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https://mau.dev/maunium/synapse.git
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![Sean Quah](/assets/img/avatar_default.png)
When Synapse is terminated while running the background update to create the `receipts_graph` or `receipts_linearized` indexes, the indexes may be successfully created (or marked as invalid on postgres) while the background update remains unfinished. When Synapse next starts up, the background update will fail because the index already exists, or exists but is invalid on postgres. Use the existing code to create indices in background updates, since it handles these edge cases. Signed-off-by: Sean Quah <seanq@matrix.org>
724 lines
26 KiB
Python
724 lines
26 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from types import TracebackType
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from typing import (
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TYPE_CHECKING,
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Any,
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AsyncContextManager,
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Awaitable,
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Callable,
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Dict,
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Iterable,
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List,
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Optional,
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Type,
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)
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import attr
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.storage.types import Connection, Cursor
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from synapse.types import JsonDict
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from synapse.util import Clock, json_encoder
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from . import engines
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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from synapse.storage.database import DatabasePool, LoggingTransaction
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logger = logging.getLogger(__name__)
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ON_UPDATE_CALLBACK = Callable[[str, str, bool], AsyncContextManager[int]]
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DEFAULT_BATCH_SIZE_CALLBACK = Callable[[str, str], Awaitable[int]]
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MIN_BATCH_SIZE_CALLBACK = Callable[[str, str], Awaitable[int]]
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class _BackgroundUpdateHandler:
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"""A handler for a given background update.
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Attributes:
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callback: The function to call to make progress on the background
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update.
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oneshot: Wether the update is likely to happen all in one go, ignoring
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the supplied target duration, e.g. index creation. This is used by
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the update controller to help correctly schedule the update.
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"""
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callback: Callable[[JsonDict, int], Awaitable[int]]
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oneshot: bool = False
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class _BackgroundUpdateContextManager:
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def __init__(
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self, sleep: bool, clock: Clock, sleep_duration_ms: int, update_duration: int
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):
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self._sleep = sleep
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self._clock = clock
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self._sleep_duration_ms = sleep_duration_ms
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self._update_duration_ms = update_duration
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async def __aenter__(self) -> int:
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if self._sleep:
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await self._clock.sleep(self._sleep_duration_ms / 1000)
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return self._update_duration_ms
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async def __aexit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc: Optional[BaseException],
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tb: Optional[TracebackType],
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) -> None:
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pass
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class BackgroundUpdatePerformance:
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"""Tracks the how long a background update is taking to update its items"""
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def __init__(self, name: str):
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self.name = name
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self.total_item_count = 0
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self.total_duration_ms = 0.0
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self.avg_item_count = 0.0
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self.avg_duration_ms = 0.0
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def update(self, item_count: int, duration_ms: float) -> None:
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"""Update the stats after doing an update"""
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self.total_item_count += item_count
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self.total_duration_ms += duration_ms
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# Exponential moving averages for the number of items updated and
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# the duration.
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self.avg_item_count += 0.1 * (item_count - self.avg_item_count)
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self.avg_duration_ms += 0.1 * (duration_ms - self.avg_duration_ms)
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def average_items_per_ms(self) -> Optional[float]:
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"""An estimate of how long it takes to do a single update.
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Returns:
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A duration in ms as a float
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"""
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# We want to return None if this is the first background update item
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if self.total_item_count == 0:
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return None
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# Avoid dividing by zero
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elif self.avg_duration_ms == 0:
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return 0
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else:
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# Use the exponential moving average so that we can adapt to
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# changes in how long the update process takes.
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return float(self.avg_item_count) / float(self.avg_duration_ms)
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def total_items_per_ms(self) -> Optional[float]:
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"""An estimate of how long it takes to do a single update.
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Returns:
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A duration in ms as a float
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"""
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if self.total_duration_ms == 0:
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return 0
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elif self.total_item_count == 0:
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return None
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else:
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return float(self.total_item_count) / float(self.total_duration_ms)
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class BackgroundUpdater:
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"""Background updates are updates to the database that run in the
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background. Each update processes a batch of data at once. We attempt to
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limit the impact of each update by monitoring how long each batch takes to
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process and autotuning the batch size.
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"""
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def __init__(self, hs: "HomeServer", database: "DatabasePool"):
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self._clock = hs.get_clock()
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self.db_pool = database
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self._database_name = database.name()
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# if a background update is currently running, its name.
