We started with a model with just over 300,000 entities. We ran a
mapper job and deleted almost all, leaving only 1,500. This took about
45 minutes.

However, after the job was complete, any queries based on a composite
index over that model became effectively unresponsive for around 2
hours. That is, almost all requests for queries to that composite
index resulted in a DeadlineExceededError.

Is this expected behaviour? If so, should we be throttling mapper jobs
that do large deletions?

Thanks,
j

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