parallel.controller.hub

Module: parallel.controller.hub

Inheritance diagram for IPython.parallel.controller.hub:

The IPython Controller Hub with 0MQ This is the master object that handles connections from engines and clients, and monitors traffic through the various queues.

Authors:

• Min RK

Classes

EngineConnector

class IPython.parallel.controller.hub.EngineConnector(**kw)

Bases: IPython.utils.traitlets.HasTraits

A simple object for accessing the various zmq connections of an object. Attributes are: id (int): engine ID uuid (str): uuid (unused?) queue (str): identity of queue’s XREQ socket registration (str): identity of registration XREQ socket heartbeat (str): identity of heartbeat XREQ socket

__init__(**kw)

classmethod class_trait_names(**metadata)

Get a list of all the names of this classes traits.

This method is just like the trait_names() method, but is unbound.

classmethod class_traits(**metadata)

Get a list of all the traits of this class.

This method is just like the traits() method, but is unbound.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

control

A casting version of the byte string trait.

heartbeat

A casting version of the byte string trait.

id

An integer trait.

Longs that are unnecessary (<= sys.maxint) are cast to ints.

on_trait_change(handler, name=None, remove=False)

Setup a handler to be called when a trait changes.

This is used to setup dynamic notifications of trait changes.

Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

Parameters :

handler : callable

A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new).

name : list, str, None

If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name.

remove : bool

If False (the default), then install the handler. If True then unintall it.

pending

An instance of a Python set.

queue

A casting version of the byte string trait.

registration

A casting version of the byte string trait.

trait_metadata(traitname, key)

Get metadata values for trait by key.

trait_names(**metadata)

Get a list of all the names of this classes traits.

traits(**metadata)

Get a list of all the traits of this class.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

Hub

class IPython.parallel.controller.hub.Hub(**kwargs)

Bases: IPython.zmq.session.SessionFactory

The IPython Controller Hub with 0MQ connections

Parameters :

loop: zmq IOLoop instance :

session: Session object :

<removed> context: zmq context for creating new connections (?) :

queue: ZMQStream for monitoring the command queue (SUB) :

query: ZMQStream for engine registration and client queries requests (XREP) :

heartbeat: HeartMonitor object checking the pulse of the engines :

notifier: ZMQStream for broadcasting engine registration changes (PUB) :

db: connection to db for out of memory logging of commands :

NotImplemented

engine_info: dict of zmq connection information for engines to connect :

to the queues.

client_info: dict of zmq connection information for engines to connect :

to the queues.

__init__(**kwargs)

# universal: loop: IOLoop for creating future connections session: streamsession for sending serialized data # engine: queue: ZMQStream for monitoring queue messages query: ZMQStream for engine+client registration and client requests heartbeat: HeartMonitor object for tracking engines # extra: db: ZMQStream for db connection (NotImplemented) engine_info: zmq address/protocol dict for engine connections client_info: zmq address/protocol dict for client connections

all_completed

An instance of a Python set.

by_ident

An instance of a Python dict.

check_load(client_id, msg)

classmethod class_config_section()

Get the config class config section

classmethod class_get_help(inst=None)

Get the help string for this class in ReST format.

If inst is given, it’s current trait values will be used in place of class defaults.

classmethod class_get_trait_help(trait, inst=None)

Get the help string for a single trait.

If inst is given, it’s current trait values will be used in place of the class default.

classmethod class_print_help(inst=None)

Get the help string for a single trait and print it.

classmethod class_trait_names(**metadata)

Get a list of all the names of this classes traits.

This method is just like the trait_names() method, but is unbound.

classmethod class_traits(**metadata)

Get a list of all the traits of this class.

This method is just like the traits() method, but is unbound.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

client_info

An instance of a Python dict.

clients

An instance of a Python dict.

completed

An instance of a Python dict.

config

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

connection_request(client_id, msg)

Reply with connection addresses for clients.

context

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

db

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

db_query(client_id, msg)

Perform a raw query on the task record database.

dead_engines

An instance of a Python set.

dispatch_db(msg)

dispatch_monitor_traffic(msg)

all ME and Task queue messages come through here, as well as IOPub traffic.

dispatch_query(msg)

Route registration requests and queries from clients.

engine_info

An instance of a Python dict.

engines

An instance of a Python dict.

finish_registration(heart)

Second half of engine registration, called after our HeartMonitor has received a beat from the Engine’s Heart.

get_history(client_id, msg)

Get a list of all msg_ids in our DB records

get_results(client_id, msg)

Get the result of 1 or more messages.

handle_heart_failure(heart)

handler to attach to heartbeater. called when a previously registered heart fails to respond to beat request. triggers unregistration

handle_new_heart(heart)

handler to attach to heartbeater. Called when a new heart starts to beat. Triggers completion of registration.

heartmonitor

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

hearts

An instance of a Python dict.

ids

An instance of a Python set.

incoming_registrations

An instance of a Python dict.

keytable

An instance of a Python dict.

log

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

logname

A trait for unicode strings.

loop

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

mia_task_request(idents, msg)

monitor

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

notifier

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

on_trait_change(handler, name=None, remove=False)

Setup a handler to be called when a trait changes.