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self._current_background_update: Optional[str] = None
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self._on_update_callback: Optional[ON_UPDATE_CALLBACK] = None
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self._default_batch_size_callback: Optional[DEFAULT_BATCH_SIZE_CALLBACK] = None
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self._min_batch_size_callback: Optional[MIN_BATCH_SIZE_CALLBACK] = None
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self._background_update_performance: Dict[str, BackgroundUpdatePerformance] = {}
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self._background_update_handlers: Dict[str, _BackgroundUpdateHandler] = {}
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self._all_done = False
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# Whether we're currently running updates
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self._running = False
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# Whether background updates are enabled. This allows us to
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# enable/disable background updates via the admin API.
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self.enabled = True
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self.minimum_background_batch_size = hs.config.background_updates.min_batch_size
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self.default_background_batch_size = (
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hs.config.background_updates.default_batch_size
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)
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self.update_duration_ms = hs.config.background_updates.update_duration_ms
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self.sleep_duration_ms = hs.config.background_updates.sleep_duration_ms
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self.sleep_enabled = hs.config.background_updates.sleep_enabled
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def register_update_controller_callbacks(
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self,
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on_update: ON_UPDATE_CALLBACK,
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default_batch_size: Optional[DEFAULT_BATCH_SIZE_CALLBACK] = None,
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min_batch_size: Optional[DEFAULT_BATCH_SIZE_CALLBACK] = None,
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) -> None:
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"""Register callbacks from a module for each hook."""
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if self._on_update_callback is not None:
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logger.warning(
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"More than one module tried to register callbacks for controlling"
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" background updates. Only the callbacks registered by the first module"
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" (in order of appearance in Synapse's configuration file) that tried to"
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" do so will be called."
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)
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return
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self._on_update_callback = on_update
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if default_batch_size is not None:
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self._default_batch_size_callback = default_batch_size
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if min_batch_size is not None:
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self._min_batch_size_callback = min_batch_size
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def _get_context_manager_for_update(
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self,
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sleep: bool,
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update_name: str,
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database_name: str,
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oneshot: bool,
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) -> AsyncContextManager[int]:
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"""Get a context manager to run a background update with.
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If a module has registered a `update_handler` callback, use the context manager
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it returns.
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Otherwise, returns a context manager that will return a default value, optionally
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sleeping if needed.
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Args:
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sleep: Whether we can sleep between updates.
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update_name: The name of the update.
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database_name: The name of the database the update is being run on.
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oneshot: Whether the update will complete all in one go, e.g. index creation.
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In such cases the returned target duration is ignored.
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Returns:
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The target duration in milliseconds that the background update should run for.
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Note: this is a *target*, and an iteration may take substantially longer or
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shorter.
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"""
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if self._on_update_callback is not None:
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return self._on_update_callback(update_name, database_name, oneshot)
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return _BackgroundUpdateContextManager(
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sleep, self._clock, self.sleep_duration_ms, self.update_duration_ms
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)
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async def _default_batch_size(self, update_name: str, database_name: str) -> int:
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"""The batch size to use for the first iteration of a new background
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update.
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"""
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if self._default_batch_size_callback is not None:
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return await self._default_batch_size_callback(update_name, database_name)
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return self.default_background_batch_size
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async def _min_batch_size(self, update_name: str, database_name: str) -> int:
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"""A lower bound on the batch size of a new background update.
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Used to ensure that progress is always made. Must be greater than 0.
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"""
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if self._min_batch_size_callback is not None:
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return await self._min_batch_size_callback(update_name, database_name)
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return self.minimum_background_batch_size
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def get_current_update(self) -> Optional[BackgroundUpdatePerformance]:
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"""Returns the current background update, if any."""
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update_name = self._current_background_update
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if not update_name:
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return None
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perf = self._background_update_performance.get(update_name)
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if not perf:
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perf = BackgroundUpdatePerformance(update_name)
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return perf
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def start_doing_background_updates(self) -> None:
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if self.enabled:
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# if we start a new background update, not all updates are done.
