Stops or restarts a HAWQ system.
hawq stop object [-a] [-M|--mode smart | fast | immediate] [-t timeout_seconds] [-l logfile_directory] [-v|--verbose | -q|--quiet] [--ignore_bad-hosts] cluster | allsegments hawq stop object -u|--reload [-l logfile_directory] hawq stop --version hawq stop -? | -h | --help
hawq stop utility is used to stop the database servers that comprise a HAWQ system. When you stop a HAWQ system, you are actually stopping several
postgres database server processes at once (the master and all of the segment instances). The
hawq stop utility handles the shutdown of the individual instances. Each instance is shutdown in parallel.
By default, you are not allowed to shut down HAWQ if there are any client connections to the database. Use the
-M fast option to roll back all in progress transactions and terminate any connections before shutting down. If there are any transactions in progress, the default behavior is to wait for them to commit before shutting down.
-u option, the utility uploads changes made to the master
pg_hba.conf file or to runtime configuration parameters in the master
hawq-site.xml file without interruption of service. Note that any active sessions will not pick up the changes until they reconnect to the database.
Stop a HAWQ cluster.
Shuts down a HAWQ master instance that was started in maintenance mode.
Stop a local segment node.
Stop the HAWQ standby master process.
Stop all segments.
Do not prompt the user for confirmation before executing.
The directory to write the log file. The default is
-M smart | fast | immediate
Smart shutdown is the default. Shutdown fails with a warning message, if active connections are found.
Fast shut down interrupts and rolls back any transactions currently in progress .
Immediate shutdown aborts transactions in progress and kills all
postgres processes without allowing the database server to complete transaction processing or clean up any temporary or in-process work files. Because of this, immediate shutdown is not recommended. In some instances, it can cause database corruption that requires manual recovery.
Run in quiet mode. Command output is not displayed on the screen, but is still written to the log file.
Specifies a timeout threshold (in seconds) to wait for a segment instance to shutdown. If a segment instance does not shut down in the specified number of seconds,
hawq stop displays a message indicating that one or more segments are still in the process of shutting down and that you cannot restart HAWQ until the segment instance(s) are stopped. This option is useful in situations where
hawq stop is executed and there are very large transactions that need to rollback. These large transactions can take over a minute to rollback and surpass the default timeout period of 600 seconds.
–ignore_bad_hosts cluster | allsegments
Overrides copying configuration files to a host on which SSH validation fails. If ssh to a skipped host is reestablished, make sure the configuration files are re-synched once it is reachable.
This option reloads configuration parameter values without restarting the HAWQ cluster.
Displays detailed status, progress and error messages output by the utility.
-? | -h | –help (help)
Displays the online help.
–version (show utility version)
Displays the version of this utility.
Stop a HAWQ system in smart mode:
hawq stop cluster -M smart
Stop a HAWQ system in fast mode:
hawq stop cluster -M fast
Stop a master instance that was started in maintenance mode:
hawq stop master -m
pg_hba.conf files after making configuration changes but do not shutdown the HAWQ array:
hawq stop cluster -u