This is used to setup dynamic notifications of trait changes.

Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

Parameters :

handler : callable

A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new).

name : list, str, None

If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name.

remove : bool

If False (the default), then install the handler. If True then unintall it.

pending

An instance of a Python set.

purge_results(client_id, msg)

Purge results from memory. This method is more valuable before we move to a DB based message storage mechanism.

query

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

queue_status(client_id, msg)

Return the Queue status of one or more targets. if verbose: return the msg_ids else: return len of each type. keys: queue (pending MUX jobs)

tasks (pending Task jobs) completed (finished jobs from both queues)

queues

An instance of a Python dict.

register_engine(reg, msg)

Register a new engine.

registration_timeout

An integer trait.

Longs that are unnecessary (<= sys.maxint) are cast to ints.

resubmit

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

resubmit_task(client_id, msg)

Resubmit one or more tasks.

save_iopub_message(topics, msg)

save an iopub message into the db

save_queue_request(idents, msg)

save_queue_result(idents, msg)

save_task_destination(idents, msg)

save_task_request(idents, msg)

Save the submission of a task.

save_task_result(idents, msg)

save the result of a completed task.

session

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

shutdown_request(client_id, msg)

handle shutdown request.

tasks

An instance of a Python dict.

trait_metadata(traitname, key)

Get metadata values for trait by key.

trait_names(**metadata)

Get a list of all the names of this classes traits.

traits(**metadata)

Get a list of all the traits of this class.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

unassigned

An instance of a Python set.

unregister_engine(ident, msg)

Unregister an engine that explicitly requested to leave.

update_config(config)

Fire the traits events when the config is updated.

HubFactory

class IPython.parallel.controller.hub.HubFactory(**kwargs)

Bases: IPython.parallel.factory.RegistrationFactory

The Configurable for setting up a Hub.

__init__(**kwargs)

classmethod class_config_section()

Get the config class config section

classmethod class_get_help(inst=None)

Get the help string for this class in ReST format.

If inst is given, it’s current trait values will be used in place of class defaults.

classmethod class_get_trait_help(trait, inst=None)

Get the help string for a single trait.

If inst is given, it’s current trait values will be used in place of the class default.

classmethod class_print_help(inst=None)

Get the help string for a single trait and print it.

classmethod class_trait_names(**metadata)

Get a list of all the names of this classes traits.

This method is just like the trait_names() method, but is unbound.

classmethod class_traits(**metadata)

Get a list of all the traits of this class.

This method is just like the traits() method, but is unbound.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

client_ip

A trait for unicode strings.

client_transport

A trait for unicode strings.

config

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

construct()

context

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

control

An instance of a Python tuple.

db

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

db_class

A string holding a valid dotted object name in Python, such as A.b3._c

engine_ip

A trait for unicode strings.

engine_transport

A trait for unicode strings.

hb

An instance of a Python tuple.

heartmonitor

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

init_hub()

construct

iopub

An instance of a Python tuple.

ip

A trait for unicode strings.

log

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

logname

A trait for unicode strings.

loop

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

mon_port

An integer trait.

Longs that are unnecessary (<= sys.maxint) are cast to ints.

monitor_ip

A trait for unicode strings.

monitor_transport

A trait for unicode strings.

monitor_url

A trait for unicode strings.

mux

An instance of a Python tuple.

notifier_port

An integer trait.

Longs that are unnecessary (<= sys.maxint) are cast to ints.

on_trait_change(handler, name=None, remove=False)

Setup a handler to be called when a trait changes.

This is used to setup dynamic notifications of trait changes.

Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

Parameters :

handler : callable

A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new).

name : list, str, None

If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name.

remove : bool

If False (the default), then install the handler. If True then unintall it.

regport

An integer trait.

Longs that are unnecessary (<= sys.maxint) are cast to ints.

session

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

start()

task

An instance of a Python tuple.

trait_metadata(traitname, key)

Get metadata values for trait by key.

trait_names(**metadata)

Get a list of all the names of this classes traits.

traits(**metadata)

Get a list of all the traits of this class.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

transport

A trait for unicode strings.

update_config(config)

Fire the traits events when the config is updated.

url

A trait for unicode strings.

Functions

IPython.parallel.controller.hub.empty_record()

Return an empty dict with all record keys.

IPython.parallel.controller.hub.init_record(msg)

Initialize a TaskRecord based on a request.