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self._all_done = False
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sleep = self.sleep_enabled
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run_as_background_process(
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"background_updates", self.run_background_updates, sleep
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)
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async def run_background_updates(self, sleep: bool) -> None:
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if self._running or not self.enabled:
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return
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self._running = True
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back_to_back_failures = 0
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try:
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logger.info(
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"Starting background schema updates for database %s",
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self._database_name,
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)
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while self.enabled:
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try:
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result = await self.do_next_background_update(sleep)
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back_to_back_failures = 0
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except Exception:
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back_to_back_failures += 1
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if back_to_back_failures >= 5:
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raise RuntimeError(
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"5 back-to-back background update failures; aborting."
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)
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logger.exception("Error doing update")
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else:
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if result:
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logger.info(
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"No more background updates to do."
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" Unscheduling background update task."
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)
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self._all_done = True
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return None
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finally:
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self._running = False
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async def has_completed_background_updates(self) -> bool:
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"""Check if all the background updates have completed
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Returns:
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True if all background updates have completed
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"""
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# if we've previously determined that there is nothing left to do, that
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# is easy
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if self._all_done:
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return True
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# obviously, if we are currently processing an update, we're not done.
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if self._current_background_update:
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return False
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# otherwise, check if there are updates to be run. This is important,
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# as we may be running on a worker which doesn't perform the bg updates
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# itself, but still wants to wait for them to happen.
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updates = await self.db_pool.simple_select_onecol(
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"background_updates",
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keyvalues=None,
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retcol="1",
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desc="has_completed_background_updates",
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)
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if not updates:
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self._all_done = True
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return True
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return False
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async def has_completed_background_update(self, update_name: str) -> bool:
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"""Check if the given background update has finished running."""
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if self._all_done:
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return True
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if update_name == self._current_background_update:
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return False
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update_exists = await self.db_pool.simple_select_one_onecol(
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"background_updates",
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keyvalues={"update_name": update_name},
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retcol="1",
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desc="has_completed_background_update",
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allow_none=True,
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)
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return not update_exists
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async def do_next_background_update(self, sleep: bool = True) -> bool:
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"""Does some amount of work on the next queued background update
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Returns once some amount of work is done.
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Args:
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sleep: Whether to limit how quickly we run background updates or
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not.
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Returns:
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True if we have finished running all the background updates, otherwise False
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"""
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def get_background_updates_txn(txn: Cursor) -> List[Dict[str, Any]]:
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txn.execute(
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"""
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SELECT update_name, depends_on FROM background_updates
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ORDER BY ordering, update_name
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"""
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)
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return self.db_pool.cursor_to_dict(txn)
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if not self._current_background_update:
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all_pending_updates = await self.db_pool.runInteraction(
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"background_updates",
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get_background_updates_txn,
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)
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if not all_pending_updates:
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# no work left to do
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return True
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# find the first update which isn't dependent on another one in the queue.
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pending = {update["update_name"] for update in all_pending_updates}
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for upd in all_pending_updates:
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depends_on = upd["depends_on"]
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if not depends_on or depends_on not in pending:
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break
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logger.info(
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"Not starting on bg update %s until %s is done",
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upd["update_name"],
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depends_on,
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)
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else:
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# if we get to the end of that for loop, there is a problem
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raise Exception(
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"Unable to find a background update which doesn't depend on "
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"another: dependency cycle?"
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)
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self._current_background_update = upd["update_name"]
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# We have a background update to run, otherwise we would have returned
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# early.
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assert self._current_background_update is not None
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update_info = self._background_update_handlers[self._current_background_update]
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async with self._get_context_manager_for_update(
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sleep=sleep,
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update_name=self._current_background_update,
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database_name=self._database_name,
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oneshot=update_info.oneshot,
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) as desired_duration_ms:
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await self._do_background_update(desired_duration_ms)
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return False
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async def _do_background_update(self, desired_duration_ms: float) -> int:
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assert self._current_background_update is not None
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update_name = self._current_background_update
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logger.info("Starting update batch on background update '%s'", update_name)
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update_handler = self._background_update_handlers[update_name].callback
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performance = self._background_update_performance.get(update_name)
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if performance is None:
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performance = BackgroundUpdatePerformance(update_name)
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self._background_update_performance[update_name] = performance
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items_per_ms = performance.average_items_per_ms()
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if items_per_ms is not None:
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batch_size = int(desired_duration_ms * items_per_ms)
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# Clamp the batch size so that we always make progress
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batch_size = max(
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batch_size,
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await self._min_batch_size(update_name, self._database_name),
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)
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else:
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batch_size = await self._default_batch_size(
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update_name, self._database_name
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)
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progress_json = await self.db_pool.simple_select_one_onecol(
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"background_updates",
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keyvalues={"update_name": update_name},
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retcol="progress_json",
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)
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# Avoid a circular import.
