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It is unlikely we will need something this verbose for normal troubleshooting.
This allows us to keep a significantly longer time interval of log messages
in the 500k slots available in the ringbuffer.
(This used to be ctdb commit cc99c05c0c6484ad574039a454e6133852cb41fa)
This controls is only used by samba when samba wants to check if a subrecord held by a <node-id>:<smbd-pid> is still valid or if it can be reclaimed.
If the node is banned or stopped, we kill the smbd process and return that the process does not exist to the caller. This allows us to recover subrecords from stopped/banned nodes where smbd is hung waiting for the databases to thaw.
bz58185
(This used to be ctdb commit 157807af72ed4f7314afbc9c19756f9787b92c15)
Add the mapping to the list everytime we accept() a new client connection
and set it up to remove in the destructor when the client structure is freed.
(This used to be ctdb commit f75d379377f5d4abbff2576ddc5d58d91dc53bf4)
Now we're doing checking, we might as well make sure the commands from
"ctdb eventscripts" are valid.
This gets rid of the "UNKNOWN" event type.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 1d24a3869fe89fc9a109fd9e9b69df5fc665a5f6)
Rather than doing strcmp everywhere, pass an explicit enum around. This
also subtly documents what options are available. The "options" arg
is now used for extra arguments only.
Unfortunately, gcc complains on empty format strings, so we make
ctdb_event_script() take no varargs, and add ctdb_event_script_args(). We
leave ctdb_event_script_callback() taking varargs, which means callers
have to do "%s", "".
For the moment, we have CTDB_EVENT_UNKNOWN for handling forced scripts
from the ctdb tool.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 8001488be4f2beb25e943fe01b2afc2e8779930d)
Everyone uses the same timeout value, so just remove it from the API.
If we ever need variable timeouts, that might as well be central too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 533c3e053293941d2a9484b495e78d45f478bb08)
command.
Use the existing context used for non-monitor events
Multiple concurrent uses of "ctdb eventscript ..." could otherwise lead to a SEGV
(This used to be ctdb commit 80a8d728e9680040e00d24361dfc9367dd372a56)
This allows running the actual monitoring asynchronously from ctdbd
and only using "status" to pick up the actual results.
(This used to be ctdb commit 1908bac812650ca25151051f5d86815e0b8ed319)
use a udp socket on the ctdbd port to send messages to teh syslog child process for loggign.
we need this when syslog becomes "slow", like very slow, and on boxes where syslog is limited to 100 lines per second and starts to block after that
(This used to be ctdb commit 1446f4c247310e2ff2d522055bd8927d1a78d017)
Otherwise a node can lock itself out, e.g. when a commit control times out...
Michael
(This used to be ctdb commit cb432e30351d5e5a41e98da3c7b1c2a4d400a3a2)
This aske the daemon wheter a transaction is currently active on a
given DB on that node. More precisely this asks for the transaction_active
flag in the ctdb_db_context that is set in the CTDB_TRANS2_COMMIT
control and cleared in the CTDB_TRANS2_ERROR or CTDB_TRANS2_FINISHED controls.
This will be useful for fixing race conditions in the transaction code.
Michael
(This used to be ctdb commit 8d430ae6968dfe566614379436fc3c56003fcd88)
add a global variable holding the pid of the main daemon.
change the tracking of time() in the event loop to only check/warn when called from the main daemon
(This used to be ctdb commit a10fc51f4c30e85ada6d4b7347b0f9a8ebc76637)
The way to use this is from a client to :
1, first create a message handle and bind it to a SRVID
A special prefix for the srvid space has been set aside for samba :
Only samba is allowed to use srvid's with the top 32 bits set like this.
The lower 32 bits are for samba to use internally.
2, register a "notification" using the new control :
CTDB_CONTROL_REGISTER_NOTIFY = 114,
This control takes as indata a structure like this :
struct ctdb_client_notify_register {
uint64_t srvid;
uint32_t len;
uint8_t notify_data[1];
};
srvid is the srvid used in the space set aside above.
len and notify_data is an arbitrary blob.
When notifications are later sent out to all clients, this is the payload of that notification message.
If a client has registered with control 114 and then disconnects from ctdbd, ctdbd will broadcast a message to that srvid to all nodes/listeners in the cluster.
A client can resister itself with as many different srvid's it want, but this is handled through a linked list from the client structure so it mainly designed for "few notifications per client".
