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Editorial Team
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Asked: 2026-06-03T07:26:12+00:00

According to the Google App Engine documentation, writing to one entity group is limited

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According to the Google App Engine documentation, writing to one entity group is limited to one write per second when using High Replication Datastore. So…

  1. What happens if I exceed this limit? Some kind of exception? And what should I do?
  2. How do I know that I’m close to exceeding this limit? I can design the application in a way that particular actions (adding an entity…) are not likely to happen often but naturally I can’t guarantee that.
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1 Answer

  1. Editorial Team

    one write per second is a little low. it actually supports more than that. i would even say between 5 and 10 writes per second but i can’t guarantee that of course.

    if you hit that limit you will get an exception yes. the exception message will be:
    Too much contention on these datastore entities. please try again.

    but i don’t know/remember the exact Exception that will raise.

    you have the choice to retry, continue or whatever else you think is right to to at that point.

    you can’t tell if you are close to a 1 write per second limit. it happens and you deal with it.

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