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from synapse.storage._base import db_to_json
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progress = db_to_json(progress_json)
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time_start = self._clock.time_msec()
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items_updated = await update_handler(progress, batch_size)
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time_stop = self._clock.time_msec()
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duration_ms = time_stop - time_start
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performance.update(items_updated, duration_ms)
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logger.info(
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"Running background update %r. Processed %r items in %rms."
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" (total_rate=%r/ms, current_rate=%r/ms, total_updated=%r, batch_size=%r)",
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update_name,
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items_updated,
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duration_ms,
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performance.total_items_per_ms(),
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performance.average_items_per_ms(),
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performance.total_item_count,
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batch_size,
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)
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return len(self._background_update_performance)
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def register_background_update_handler(
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self,
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update_name: str,
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update_handler: Callable[[JsonDict, int], Awaitable[int]],
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) -> None:
|
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"""Register a handler for doing a background update.
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The handler should take two arguments:
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* A dict of the current progress
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* An integer count of the number of items to update in this batch.
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The handler should return a deferred or coroutine which returns an integer count
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of items updated.
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The handler is responsible for updating the progress of the update.
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Args:
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update_name: The name of the update that this code handles.
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update_handler: The function that does the update.
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"""
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self._background_update_handlers[update_name] = _BackgroundUpdateHandler(
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update_handler
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)
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def register_background_index_update(
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self,
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update_name: str,
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index_name: str,
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table: str,
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columns: Iterable[str],
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where_clause: Optional[str] = None,
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unique: bool = False,
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psql_only: bool = False,
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replaces_index: Optional[str] = None,
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) -> None:
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"""Helper for store classes to do a background index addition
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|
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To use:
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1. use a schema delta file to add a background update. Example:
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INSERT INTO background_updates (update_name, progress_json) VALUES
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('my_new_index', '{}');
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2. In the Store constructor, call this method
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Args:
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update_name: update_name to register for
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index_name: name of index to add
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table: table to add index to
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columns: columns/expressions to include in index
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where_clause: A WHERE clause to specify a partial unique index.
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unique: true to make a UNIQUE index
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psql_only: true to only create this index on psql databases (useful
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for virtual sqlite tables)
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replaces_index: The name of an index that this index replaces.
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The named index will be dropped upon completion of the new index.
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"""
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async def updater(progress: JsonDict, batch_size: int) -> int:
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await self.create_index_in_background(
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index_name=index_name,
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table=table,
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columns=columns,
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where_clause=where_clause,
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unique=unique,
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psql_only=psql_only,
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replaces_index=replaces_index,
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)
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await self._end_background_update(update_name)
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return 1
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self._background_update_handlers[update_name] = _BackgroundUpdateHandler(
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updater, oneshot=True
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)
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async def create_index_in_background(
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self,
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index_name: str,
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table: str,
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columns: Iterable[str],
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where_clause: Optional[str] = None,
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unique: bool = False,
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psql_only: bool = False,
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replaces_index: Optional[str] = None,
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) -> None:
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|
"""Add an index in the background.
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|
|
|
Args:
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|
update_name: update_name to register for
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|
index_name: name of index to add
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|
table: table to add index to
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|
columns: columns/expressions to include in index
|
|
where_clause: A WHERE clause to specify a partial unique index.
|
|
unique: true to make a UNIQUE index
|
|
psql_only: true to only create this index on psql databases (useful
|
|
for virtual sqlite tables)
|
|
replaces_index: The name of an index that this index replaces.
|
|
The named index will be dropped upon completion of the new index.
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|
"""
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|
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|
def create_index_psql(conn: Connection) -> None:
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conn.rollback()
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# postgres insists on autocommit for the index
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conn.set_session(autocommit=True) # type: ignore
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try:
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c = conn.cursor()
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# If a previous attempt to create the index was interrupted,
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# we may already have a half-built index. Let's just drop it
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# before trying to create it again.
