Commit e024f665 authored by Loic Esteve's avatar Loic Esteve

Improvements in the joblib backend

* Catching exceptions to have error messages inside ZOPE rather than timeout
* Fix timeout bug when timeout is None
* Preparation for the the two-stage computation when the transaction is aborted
  retried when all the jobs have finished running.
parent 445f70ba
......@@ -26,15 +26,33 @@
##############################################################################
ENABLE_JOBLIB = True
import sys
import time
import transaction
from zLOG import LOG, INFO, WARNING
try:
from sklearn.externals.joblib import register_parallel_backend
from sklearn.externals.joblib.parallel import ParallelBackendBase, parallel_backend
from sklearn.externals.joblib.parallel import FallbackToBackend, SequentialBackend
from sklearn.externals.joblib._parallel_backends import SafeFunction
from sklearn.externals.joblib.my_exceptions import TransportableException, WorkerInterrupt
from sklearn.externals.joblib.format_stack import format_exc
except ImportError:
from zLOG import LOG, WARNING
LOG("CMFActivityBackend", WARNING, "CLASS NOT LOADED!!!")
ENABLE_JOBLIB = False
class MySafeFunction(SafeFunction):
"""Wrapper around a SafeFunction that catches any exception
The exception can be handled in CMFActivityResult.get
"""
def __call__(self, *args, **kwargs):
try:
return super(MySafeFunction, self).__call__(*args, **kwargs)
except Exception as exc:
return exc
class CMFActivityResult(object):
def __init__(self, active_process, callback):
......@@ -43,16 +61,19 @@ class CMFActivityResult(object):
def get(self, timeout=None):
while not self.active_process.getResultList():
time.sleep(1)
if timeout is not None:
timeout -= 1
if timeout < 0:
raise RuntimeError('Timeout reached')
transaction.commit()
result = self.active_process.getResultList()[0].result
# TODO raise before or after the callback?
if isinstance(result, Exception):
raise result
if self.callback is not None:
self.callback(result)
return result
if ENABLE_JOBLIB:
class CMFActivityBackend(ParallelBackendBase):
def __init__(self, *args, **kwargs):
......@@ -62,20 +83,37 @@ if ENABLE_JOBLIB:
return n_jobs
def apply_async(self, batch, callback=None):
"""Schedule a func to be run"""
active_process = self.zope_context.portal_activities.newActiveProcess()
active_process.batch = batch
active_process.activate(activity='SQLQueue', active_process=active_process).batch()
portal_activities = self.zope_context.portal_activities
# the creation of activitiy process here, might be removed.
active_process = portal_activities.newActiveProcess()
# SQLJoblib == JoblibActivity
joblib_result = portal_activities.activate(activity='SQLQueue',
active_process=active_process).Base_callSafeFunction(MySafeFunction(batch))
# While activate() don't return the joblib_result
if joblib_result is None:
# Transaction commit, is a code crime.
transaction.commit()
return CMFActivityResult(active_process, callback)
joblib_result = CMFActivityResult(active_process, callback)
return joblib_result
def configure(self, n_jobs=1, parallel=None, **backend_args):
"""Reconfigure the backend and return the number of workers. This
makes it possible to reuse an existing backend instance for successive
independent calls to Parallel with different parameters."""
# TODO
LOG("CMFActivityBackend", INFO, 'n_jobs={}'.format(n_jobs))
LOG("CMFActivityBackend", INFO, 'parallel={}'.format(parallel))
if n_jobs == 1:
raise FallbackToBackend(SequentialBackend())
self.parallel = parallel
# self.zope_context = backend_args['zope_context']
return self.effective_n_jobs(n_jobs)
register_parallel_backend('CMFActivity', CMFActivityBackend)
else:
class CMFActivityBackend(object):
......
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