05-14-2013
Asynchronous communication between master and slave threads
I am writing a process that has a master thread and a set of slave threads. Master thread is supposed to get jobs dynamically and assign to slave thread which is free. Master also get results back from slaves once a job is done. The number of slaves should be adjustable dynamically based on job load.
The interesting thing is that when job is in progress, master may decide to stop a job. I am thinking of some way of communication between one(master) and many(slaves) to assign jobs, stop a job (specific to a salve which does the job), get results from slave.
Will message queues be useful?
Thanks in advance
/Tamil
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IPROP(8) BSD System Manager's Manual IPROP(8)
NAME
iprop, ipropd-master, ipropd-slave -- propagate changes to a Heimdal Kerberos master KDC to slave KDCs
SYNOPSIS
ipropd-master [-c string | --config-file=string] [-r string | --realm=string] [-k kspec | --keytab=kspec] [-d file | --database=file]
[--slave-stats-file=file] [--time-missing=time] [--time-gone=time] [--detach] [--version] [--help]
ipropd-slave [-c string | --config-file=string] [-r string | --realm=string] [-k kspec | --keytab=kspec] [--time-lost=time] [--detach]
[--version] [--help] master
DESCRIPTION
ipropd-master is used to propagate changes to a Heimdal Kerberos database from the master Kerberos server on which it runs to slave Kerberos
servers running ipropd-slave.
The slaves are specified by the contents of the slaves file in the KDC's database directory, e.g. /var/heimdal/slaves. This has principals
one per-line of the form
iprop/slave@REALM
where slave is the hostname of the slave server in the given REALM, e.g.
iprop/kerberos-1.example.com@EXAMPLE.COM
On a slave, the argument master specifies the hostname of the master server from which to receive updates.
In contrast to hprop(8), which sends the whole database to the slaves regularly, iprop normally sends only the changes as they happen on the
master. The master keeps track of all the changes by assigning a version number to every change to the database. The slaves know which was
the latest version they saw, and in this way it can be determined if they are in sync or not. A log of all the changes is kept on the mas-
ter. When a slave is at an older version than the oldest one in the log, the whole database has to be sent.
The changes are propagated over a secure channel (on port 2121 by default). This should normally be defined as ``iprop/tcp'' in
/etc/services or another source of the services database. The master and slaves must each have access to a keytab with keys for the iprop
service principal on the local host.
There is a keep-alive feature logged in the master's slave-stats file (e.g. /var/heimdal/slave-stats).
Supported options for ipropd-master:
-c string, --config-file=string
-r string, --realm=string
-k kspec, --keytab=kspec
keytab to get authentication from
-d file, --database=file
Database (default per KDC)
--slave-stats-file=file
file for slave status information
--time-missing=time
time before slave is polled for presence (default 2 min)
--time-gone=time
time of inactivity after which a slave is considered gone (default 5 min)
--detach
detach from console
--version
--help
Supported options for ipropd-slave:
-c string, --config-file=string
-r string, --realm=string
-k kspec, --keytab=kspec
keytab to get authentication from
--time-lost=time
time before server is considered lost (default 5 min)
--detach
detach from console
--version
--help
Time arguments for the relevant options above may be specified in forms like 5 min, 300 s, or simply a number of seconds.
FILES
slaves, slave-stats in the database directory.
SEE ALSO
krb5.conf(5), hprop(8), hpropd(8), iprop-log(8), kdc(8).
Heimdal May 24, 2005 Heimdal