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|
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sql = "DROP INDEX IF EXISTS %s" % (index_name,)
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logger.debug("[SQL] %s", sql)
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c.execute(sql)
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sql = (
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"CREATE %(unique)s INDEX CONCURRENTLY %(name)s"
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" ON %(table)s"
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" (%(columns)s) %(where_clause)s"
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) % {
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"unique": "UNIQUE" if unique else "",
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"name": index_name,
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"table": table,
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|
"columns": ", ".join(columns),
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"where_clause": "WHERE " + where_clause if where_clause else "",
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}
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logger.debug("[SQL] %s", sql)
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|
c.execute(sql)
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|
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if replaces_index is not None:
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# We drop the old index as the new index has now been created.
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|
sql = f"DROP INDEX IF EXISTS {replaces_index}"
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|
logger.debug("[SQL] %s", sql)
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|
c.execute(sql)
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finally:
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conn.set_session(autocommit=False) # type: ignore
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|
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|
def create_index_sqlite(conn: Connection) -> None:
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|
# Sqlite doesn't support concurrent creation of indexes.
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|
#
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|
# We assume that sqlite doesn't give us invalid indices; however
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|
# we may still end up with the index existing but the
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|
# background_updates not having been recorded if synapse got shut
|
|
# down at the wrong moment - hance we use IF NOT EXISTS. (SQLite
|
|
# has supported CREATE TABLE|INDEX IF NOT EXISTS since 3.3.0.)
|
|
sql = (
|
|
"CREATE %(unique)s INDEX IF NOT EXISTS %(name)s ON %(table)s"
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|
" (%(columns)s) %(where_clause)s"
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|
) % {
|
|
"unique": "UNIQUE" if unique else "",
|
|
"name": index_name,
|
|
"table": table,
|
|
"columns": ", ".join(columns),
|
|
"where_clause": "WHERE " + where_clause if where_clause else "",
|
|
}
|
|
|
|
c = conn.cursor()
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|
logger.debug("[SQL] %s", sql)
|
|
c.execute(sql)
|
|
|
|
if replaces_index is not None:
|
|
# We drop the old index as the new index has now been created.
|
|
sql = f"DROP INDEX IF EXISTS {replaces_index}"
|
|
logger.debug("[SQL] %s", sql)
|
|
c.execute(sql)
|
|
|
|
if isinstance(self.db_pool.engine, engines.PostgresEngine):
|
|
runner: Optional[Callable[[Connection], None]] = create_index_psql
|
|
elif psql_only:
|
|
runner = None
|
|
else:
|
|
runner = create_index_sqlite
|
|
|
|
if runner is None:
|
|
return
|
|
|
|
logger.info("Adding index %s to %s", index_name, table)
|
|
await self.db_pool.runWithConnection(runner)
|
|
|
|
async def _end_background_update(self, update_name: str) -> None:
|
|
"""Removes a completed background update task from the queue.
|
|
|
|
Args:
|
|
update_name:: The name of the completed task to remove
|
|
|
|
Returns:
|
|
None, completes once the task is removed.
|
|
"""
|
|
if update_name != self._current_background_update:
|
|
raise Exception(
|
|
"Cannot end background update %s which isn't currently running"
|
|
% update_name
|
|
)
|
|
self._current_background_update = None
|
|
await self.db_pool.simple_delete_one(
|
|
"background_updates", keyvalues={"update_name": update_name}
|
|
)
|
|
|
|
async def _background_update_progress(
|
|
self, update_name: str, progress: dict
|
|
) -> None:
|
|
"""Update the progress of a background update
|
|
|
|
Args:
|
|
update_name: The name of the background update task
|
|
progress: The progress of the update.
|
|
"""
|
|
|
|
await self.db_pool.runInteraction(
|
|
"background_update_progress",
|
|
self._background_update_progress_txn,
|
|
update_name,
|
|
progress,
|
|
)
|
|
|
|
def _background_update_progress_txn(
|
|
self, txn: "LoggingTransaction", update_name: str, progress: JsonDict
|
|
) -> None:
|
|
"""Update the progress of a background update
|
|
|
|
Args:
|
|
txn: The transaction.
|
|
update_name: The name of the background update task
|
|
progress: The progress of the update.
|
|
"""
|
|
|
|
progress_json = json_encoder.encode(progress)
|
|
|
|
self.db_pool.simple_update_one_txn(
|
|
txn,
|
|
"background_updates",
|
|
keyvalues={"update_name": update_name},
|
|
updatevalues={"progress_json": progress_json},
|
|
)
|