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CTDB should warn by default if too much system memory or swap is used.
The tests have also been tweaked. In particular, the filesystem-only
tests need to initialise the memory information to avoid errors where
meminfo isn't set.
Document the defaults, warning against disabling them.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Marking the node unhealthy should cause Samba processes to close,
possible freeing a stack of memory. If not, then it is somebody
else's problem.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
New variables CTDB_MONITOR_MEMORY_USAGE and CTDB_MONITOR_SWAP_USAGE.
Both take a pair of <warn_threshold>:<unhealthy_threshold> where each
theshold is specified as a percentage.
This adds a callout to check_thresholds() that is run when the
unhealthy threshold is reached.
Add some combination tests.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
CTDB_MONITOR_FREE_MEMORY and CTDB_MONITOR_FREE_MEMORY_WARN are now
percentages that specify thresholds of acceptable memory usage.
Memory/swap usage in tests also specified as percentages.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
