Comments (13)
https://wavereactor.appspot.com/ works from here. Please provide more detail
on how you got the error. Is it your own server? Are you running locally or
did you deploy to App Engine? Can you take a look at the log messages to see
if anything stands out?
Original comment by [email protected]
on 23 Nov 2011 at 8:13
from walkaround.
A friend sent me a link https://walk-test.appspot.com/inbox which I clicked.
The site loaded in my browser, Firefox; all I got was Error 500.
Just tried the link again - works this time. So a momentary error, it seems.
Original comment by [email protected]
on 23 Nov 2011 at 8:33
from walkaround.
Issue 8 has been merged into this issue.
Original comment by [email protected]
on 23 Nov 2011 at 9:46
from walkaround.
Issue 11 has been merged into this issue.
Original comment by [email protected]
on 24 Nov 2011 at 5:55
from walkaround.
Matt, can you take a look at the walk-test logs to check what the errors are?
Original comment by [email protected]
on 24 Nov 2011 at 5:56
from walkaround.
I've seen my own instance get close to its datastore read quota, and if that's
exceeded, I'm pretty sure the result would be a server error 500. So I assume
that's what happened here.
It shouldn't be too hard to avoid most of our datastore reads by keeping
AccountRecords and current object versions in memcache.
Original comment by [email protected]
on 1 Dec 2011 at 6:59
- Changed title: Error 500 (datastore read quota exceeded, need to use memcache more)
- Changed state: Accepted
from walkaround.
Issue 12 has been merged into this issue.
Original comment by [email protected]
on 1 Dec 2011 at 6:59
from walkaround.
High priority since people are really hitting the quota, see
http://code.google.com/p/walkaround/issues/detail?id=31#c2 .
Original comment by [email protected]
on 4 Jan 2012 at 12:22
- Added labels: Priority-High
- Removed labels: Priority-Medium
from walkaround.
I added caching for OAuth credentials. Still need to make sure /channel can be
served without datastore reads in the typical case.
Original comment by [email protected]
on 4 Jan 2012 at 7:40
- Added labels: Component-Slob
from walkaround.
I have implemented Walkaround on appspot and I am noticing a similar trend. I
made a new wave, added a participant, they viewed the page on another computer
while I typed a single sentence into wave. Apparently this took 15k read
operations to do, as before I created this new wave I was at 23% of 0.5m read
operations, and I was 26% immediately after. It was just us two on the wave and
no other viewing/editing/anything occurred in the time between the read
operation dashboard update.
Appspot gives a 500 error when out of resources, so it's very likely that this
is related.
Original comment by [email protected]
on 6 Jan 2012 at 6:01
from walkaround.
I am working on this now; but your measurement of 15k read operations doesn't
seem plausible. I ran a similar test (typing the text "Hello world. This is a
test. Can you read this? How many datastore operations does this take?" into
a wave while the wave is open in another browser window), and it took ~1500
"datastore entity fetch ops" – more than it should, but an order of magnitude
less than you saw.
After running this experiment twice (and not much else), the datastore stats on
my test instance are:
Datastore Entity Fetch Ops 3,201
Datastore Entity Put Ops 274
Datastore Entity Delete Ops 0
Datastore Index Write Ops 1,463
Datastore Query Ops 394
Original comment by [email protected]
on 8 Jan 2012 at 9:57
from walkaround.
I can't seem to reproduce the high measurement anymore, though I could two days
ago. I've changed nothing between now and then - I haven't even accessed
Appspot until today. now I am getting results along the lines of yours.
I will discard my previous message as a fluke for now. If I can reproduce the
results or find what caused that many reads, I will reply with more information.
Original comment by [email protected]
on 9 Jan 2012 at 2:24
from walkaround.
My recent changes made big improvements in this area, please try them out.
Walkaround should be a lot more resource-efficient now; the above test no
longer needs 1500 fetch ops, but only 70.
I think the problem with your calculation earlier was that you assumed a quota
of 0.5m ops, but the free quota is 0.05m ops per day. That's why you were off
by an order of magnitude.
Original comment by [email protected]
on 10 Jan 2012 at 12:09
- Changed state: Fixed
from walkaround.
Related Issues (20)
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