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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
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