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Merge pull request #1065 from matrix-org/erikj/state_storage

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Move to storing state_groups_state as deltas
This commit is contained in:
Erik Johnston 2016-09-07 09:39:58 +01:00 committed by GitHub
commit 94a83b534f
8 changed files with 487 additions and 78 deletions
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21
synapse/events/snapshot.py
View File

@ -15,9 +15,30 @@
class EventContext(object):
__slots__ = [
"current_state_ids",
"prev_state_ids",
"state_group",
"rejected",
"push_actions",
"prev_group",
"delta_ids",
"prev_state_events",
]
def __init__(self):
# The current state including the current event
self.current_state_ids = None
# The current state excluding the current event
self.prev_state_ids = None
self.state_group = None
self.rejected = False
self.push_actions = []
# A previously persisted state group and a delta between that
# and this state.
self.prev_group = None
self.delta_ids = None
self.prev_state_events = None

3
synapse/replication/slave/storage/events.py
View File

@ -86,6 +86,9 @@ class SlavedEventStore(BaseSlavedStore):
_get_state_groups_from_groups = (
StateStore.__dict__["_get_state_groups_from_groups"]
)
_get_state_groups_from_groups_txn = (
DataStore._get_state_groups_from_groups_txn.__func__
)
_get_state_group_from_group = (
StateStore.__dict__["_get_state_group_from_group"]
)

33
synapse/state.py
View File

@ -55,12 +55,15 @@ def _gen_state_id():
class _StateCacheEntry(object):
__slots__ = ["state", "state_group", "state_id"]
__slots__ = ["state", "state_group", "state_id", "prev_group", "delta_ids"]
def __init__(self, state, state_group):
def __init__(self, state, state_group, prev_group=None, delta_ids=None):
self.state = state
self.state_group = state_group
self.prev_group = prev_group
self.delta_ids = delta_ids
# The `state_id` is a unique ID we generate that can be used as ID for
# this collection of state. Usually this would be the same as the
# state group, but on worker instances we can't generate a new state
@ -245,11 +248,20 @@ class StateHandler(object):
if key in context.prev_state_ids:
replaces = context.prev_state_ids[key]
event.unsigned["replaces_state"] = replaces
context.current_state_ids = dict(context.prev_state_ids)
context.current_state_ids[key] = event.event_id
context.prev_group = entry.prev_group
context.delta_ids = entry.delta_ids
if context.delta_ids is not None:
context.delta_ids[key] = event.event_id
else:
context.current_state_ids = context.prev_state_ids
context.prev_group = entry.prev_group
context.delta_ids = entry.delta_ids
context.prev_state_events = []
defer.returnValue(context)
@ -283,6 +295,8 @@ class StateHandler(object):
defer.returnValue(_StateCacheEntry(
state=state_list,
state_group=name,
prev_group=name,
delta_ids={},
))
with (yield self.resolve_linearizer.queue(group_names)):
@ -340,9 +354,24 @@ class StateHandler(object):
if hasattr(self.store, "get_next_state_group"):
state_group = self.store.get_next_state_group()
prev_group = None
delta_ids = None
for old_group, old_ids in state_groups_ids.items():
if not set(new_state.iterkeys()) - set(old_ids.iterkeys()):
n_delta_ids = {
k: v
for k, v in new_state.items()
if old_ids.get(k) != v
}
if not delta_ids or len(n_delta_ids) < len(delta_ids):
prev_group = old_group
delta_ids = n_delta_ids
cache = _StateCacheEntry(
state=new_state,
state_group=state_group,
prev_group=prev_group,
delta_ids=delta_ids,
)
if self._state_cache is not None:

