Hi all!
The following snippet raises IndexError: pop from empty list. Since it gets
executed in a task queue, the google app engine retries as ususal and then
succeeds with same incoming data set. But it's a annoyance. The incoming
data to_create is a standard python list.
@ndb.tasklet def create_new_stuff(to_create): if not to_create: raise
ndb.Return([]) first, last = yield
Translator.allocate_ids_async(len(to_create)) translator_ids = range(first,
last + 1) # we from time to time get an IndexError on the
translator_ids.pop(), huh? assert len(translator_ids) == len(to_create),
(first, last, len(to_create)) logger.debug("Preallocated Translators: %s
==? %s" % ( len(translator_ids), len(to_create))) @ndb.tasklet def
create_stuff_transactional(item): @ndb.tasklet def txn(): try:
translator_key = ndb.Key(Translator, translator_ids.pop()) except
IndexError: logger.debug('Now: %s' % len(to_create)) raise ... raise
ndb.Return(...new_entity...) new_entity = yield ndb.transaction_async(txn,
xg=True) raise ndb.Return(new_entity) tasks = yield
[create_stuff_transactional(item) for item in to_create] raise
ndb.Return(tasks)
If it fails, the above code logs
1.
Preallocated Translators: 3 ==? 3
2.
Now: 3
WTF?
It may be I just looked too often at this fragment, but the hell I don't
get it.
Any ideas?
Regards
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