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authorErik Johnston <erik@matrix.org>2020-08-19 10:39:31 +0100
committerGitHub <noreply@github.com>2020-08-19 10:39:31 +0100
commit76d21d14a042756b0c8a8f520dfd9ea09cf092c7 (patch)
tree8d24252c5e3bdcff215a8536da4bec429fd6fbbd /synapse/util
parentConvert events worker database to async/await. (#8071) (diff)
downloadsynapse-76d21d14a042756b0c8a8f520dfd9ea09cf092c7.tar.xz
Separate `get_current_token` into two. (#8113)
The function is used for two purposes: 1) for subscribers of streams to
get a token they can use to get further updates with, and 2) for
replication to track position of the writers of the stream.

For streams with a single writer the two scenarios produce the same
result, however the situation becomes complicated for streams with
multiple writers. The current `MultiWriterIdGenerator` does not
correctly handle the first case (which is not an issue as its only used
for the `caches` stream which nothing subscribes to outside of
replication).
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