I have an app that once a day does a big data processing task.
Every now and then it would throw a datastore timeout error. But now it's
throwing them constantly.
I thought maybe my data had tripped over some limit on how much you can read,
but I just added some instrumentation and it's only reading less than half of
the entities. If I was tripping over an undocumented limit, I'd think it would
read all most all of them (since only a few get added each day).
Basically, the code is simply:
for h in HitModel.all():
(do collect up info about h)
and there are about 85K HitModel objects in the database. It's dying after
reading 35,000 of them (which takes about a minute).
It's on HR data store. Still on Python 2.5.
App ID is "kaon-log"
The error I'm getting is:
2014-10-07 11:16:46.925
The datastore operation timed out, or the data was temporarily unavailable.
Traceback (most recent call last):
File
"/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/ext/webapp/_webapp25.py",
line 714, in __call__
handler.get(*groups)
File "/base/data/home/apps/s~kaon-log/33.379217403803985923/main.py", line
648, in get
for h in HitModel.all():
File
"/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/ext/db/__init__.py",
line 2326, in next
return self.__model_class.from_entity(self.__iterator.next())
File
"/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/datastore/datastore_query.py",
line 3091, in next
next_batch = self.__batcher.next_batch(Batcher.AT_LEAST_OFFSET)
File
"/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/datastore/datastore_query.py",
line 2977, in next_batch
batch = self.__next_batch.get_result()
File
"/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/api/apiproxy_stub_map.py",
line 612, in get_result
return self.__get_result_hook(self)
File
"/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/datastore/datastore_query.py",
line 2710, in __query_result_hook
self._batch_shared.conn.check_rpc_success(rpc)
File
"/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/datastore/datastore_rpc.py",
line 1333, in check_rpc_success
raise _ToDatastoreError(err)
Timeout: The datastore operation timed out, or the data was temporarily
unavailable.
Any ideas?
(Breaking this up into multiple tasks would be really hard.)
-Joshua
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