zhuyifei1999 closed this task as "Declined".
zhuyifei1999 added a comment.
This is an instance of cyclic reference. The frame refers to the entry, the
entry has _getexception, the exception refers to the frame. The exception would
also definitely reference the inner frame where the exception is instantiated
and that frame would refer to the outer frame by `f_back`
To prove this is a reference cycle, this works:
import osmium, pywikibot
import gc
en_wiki = pywikibot.Site("en", "wikipedia")
class TestHandler(osmium.SimpleHandler):
def node(self, n):
print(n.id)
entry = pywikibot.Page(en_wiki, 'non-existing article or even
redirect')
entry.text
entry.clear_cache() # Clear cache even works if there is no call
to `.text`
del entry
gc.collect()
h = TestHandler()
# Download from
http://download.geofabrik.de/europe/liechtenstein-latest.osm.pbf
h.apply_file('liechtenstein-latest.osm.pbf')
`gc.collect` would kill unused reference cycles.
osmium should not care about reference cycles. Ask them to perform a GC if
they suspect values being used referred to outside the function.
TASK DETAIL
https://phabricator.wikimedia.org/T261162
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To: zhuyifei1999
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Dijkstra, Khutuck, Zkhalido, Viztor, Wenyi, Tbscho, MayS, Mdupont, JJMC89,
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