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Track unconverted device list outbound pokes using a position instead (#14516)

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When a local device list change is added to
`device_lists_changes_in_room`, the `converted_to_destinations` flag is
set to `FALSE` and the `_handle_new_device_update_async` background
process is started. This background process looks for unconverted rows
in `device_lists_changes_in_room`, copies them to
`device_lists_outbound_pokes` and updates the flag.

To update the `converted_to_destinations` flag, the database performs a
`DELETE` and `INSERT` internally, which fragments the table. To avoid
this, track unconverted rows using a `(stream ID, room ID)` position
instead of the flag.

From now on, the `converted_to_destinations` column indicates rows that
need converting to outbound pokes, but does not indicate whether the
conversion has already taken place.

Closes #14037.

Signed-off-by: Sean Quah <seanq@matrix.org>
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Sean Quah 2022-11-22 16:46:52 +00:00 • committed by GitHub
parent 7eb7460042
commit 9cae44f49e
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6 changed files with 158 additions and 49 deletions
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13
synapse/storage/database.py
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@ -2075,13 +2075,14 @@ class DatabasePool:
retcols: Collection[str],
allow_none: bool = False,
) -> Optional[Dict[str, Any]]:
select_sql = "SELECT %s FROM %s WHERE %s" % (
", ".join(retcols),
table,
" AND ".join("%s = ?" % (k,) for k in keyvalues),
)
select_sql = "SELECT %s FROM %s" % (", ".join(retcols), table)
if keyvalues:
select_sql += " WHERE %s" % (" AND ".join("%s = ?" % k for k in keyvalues),)
txn.execute(select_sql, list(keyvalues.values()))
else:
txn.execute(select_sql)
txn.execute(select_sql, list(keyvalues.values()))
row = txn.fetchone()
if not row: