Beekeeper::Service::Supervisor::Worker - Worker pool supervisor.
Version 0.01
A Supervisor worker is created automatically in every worker pool.
It keeps a shared table of the status of every worker connected to a logical bus in every broker, routinely checking local workers and keeping track of workers periodic performance reports.
Handler for 'supervisor.worker_status' job.
This job is sent by workers every few seconds and acts as a heart-beat. It contains statistical data about worker performance.
Note that workers doing long jobs (like slow SQL queries) may not send this request timely.
Handler for 'supervisor.worker_exit' job.
This job is sent by workers just before exiting gracefully. It is not sent when worker is terminated abruptly (as process has no chance to do so).
Check every worker process in this host (even workers in other pools) to ensure that they are running, and measure their memory usage.
This is needed as workers with long blocking procedures may not report its status timely, and abruptly terminated workers has no chance to report that they had exited.
It would be nice to measure CPU usage too.
In the case of all workers of a given service being down, all requests sent to the service will timeout as no one is serving them. This may cause a serious disruption in the application, as any other service depending of the broken one will halt too for the duration of the timeout.
In order to mitigate this situation the Sinkhole service will be notified when unserviced queues are detected, making it to respond immediately to all requests with an error response. Then callers will quickly receive an error response instead of timing out.
Handler for 'supervisor.get_workers_status' job.
Used by bkpr-top command line tool.
Handler for 'supervisor.get_services_status' job.
Handler for 'supervisor.restart_workers' notification.
This request is sent by bkpr-restart command line tool.
Handler for 'supervisor.restart_pool' notification.
José Micó, jose.mico@gmail.com
jose.mico@gmail.com
Copyright 2015 José Micó.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language itself.
This software is distributed in the hope that it will be useful, but it is provided “as is” and without any express or implied warranties. For details, see the full text of the license in the file LICENSE.
3 POD Errors
The following errors were encountered while parsing the POD:
'=item' outside of any '=over'
You forgot a '=back' before '=head1'
Non-ASCII character seen before =encoding in 'José'. Assuming UTF-8
To install Beekeeper, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Beekeeper
CPAN shell
perl -MCPAN -e shell install Beekeeper
For more information on module installation, please visit the detailed CPAN module installation guide.