66
synapse/storage/events.py
View File

@ -497,7 +497,11 @@ class EventsStore(SQLBaseStore):
# insert into the state_group, state_groups_state and
# event_to_state_groups tables.
try:
self._store_mult_state_groups_txn(txn, ((event, context),))
except Exception:
logger.exception("")
raise
metadata_json = encode_json(
event.internal_metadata.get_dict()
@ -1543,6 +1547,9 @@ class EventsStore(SQLBaseStore):
)
event_rows = txn.fetchall()
for event_id, state_key in event_rows:
txn.call_after(self._get_state_group_for_event.invalidate, (event_id,))
# We calculate the new entries for the backward extremeties by finding
# all events that point to events that are to be purged
txn.execute(
@ -1582,7 +1589,66 @@ class EventsStore(SQLBaseStore):
" GROUP BY state_group HAVING MAX(topological_ordering) < ?",
(room_id, topological_ordering, topological_ordering)
)
state_rows = txn.fetchall()
state_groups_to_delete = [sg for sg, in state_rows]
# Now we get all the state groups that rely on these state groups
new_state_edges = []
chunks = [
state_groups_to_delete[i:i + 100]
for i in xrange(0, len(state_groups_to_delete), 100)
]
for chunk in chunks:
rows = self._simple_select_many_txn(
txn,
table="state_group_edges",
column="prev_state_group",
iterable=chunk,
retcols=["state_group"],
keyvalues={},
)
new_state_edges.extend(row["state_group"] for row in rows)
# Now we turn the state groups that reference to-be-deleted state groups
# to non delta versions.
for new_state_edge in new_state_edges:
curr_state = self._get_state_groups_from_groups_txn(
txn, [new_state_edge], types=None
)
curr_state = curr_state[new_state_edge]
self._simple_delete_txn(
txn,
table="state_groups_state",
keyvalues={
"state_group": new_state_edge,
}
)
self._simple_delete_txn(
txn,
table="state_group_edges",
keyvalues={
"state_group": new_state_edge,
}
)
self._simple_insert_many_txn(
txn,
table="state_groups_state",
values=[
{
"state_group": new_state_edge,
"room_id": room_id,
"type": key[0],
"state_key": key[1],
"event_id": state_id,
}
for key, state_id in curr_state.items()
],
)
txn.executemany(
"DELETE FROM state_groups_state WHERE state_group = ?",
state_rows

2
synapse/storage/prepare_database.py
View File

@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
# Remember to update this number every time a change is made to database
# schema files, so the users will be informed on server restarts.
SCHEMA_VERSION = 34
SCHEMA_VERSION = 35
dir_path = os.path.abspath(os.path.dirname(__file__))

22
synapse/storage/schema/delta/35/state.sql Normal file
View File

@ -0,0 +1,22 @@
/* Copyright 2016 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
CREATE TABLE state_group_edges(
state_group BIGINT NOT NULL,
prev_state_group BIGINT NOT NULL
);
CREATE INDEX state_group_edges_idx ON state_group_edges(state_group);
CREATE INDEX state_group_edges_prev_idx ON state_group_edges(prev_state_group);

17
synapse/storage/schema/delta/35/state_dedupe.sql Normal file
View File

@ -0,0 +1,17 @@
/* Copyright 2016 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
INSERT into background_updates (update_name, progress_json)
VALUES ('state_group_state_deduplication', '{}');

