ndb_waiter(1) MySQL Database System ndb_waiter(1)
NAME
ndb_waiter - wait for MySQL Cluster to reach a given status
SYNOPSIS
ndb_waiter options
DESCRIPTION
ndb_waiter repeatedly (each 100 milliseconds) prints out the status of
all cluster data nodes until either the cluster reaches a given status
or the --timeout limit is exceeded, then exits. By default, it waits
for the cluster to achieve STARTED status, in which all nodes have
started and connected to the cluster. This can be overridden using the
--no-contact and --not-started options.
The node states reported by this utility are as follows:
o NO_CONTACT: The node cannot be contacted.
o UNKNOWN: The node can be contacted, but its status is not yet
known. Usually, this means that the node has received a START or
RESTART command from the management server, but has not yet acted
on it.
o NOT_STARTED: The node has stopped, but remains in contact with the
cluster. This is seen when restarting the node using the management
client's RESTART command.
o STARTING: The node's ndbd process has started, but the node has not
yet joined the cluster.
o STARTED: The node is operational, and has joined the cluster.
o SHUTTING_DOWN: The node is shutting down.
o SINGLE USER MODE: This is shown for all cluster data nodes when the
cluster is in single user mode.
Usage
ndb_waiter [-c connect_string]
Additional Options
o --no-contact, -n
Instead of waiting for the STARTED state, ndb_waiter continues
running until the cluster reaches NO_CONTACT status before exiting.
o --not-started
Instead of waiting for the STARTED state, ndb_waiter continues
running until the cluster reaches NOT_STARTED status before
exiting.
o --timeout=seconds, -t seconds
Time to wait. The program exits if the desired state is not
achieved within this number of seconds. The default is 120 seconds
(1200 reporting cycles).
o --single-user
The program waits for the cluster to enter single user mode.
o --nowait-nodes=list
When this option is used, ndb_waiter does not wait for the nodes
whose IDs are listed. The list is comma-delimited; ranges can be
indicated by dashes, as shown here:
shell> ndb_waiter --nowait-nodes=1,3,7-9
Important
Do not use this option together with the --wait-nodes option.
o --wait-nodes=list, -w list
When this option is used, ndb_waiter waits only for the nodes whose
IDs are listed. The list is comma-delimited; ranges can be
indicated by dashes, as shown here:
shell> ndb_waiter --wait-nodes=2,4-6,10
Important
Do not use this option together with the --nowait-nodes option.
Sample Output. Shown here is the output from ndb_waiter when run
against a 4-node cluster in which two nodes have been shut down and
then started again manually. Duplicate reports (indicated by "...") are
omitted.
shell> ./ndb_waiter -c localhost
Connecting to mgmsrv at (localhost)
State node 1 STARTED
State node 2 NO_CONTACT
State node 3 STARTED
State node 4 NO_CONTACT
Waiting for cluster enter state STARTED
...
State node 1 STARTED
State node 2 UNKNOWN
State node 3 STARTED
State node 4 NO_CONTACT
Waiting for cluster enter state STARTED
...
State node 1 STARTED
State node 2 STARTING
State node 3 STARTED
State node 4 NO_CONTACT
Waiting for cluster enter state STARTED
...
State node 1 STARTED
State node 2 STARTING
State node 3 STARTED
State node 4 UNKNOWN
Waiting for cluster enter state STARTED
...
State node 1 STARTED
State node 2 STARTING
State node 3 STARTED
State node 4 STARTING
Waiting for cluster enter state STARTED
...
State node 1 STARTED
State node 2 STARTED
State node 3 STARTED
State node 4 STARTING
Waiting for cluster enter state STARTED
...
State node 1 STARTED
State node 2 STARTED
State node 3 STARTED
State node 4 STARTED
Waiting for cluster enter state STARTED
NDBT_ProgramExit: 0 - OK
Note
If no connectstring is specified, then ndb_waiter tries to connect
to a management on localhost, and reports Connecting to mgmsrv at
(null).
COPYRIGHT
Copyright (C) 1997, 2012, Oracle and/or its affiliates. All rights
reserved.
This documentation is free software; you can redistribute it and/or
modify it only under the terms of the GNU General Public License as
published by the Free Software Foundation; version 2 of the License.
This documentation is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with the program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see
http://www.gnu.org/licenses/.
SEE ALSO
For more information, please refer to the MySQL Reference Manual, which
may already be installed locally and which is also available online at
http://dev.mysql.com/doc/.
AUTHOR
Oracle Corporation (http://dev.mysql.com/).
MySQL 5.5 03/02/2012 ndb_waiter(1)
mysql 5.5.22 - Generated Fri Apr 6 12:55:45 CDT 2012