3, a client that no longer wants to have a notification set up can deregister using control
CTDB_CONTROL_DEREGISTER_NOTIFY = 115,
which takes this as arguments :
struct ctdb_client_notify_deregister {
uint64_t srvid;
};
When a client deregisters, there will no longer be sent a message to all other clients when this client disconnects from ctdbd.
(This used to be ctdb commit f1b6ee4a55cdca60f93d992f0431d91bf301af2c)
Add a new tunable to control the maximum queue size we allow to a blocked client before we start discarding REQ_MESSAGES instead of queueing them for delivery.
This avoids having queued up very very large number of MESSAGES that samba semds
between eachother to nodes that are blocked/banned/stopped for extended periods
.
(This used to be ctdb commit f76d6fed8f9630450263b9fa4b5fdf3493fb1e11)
Add a tuneable so that when scripts starts to hang/timeout, we can make the node unhealthy instead of banned
(This used to be ctdb commit 2e9fc6f0609833c6d8146196011ef780669d615d)
master to perform an explicit ip reallocation.
This is more reliable and faster than having the recovery dameon track these
changes, and since we now have an explicit method to ask the recovery daemon
to perform an explicit ip reallocation, we should use this.
(This used to be ctdb commit 3807681e74f4bfe92befdae6ed616ff5f1a99880)
transactions we start across all tdb databased during the recovery.
this allows us to properly clean up and delete these tdb transactions on a
recovery failure.
(This used to be ctdb commit b2ce8b900a7d00944c84e0574fea5b371064a06d)
database priorities will be used to control in which order databases are locked during recovery in.
(This used to be ctdb commit 67741c0ee01916d94cace8e9462ef02507e06078)
This is useful when we are moving addresses using moveip in the cluster since otherwise if we collide with the recovery daemons own check we could cause a recovery
(This used to be ctdb commit 9c63858c0b22c81eaccb9865a414af0bbb2833d4)
Remove the explicit vacuum/repack commands from the 00.ctdb eventscript
and implement this in the ctdb daemon.
Combine vacuuming and repacking into one
cheap read traverse to enumerate all candidate records
and one write traverse that both repacks the database and also deletes the record locally where we are lmaster and where the records have already been deleted remotely.
this code also adds initial autotuning heuristics for the vacuum intervals and how many records to delete in each iteration.
minor stylish changes made by ronnie s
(This used to be ctdb commit 95a3ee551241aa164967991fe5efe078e1714bde)
In ctdb_client.c:ctdb_transaction_commit(), after a failed
TRANS2_COMMIT control call (for instance due to the 1-second
being exceeded waiting for a busy node's reply), there is a
1-second gap between the transaction_cancel() and
replay_transaction() calls in which there is no lock on the
persistent db. And due to the lack of global state
indicating that a transaction is in progress in ctdbd, other nodes
may succeed to start transactions on the db in this gap and
even worse work on top of the possibly already pushed changes.
So the data diverges on the several nodes.
This change fixes this by introducing global state for a transaction
commit being active in the ctdb_db_context struct and in a db_id field
in the client so that a client keeps track of _which_ tdb it as
transaction commit running on. These data are set by ctdb upon
entering the trans2_commit control and they are cleared in the
trans2_error or trans2_finished controls. This makes it impossible
to start a nother transaction or migrate a record to a different
node while a transaction is active on a persistent tdb, including
the retry loop.
This approach is dead lock free and still allows recovery process
to be started in the retry-gap between cancel and replay.
Also note, that this solution does not require any change in the
client side.
This was debugged and developed together with
Stefan Metzmacher <metze@samba.org> - thanks!
Michael
(This used to be ctdb commit f88103516e5ad723062fb95fcb07a128f1069d69)
This event is called when a node is stopped and is used by eventscripts that need to do certain cleanup and removal of configuration or ip addresses or routing ...
Note that a STOPPED node is considered "inactive" and as such will not be running the "recovered" event when the rest of the cluster has recovered.
(This used to be ctdb commit 65e9309564611bf937ded3c74a79abff895d7c59)
This node flag means the node is DISABLED and that all its public ip addresses
are failed over, but also that it has been removed from the VNNmap.
A STOPPED node should be in recovery mode active untill restarted using the continue command.
Adding two new commands "ctdb stop" "ctdb continue"
(This used to be ctdb commit d47dab1026deba0554f21282a59bd172209ea066)
validate the input values used and refuse setting the debug level to an unknown value
(This used to be ctdb commit daec49cea1790bcc64599959faf2159dec2c5929)