355
synapse/storage/state.py
View File

@ -16,6 +16,7 @@
from ._base import SQLBaseStore
from synapse.util.caches.descriptors import cached, cachedList
from synapse.util.caches import intern_string
from synapse.storage.engines import PostgresEngine
from twisted.internet import defer
@ -24,6 +25,9 @@ import logging
logger = logging.getLogger(__name__)
MAX_STATE_DELTA_HOPS = 100
class StateStore(SQLBaseStore):
""" Keeps track of the state at a given event.
@ -43,6 +47,15 @@ class StateStore(SQLBaseStore):
* `state_groups_state`: Maps state group to state events.
"""
STATE_GROUP_DEDUPLICATION_UPDATE_NAME = "state_group_state_deduplication"
def __init__(self, hs):
super(StateStore, self).__init__(hs)
self.register_background_update_handler(
self.STATE_GROUP_DEDUPLICATION_UPDATE_NAME,
self._background_deduplicate_state,
)
@defer.inlineCallbacks
def get_state_groups_ids(self, room_id, event_ids):
if not event_ids:
@ -103,11 +116,8 @@ class StateStore(SQLBaseStore):
state_groups[event.event_id] = context.state_group
if self._have_persisted_state_group_txn(txn, context.state_group):
logger.info("Already persisted state_group: %r", context.state_group)
continue
state_event_ids = dict(context.current_state_ids)
self._simple_insert_txn(
txn,
table="state_groups",
@ -118,6 +128,22 @@ class StateStore(SQLBaseStore):
},
)
# We persist as a delta if we can, while also ensuring the chain
# of deltas isn't tooo long, as otherwise read performance degrades.
if context.prev_group:
potential_hops = self._count_state_group_hops_txn(
txn, context.prev_group
)
if context.prev_group and potential_hops < MAX_STATE_DELTA_HOPS:
self._simple_insert_txn(
txn,
table="state_group_edges",
values={
"state_group": context.state_group,
"prev_state_group": context.prev_group,
},
)
self._simple_insert_many_txn(
txn,
table="state_groups_state",
@ -129,7 +155,22 @@ class StateStore(SQLBaseStore):
"state_key": key[1],
"event_id": state_id,
}
for key, state_id in state_event_ids.items()
for key, state_id in context.delta_ids.items()
],
)
else:
self._simple_insert_many_txn(
txn,
table="state_groups_state",
values=[
{
"state_group": context.state_group,
"room_id": event.room_id,
"type": key[0],
"state_key": key[1],
"event_id": state_id,
}
for key, state_id in context.current_state_ids.items()
],
)
@ -145,6 +186,47 @@ class StateStore(SQLBaseStore):
],
)
def _count_state_group_hops_txn(self, txn, state_group):
"""Given a state group, count how many hops there are in the tree.
This is used to ensure the delta chains don't get too long.
"""
if isinstance(self.database_engine, PostgresEngine):
sql = ("""
WITH RECURSIVE state(state_group) AS (
VALUES(?::bigint)
UNION ALL
SELECT prev_state_group FROM state_group_edges e, state s
WHERE s.state_group = e.state_group
)
SELECT count(*) FROM state;
""")
txn.execute(sql, (state_group,))
row = txn.fetchone()
if row and row[0]:
return row[0]
else:
return 0
else:
# We don't use WITH RECURSIVE on sqlite3 as there are distributions
# that ship with an sqlite3 version that doesn't support it (e.g. wheezy)
next_group = state_group
count = 0
while next_group:
next_group = self._simple_select_one_onecol_txn(
txn,
table="state_group_edges",
keyvalues={"state_group": next_group},
retcol="prev_state_group",
allow_none=True,
)
if next_group:
count += 1
return count
@defer.inlineCallbacks
def get_current_state(self, room_id, event_type=None, state_key=""):
if event_type and state_key is not None:
@ -206,7 +288,19 @@ class StateStore(SQLBaseStore):
def _get_state_groups_from_groups(self, groups, types):
"""Returns dictionary state_group -> (dict of (type, state_key) -> event id)
"""
def f(txn, groups):
results = {}
chunks = [groups[i:i + 100] for i in xrange(0, len(groups), 100)]
for chunk in chunks:
res = yield self.runInteraction(
"_get_state_groups_from_groups",
self._get_state_groups_from_groups_txn, chunk, types,
)
results.update(res)
defer.returnValue(results)
def _get_state_groups_from_groups_txn(self, txn, groups, types=None):
if types is not None:
where_clause = "AND (%s)" % (
" OR ".join(["(type = ? AND state_key = ?)"] * len(types)),
@ -214,39 +308,78 @@ class StateStore(SQLBaseStore):
else:
where_clause = ""
sql = (
"SELECT state_group, event_id, type, state_key"
" FROM state_groups_state WHERE"
" state_group IN (%s) %s" % (
",".join("?" for _ in groups),
where_clause,
results = {group: {} for group in groups}
if isinstance(self.database_engine, PostgresEngine):
# The below query walks the state_group tree so that the "state"
# table includes all state_groups in the tree. It then joins
# against `state_groups_state` to fetch the latest state.
# It assumes that previous state groups are always numerically
# lesser.
sql = ("""
WITH RECURSIVE state(state_group) AS (
VALUES(?::bigint)
UNION ALL
SELECT prev_state_group FROM state_group_edges e, state s
WHERE s.state_group = e.state_group
)
SELECT type, state_key, event_id FROM state_groups_state
WHERE ROW(type, state_key, state_group) IN (
SELECT type, state_key, max(state_group) FROM state
INNER JOIN state_groups_state USING (state_group)
GROUP BY type, state_key
)
%s;
""") % (where_clause,)
args = list(groups)
for group in groups:
args = [group]
if types is not None:
args.extend([i for typ in types for i in typ])
txn.execute(sql, args)
rows = self.cursor_to_dict(txn)
results = {group: {} for group in groups}
for row in rows:
