using_mode) || IS_EMERGENCY_PRIMARY()) ? -1 : 2,
(!switch_copy || (IS_EMERGENCY_PRIMARY() && !space_using_mode)) ? -1 : 2,
"%s",
(const char *[]){"%s", "%s", "%s", "%s"},
4,
@ -3563,23 +3563,27 @@ int make_log_finalize(struct mars_global *global, struct mars_dent *dent)
rot->created_hole = false;
}
if (IS_EMERGENCY_PRIMARY() || (!rot->todo_primary && IS_EMERGENCY_SECONDARY())) {
MARS_WRN_TO(rot->log_say, "EMERGENCY: the space on /mars/ is very low. Expect some problems!\n");
if (rot->first_log && rot->first_log != rot->relevant_log) {
if (IS_EMERGENCY_SECONDARY()) {
if (!rot->todo_primary && rot->first_log && rot->first_log != rot->relevant_log) {
MARS_WRN_TO(rot->log_say, "EMERGENCY: ruthlessly freeing old logfile '%s', don't cry on any ramifications.\n", rot->first_log->d_path);
make_rot_msg(rot, "wrn-space-low", "EMERGENCY: ruthlessly freeing old logfile '%s'", rot->first_log->d_path);
mars_unlink(rot->first_log->d_path);
rot->first_log->d_killme = true;
// give it a chance to cease deleting next time
compute_emergency_mode();
} else if (IS_EMERGENCY_PRIMARY()) {
MARS_WRN_TO(rot->log_say, "EMERGENCY: the space on /mars/ is VERY low.\n");
make_rot_msg(rot, "wrn-space-low", "EMERGENCY: the space on /mars/ is VERY low.");
} else {
make_rot_msg(rot, "wrn-space-low", "EMERGENCY: the space on /mars/ is very low. Expect some problems!");
MARS_WRN_TO(rot->log_say, "EMERGENCY: the space on /mars/ is low.\n");
make_rot_msg(rot, "wrn-space-low", "EMERGENCY: the space on /mars/ is low.");
}
} else if (IS_EXHAUSTED()) {
MARS_WRN_TO(rot->log_say, "EMERGENCY: the space on /mars/ is becoming low. Stopping all fetches of logfiles for secondary resources.\n");
make_rot_msg(rot, "wrn-space-low", "EMERGENCY: the space on /mars/ is becoming low. Stopping all fetches of logfiles for secondary resources.");
MARS_WRN_TO(rot->log_say, "EMERGENCY: the space on /mars/ is becoming low.\n");
make_rot_msg(rot, "wrn-space-low", "EMERGENCY: the space on /mars/ is becoming low.");
}
if (trans_brick->replay_mode) {
if (trans_brick->replay_code > 0) {
MARS_INF_TO(rot->log_say, "logfile replay ended successfully at position %lld\n", trans_brick->replay_current_pos);