Commit graph

7 commits

Author SHA1 Message Date
Erik Johnston
deedb91732
Fix MultiWriterIdGenerator.current_position. (#8257)
It did not correctly handle IDs finishing being persisted out of
order, resulting in the `current_position` lagging until new IDs are
persisted.
2020-09-08 14:26:54 +01:00
Erik Johnston
bbb3c8641c
Make MultiWriterIDGenerator work for streams that use negative stream IDs (#8203)
This is so that we can use it for the backfill events stream.
2020-09-01 13:36:25 +01:00
Erik Johnston
5649b7f3d0
Fix missing _add_persisted_position (#8179)
This was forgotten in #8164.
2020-08-27 13:20:34 +01:00
Erik Johnston
eba98fb024
Add functions to MultiWriterIdGen used by events stream (#8164) 2020-08-25 17:32:30 +01:00
Erik Johnston
76d21d14a0
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).
2020-08-19 10:39:31 +01:00
Erik Johnston
a7bdf98d01
Rename database classes to make some sense (#8033) 2020-08-05 21:38:57 +01:00
Erik Johnston
8123b2f909
Add MultiWriterIdGenerator. (#7281)
This will be used to coordinate stream IDs across multiple writers.

Functions as the equivalent of both `StreamIdGenerator` and
`SlavedIdTracker`.
2020-05-04 17:17:45 +01:00