New submission from Faheem Mitha <[email protected]>:
The documentation in
http://docs.python.org/library/multiprocessing.html#module-multiprocessing.pool
says
"""class multiprocessing.pool.AsyncResult¶
The class of the result returned by Pool.apply_async() and Pool.map_async().
get([timeout])
Return the result when it arrives. If timeout is not None and the result does
not arrive within timeout seconds then multiprocessing.TimeoutError is raised.
If the remote call raised an exception then that exception will be reraised by
get()."""
Consider the example code
################################
from multiprocessing import Pool
def go():
print 1
raise Exception("foobar")
print 2
p = Pool()
x = p.apply_async(go)
x.get()
p.close()
p.join()
###########################
The traceback from this is
Traceback (most recent call last):
File "<stdin>", line 10, in <module>
File "/usr/lib/python2.6/multiprocessing/pool.py", line 422, in get
raise self._value
Exception: foobar
1
As is clear in this example, this is not a full traceback - it only shows the
traceback to the line where get is located and gives no further information.
This is the case in all the other places I have used get. It seems to me that
it *should* return the full traceback, which may contain important information
missing in such a partial one. I don't know whether one would call this a
feature request or a bug report. Maybe there is some technical reason why this
is not possible, but I can't think of one.
----------
components: Library (Lib)
messages: 151651
nosy: fmitha
priority: normal
severity: normal
status: open
title: get method of multiprocessing.pool.Async should return full traceback
type: enhancement
versions: Python 2.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue13831>
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