Public bug reported:
Config options code like this doesn't generate output in the
sample.config file:
ALL_OPTS = itertools.chain(
compute_opts,
resource_tracker_opts,
allocation_ratio_opts
)
def register_opts(conf):
conf.register_opts(ALL_OPTS)
def list_opts():
return {'DEFAULT': ALL_OPTS}
The reason is that the generator created by "itertools.chain" doesn't
get reset after getting used in "register_opts". A simple complete
example:
import itertools
a = [1, 2]
b = [3, 4]
ab = itertools.chain(a, b)
print("printing 'ab' for the first time")
for i in ab:
print(i)
print("printing 'ab' for the second time")
for i in ab:
print(i)
The combined list 'ab' won't get printed a second time. The same thing
happens when the oslo.config generator wants to print the sample.config
file. This means we use either:
ab = list(itertools.chain(a, b))
or
ab = a + b
** Affects: nova
Importance: High
Assignee: Markus Zoeller (markus_z) (mzoeller)
Status: Confirmed
** Changed in: nova
Importance: Undecided => High
** Changed in: nova
Status: New => Confirmed
** Changed in: nova
Assignee: (unassigned) => Markus Zoeller (markus_z) (mzoeller)
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https://bugs.launchpad.net/bugs/1565824
Title:
config option generation doesn't work with itertools.chain
Status in OpenStack Compute (nova):
Confirmed
Bug description:
Config options code like this doesn't generate output in the
sample.config file:
ALL_OPTS = itertools.chain(
compute_opts,
resource_tracker_opts,
allocation_ratio_opts
)
def register_opts(conf):
conf.register_opts(ALL_OPTS)
def list_opts():
return {'DEFAULT': ALL_OPTS}
The reason is that the generator created by "itertools.chain" doesn't
get reset after getting used in "register_opts". A simple complete
example:
import itertools
a = [1, 2]
b = [3, 4]
ab = itertools.chain(a, b)
print("printing 'ab' for the first time")
for i in ab:
print(i)
print("printing 'ab' for the second time")
for i in ab:
print(i)
The combined list 'ab' won't get printed a second time. The same thing
happens when the oslo.config generator wants to print the
sample.config file. This means we use either:
ab = list(itertools.chain(a, b))
or
ab = a + b
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1565824/+subscriptions
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