I believe the issue is that memcache is non-blocking; the write may not complete before you try to read, and instead of blocking waiting for the write to finish memcache returns a None value to the read request.
On Feb 7, 6:22 am, observer247 <[email protected]> wrote: > This is my code: > > ret = memcache.add(key=mykey, value=qList, time= > 60*60*24*30) > logging.critical("Created cache batch %s Passed %s" % > (mykey, str(ret))) > > qList = memcache.get(mykey) > > For some reason, qList is None ! I have logged all values and qList is > a non empty list. Check code below where I print a lot of info in the > logs. > > Detailed code here: > > def MY_QC_MAX(): return 3 > def MY_QC_SIZE(): return 200 > > def createBatchMyModels(): > import random > for n in range(MY_QC_MAX()): > bnum = n + 1 > mykey = "qkey_batch_"+str(bnum) > qQ = MyModel.all(keys_only=True).filter('approved', > True) > if bnum > 1: > qQ = qQ.filter('__key__ >', last_key) > rows = qQ.fetch(MY_QC_SIZE()) > tot = len(rows) > if tot < MY_QC_SIZE(): > logging.critical("Not enough MyModels for > batch %u, got %u" % (bnum, tot)) > if tot == 0: > return > last_key = rows[tot - 1] > # create the qList > qList = list() > logging.critical("Added %u rows into key %s" % (tot, > mykey)) > tmpc = 0 > for r in rows: > if tmpc == 0: > logging.critical("elem %u into key %s" > % (r.id(), mykey)) > tmpc = tmpc + 1 > qList.append(r.id()) > > for elem in qList: > logging.info("key %s elem is %u" % (mykey, > elem)) > memcache.delete(mykey) > ret = memcache.add(key=mykey, value=qList, time= > 60*60*24*30) > logging.critical("Created cache batch %s Passed %s" % > (mykey, str(ret))) > > qList = memcache.get(mykey) > if qList is None: > logging.critical(".. getNextMyModel: Did not > find key %s" % mykey) > else: > logging.critical(".. LEN : %u" % len(qList)) > > Sample log: > ..... > 02-07 03:15AM 05.240 key qkey_batch_1 elem is 13108 > C 02-07 03:15AM 05.250 Created cache batch qkey_batch_1 Passed True > C 02-07 03:15AM 05.253 .. getNextQuestion: Did not find key > qkey_batch_1 > C 02-07 03:15AM 05.339 Added 200 rows into key qkey_batch_2 > ... > > Can anyone pls help ! -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
