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NDB_WAITER

NAME
SYNOPSIS
DESCRIPTION
COPYRIGHT
SEE ALSO
AUTHOR

NAME

ndb_waiter − wait for NDB 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:

• NO_CONTACT: The node cannot be contacted.

• 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.

• 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.

• STARTING: The node's ndbd process has started, but the node has not yet joined the cluster.

• STARTED: The node is operational, and has joined the cluster.

• SHUTTING_DOWN: The node is shutting down.

• SINGLE USER MODE: This is shown for all cluster data nodes when the cluster is in single user mode.

Options that can be used with ndb_waiter are shown in the following table. Additional descriptions follow the table.

Table 23.50. Command−line options used with the program ndb_waiter
Usage

ndb_waiter [−c connection_string]

Additional Options

−−character−sets−dir

Directory containing character sets.

−−connect−retries

Number of times to retry connection before giving up.

−−connect−retry−delay

Number of seconds to wait between attempts to contact management server.

−−connect−string

Same as −−ndb−connectstring.

−−core−file

Write core file on error; used in debugging.

−−defaults−extra−file

Read given file after global files are read.

−−defaults−file

Read default options from given file only.

−−defaults−group−suffix

Also read groups with concat(group, suffix).

−−login−path

Read given path from login file.

−−help

Display help text and exit.

−−ndb−connectstring

Set connect string for connecting to ndb_mgmd. Syntax: "[nodeid=id;][host=]hostname[:port]". Overrides entries in NDB_CONNECTSTRING and my.cnf.

−−ndb−mgmd−host

Same as −−ndb−connectstring.

−−ndb−nodeid

Set node ID for this node, overriding any ID set by −−ndb−connectstring.

−−ndb−optimized−node−selection

Enable optimizations for selection of nodes for transactions. Enabled by default; use −−skip−ndb−optimized−node−selection to disable.

−−no−contact, −n Instead of waiting for the STARTED state, ndb_waiter continues running until the cluster reaches NO_CONTACT status before exiting.

−−no−defaults

Do not read default options from any option file other than login file.

−−not−started Instead of waiting for the STARTED state, ndb_waiter continues running until the cluster reaches NOT_STARTED status before exiting.

−−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:

$> ndb_waiter −−nowait−nodes=1,3,7−9

Important
Do not use this option together with the −−wait−nodes option.

−−print−defaults

Print program argument list and exit.

−−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).

−−single−user The program waits for the cluster to enter single user mode.

−−usage

Display help text and exit; same as −−help.

−−version

Display version information and exit.

−−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:

$> 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.

$> ./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

Note
If no connection string is specified, then ndb_waiter tries to connect to a management on localhost, and reports Connecting to mgmsrv at (null).

Prior to NDB 8.0.20, this program printed NDBT_ProgramExit − status upon completion of its run, due to an unnecessary dependency on the NDBT testing library. This dependency has been removed, eliminating the extraneous output.

COPYRIGHT

Copyright © 1997, 2021, Oracle and/or its affiliates.

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/).