key = (row["type"], row["state_key"])
results[row["state_group"]][key] = row["event_id"]
return results
results[group][key] = row["event_id"]
else:
# We don't use WITH RECURSIVE on sqlite3 as there are distributions
# that ship with an sqlite3 version that doesn't support it (e.g. wheezy)
for group in groups:
group_tree = [group]
next_group = group
results = {}
chunks = [groups[i:i + 100] for i in xrange(0, len(groups), 100)]
for chunk in chunks:
res = yield self.runInteraction(
"_get_state_groups_from_groups",
f, chunk
while next_group:
next_group = self._simple_select_one_onecol_txn(
txn,
table="state_group_edges",
keyvalues={"state_group": next_group},
retcol="prev_state_group",
allow_none=True,
)
results.update(res)
if next_group:
group_tree.append(next_group)
defer.returnValue(results)
sql = ("""
SELECT type, state_key, event_id FROM state_groups_state
INNER JOIN (
SELECT type, state_key, max(state_group) as state_group
FROM state_groups_state
WHERE state_group IN (%s) %s
GROUP BY type, state_key
) USING (type, state_key, state_group);
""") % (",".join("?" for _ in group_tree), where_clause,)
args = list(group_tree)
if types is not None:
args.extend([i for typ in types for i in typ])
txn.execute(sql, args)
rows = self.cursor_to_dict(txn)
for row in rows:
key = (row["type"], row["state_key"])
results[group][key] = row["event_id"]
return results
@defer.inlineCallbacks
def get_state_for_events(self, event_ids, types):
@ -504,32 +637,150 @@ class StateStore(SQLBaseStore):
defer.returnValue(results)
def get_all_new_state_groups(self, last_id, current_id, limit):
def get_all_new_state_groups_txn(txn):
sql = (
"SELECT id, room_id, event_id FROM state_groups"
" WHERE ? < id AND id <= ? ORDER BY id LIMIT ?"
)
txn.execute(sql, (last_id, current_id, limit))
groups = txn.fetchall()
if not groups:
return ([], [])
lower_bound = groups[0][0]
upper_bound = groups[-1][0]
sql = (
"SELECT state_group, type, state_key, event_id"
" FROM state_groups_state"
" WHERE ? <= state_group AND state_group <= ?"
)
txn.execute(sql, (lower_bound, upper_bound))
state_group_state = txn.fetchall()
return (groups, state_group_state)
return self.runInteraction(
"get_all_new_state_groups", get_all_new_state_groups_txn
)
def get_next_state_group(self):
return self._state_groups_id_gen.get_next()
@defer.inlineCallbacks
def _background_deduplicate_state(self, progress, batch_size):
"""This background update will slowly deduplicate state by reencoding
them as deltas.
"""
last_state_group = progress.get("last_state_group", 0)
rows_inserted = progress.get("rows_inserted", 0)
max_group = progress.get("max_group", None)
BATCH_SIZE_SCALE_FACTOR = 100
batch_size = max(1, int(batch_size / BATCH_SIZE_SCALE_FACTOR))
if max_group is None:
rows = yield self._execute(
"_background_deduplicate_state", None,
"SELECT coalesce(max(id), 0) FROM state_groups",
)
max_group = rows[0][0]
def reindex_txn(txn):
new_last_state_group = last_state_group
for count in xrange(batch_size):
txn.execute(
"SELECT id, room_id FROM state_groups"
" WHERE ? < id AND id <= ?"
" ORDER BY id ASC"
" LIMIT 1",
(new_last_state_group, max_group,)
)
row = txn.fetchone()
if row:
state_group, room_id = row
if not row or not state_group:
return True, count
txn.execute(
"SELECT state_group FROM state_group_edges"
" WHERE state_group = ?",
(state_group,)
)
# If we reach a point where we've already started inserting
# edges we should stop.
if txn.fetchall():
return True, count
txn.execute(
"SELECT coalesce(max(id), 0) FROM state_groups"
" WHERE id < ? AND room_id = ?",
(state_group, room_id,)
)
prev_group, = txn.fetchone()
new_last_state_group = state_group
if prev_group:
potential_hops = self._count_state_group_hops_txn(
txn, prev_group
)
if potential_hops >= MAX_STATE_DELTA_HOPS:
# We want to ensure chains are at most this long,#
# otherwise read performance degrades.
continue
prev_state = self._get_state_groups_from_groups_txn(
txn, [prev_group], types=None
)
prev_state = prev_state[prev_group]
curr_state = self._get_state_groups_from_groups_txn(
txn, [state_group], types=None
)
curr_state = curr_state[state_group]
if not set(prev_state.keys()) - set(curr_state.keys()):
# We can only do a delta if the current has a strict super set
# of keys
delta_state = {
key: value for key, value in curr_state.items()
if prev_state.get(key, None) != value
}
self._simple_delete_txn(
txn,
table="state_group_edges",
keyvalues={
"state_group": state_group,
}
)
self._simple_insert_txn(
txn,
table="state_group_edges",
values={
"state_group": state_group,
"prev_state_group": prev_group,
}
)
self._simple_delete_txn(
txn,
table="state_groups_state",
keyvalues={
"state_group": state_group,
}
)
self._simple_insert_many_txn(
txn,
table="state_groups_state",
values=[
{
"state_group": state_group,
"room_id": room_id,
"type": key[0],
"state_key": key[1],
"event_id": state_id,
}
for key, state_id in delta_state.items()
],
)
progress = {
"last_state_group": state_group,
"rows_inserted": rows_inserted + batch_size,
"max_group": max_group,
}
self._background_update_progress_txn(
txn, self.STATE_GROUP_DEDUPLICATION_UPDATE_NAME, progress
)
return False, batch_size
finished, result = yield self.runInteraction(
self.STATE_GROUP_DEDUPLICATION_UPDATE_NAME, reindex_txn
)
if finished:
yield self._end_background_update(self.STATE_GROUP_DEDUPLICATION_UPDATE_NAME)
defer.returnValue(result * BATCH_SIZE_SCALE_FACTOR)