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authorRichard van der Hoff <richard@matrix.org>2020-04-23 18:19:08 +0100
committerRichard van der Hoff <richard@matrix.org>2020-04-24 13:59:21 +0100
commitce428a1abe6aae25e236baf268f56b1811cba333 (patch)
tree17397b3c6a3bb3b6b68fbf1c4f30f971984293c9 /tests/federation
parentMake it clear that the limit for an update_function is a target (diff)
downloadsynapse-ce428a1abe6aae25e236baf268f56b1811cba333.tar.xz
Fix EventsStream raising assertions when it falls behind
Figuring out how to correctly limit updates from this stream without dropping
entries is far more complicated than just counting the number of rows being
returned. We need to consider each query separately and, if any one query hits
the limit, truncate the results from the others.

I think this also fixes some potentially long-standing bugs where events or
state changes could get missed if we hit the limit on either query.
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