2fbf695efe
Makes defuncting more efficient when there are many concurrent requests. Also corrects signalling semantics - only accrue one connection error per instance (not one per requests * instance).
716 lines
25 KiB
Python
716 lines
25 KiB
Python
# Copyright 2013-2015 DataStax, Inc.
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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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"""
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Connection pooling and host management.
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"""
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import logging
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import socket
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import time
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from threading import Lock, RLock, Condition
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import weakref
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try:
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from weakref import WeakSet
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except ImportError:
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from cassandra.util import WeakSet # NOQA
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from cassandra import AuthenticationFailed
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from cassandra.connection import ConnectionException
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from cassandra.policies import HostDistance
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log = logging.getLogger(__name__)
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class NoConnectionsAvailable(Exception):
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"""
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All existing connections to a given host are busy, or there are
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no open connections.
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"""
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pass
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class Host(object):
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"""
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Represents a single Cassandra node.
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"""
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address = None
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"""
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The IP address or hostname of the node.
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"""
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conviction_policy = None
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"""
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A :class:`~.ConvictionPolicy` instance for determining when this node should
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be marked up or down.
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"""
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is_up = None
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"""
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:const:`True` if the node is considered up, :const:`False` if it is
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considered down, and :const:`None` if it is not known if the node is
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up or down.
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"""
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_datacenter = None
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_rack = None
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_reconnection_handler = None
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lock = None
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_currently_handling_node_up = False
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def __init__(self, inet_address, conviction_policy_factory, datacenter=None, rack=None):
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if inet_address is None:
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raise ValueError("inet_address may not be None")
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if conviction_policy_factory is None:
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raise ValueError("conviction_policy_factory may not be None")
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self.address = inet_address
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self.conviction_policy = conviction_policy_factory(self)
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self.set_location_info(datacenter, rack)
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self.lock = RLock()
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@property
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def datacenter(self):
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""" The datacenter the node is in. """
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return self._datacenter
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@property
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def rack(self):
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""" The rack the node is in. """
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return self._rack
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def set_location_info(self, datacenter, rack):
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"""
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Sets the datacenter and rack for this node. Intended for internal
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use (by the control connection, which periodically checks the
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ring topology) only.
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"""
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self._datacenter = datacenter
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self._rack = rack
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def set_up(self):
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if not self.is_up:
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log.debug("Host %s is now marked up", self.address)
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self.conviction_policy.reset()
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self.is_up = True
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def set_down(self):
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self.is_up = False
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def signal_connection_failure(self, connection_exc):
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return self.conviction_policy.add_failure(connection_exc)
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def is_currently_reconnecting(self):
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return self._reconnection_handler is not None
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def get_and_set_reconnection_handler(self, new_handler):
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"""
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Atomically replaces the reconnection handler for this
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host. Intended for internal use only.
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"""
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with self.lock:
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old = self._reconnection_handler
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self._reconnection_handler = new_handler
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return old
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def __eq__(self, other):
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return self.address == other.address
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def __hash__(self):
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return hash(self.address)
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def __lt__(self, other):
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return self.address < other.address
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def __str__(self):
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return str(self.address)
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def __repr__(self):
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dc = (" %s" % (self._datacenter,)) if self._datacenter else ""
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return "<%s: %s%s>" % (self.__class__.__name__, self.address, dc)
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class _ReconnectionHandler(object):
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"""
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Abstract class for attempting reconnections with a given
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schedule and scheduler.
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"""
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_cancelled = False
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def __init__(self, scheduler, schedule, callback, *callback_args, **callback_kwargs):
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self.scheduler = scheduler
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self.schedule = schedule
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self.callback = callback
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self.callback_args = callback_args
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self.callback_kwargs = callback_kwargs
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def start(self):
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if self._cancelled:
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log.debug("Reconnection handler was cancelled before starting")
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return
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first_delay = next(self.schedule)
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self.scheduler.schedule(first_delay, self.run)
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def run(self):
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if self._cancelled:
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return
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conn = None
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try:
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conn = self.try_reconnect()
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except Exception as exc:
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try:
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next_delay = next(self.schedule)
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except StopIteration:
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# the schedule has been exhausted
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next_delay = None
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# call on_exception for logging purposes even if next_delay is None
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if self.on_exception(exc, next_delay):
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if next_delay is None:
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log.warning(
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"Will not continue to retry reconnection attempts "
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"due to an exhausted retry schedule")
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else:
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self.scheduler.schedule(next_delay, self.run)
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else:
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if not self._cancelled:
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self.on_reconnection(conn)
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self.callback(*(self.callback_args), **(self.callback_kwargs))
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finally:
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if conn:
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conn.close()
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def cancel(self):
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self._cancelled = True
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def try_reconnect(self):
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"""
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Subclasses must implement this method. It should attempt to
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open a new Connection and return it; if a failure occurs, an
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Exception should be raised.
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"""
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raise NotImplementedError()
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def on_reconnection(self, connection):
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"""
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Called when a new Connection is successfully opened. Nothing is
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done by default.
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"""
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pass
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def on_exception(self, exc, next_delay):
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"""
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Called when an Exception is raised when trying to connect.
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`exc` is the Exception that was raised and `next_delay` is the
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number of seconds (as a float) that the handler will wait before
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attempting to connect again.
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Subclasses should return :const:`False` if no more attempts to
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connection should be made, :const:`True` otherwise. The default
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behavior is to always retry unless the error is an
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:exc:`.AuthenticationFailed` instance.
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"""
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if isinstance(exc, AuthenticationFailed):
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return False
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else:
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return True
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class _HostReconnectionHandler(_ReconnectionHandler):
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def __init__(self, host, connection_factory, is_host_addition, on_add, on_up, *args, **kwargs):
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_ReconnectionHandler.__init__(self, *args, **kwargs)
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self.is_host_addition = is_host_addition
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self.on_add = on_add
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self.on_up = on_up
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self.host = host
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self.connection_factory = connection_factory
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def try_reconnect(self):
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return self.connection_factory()
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def on_reconnection(self, connection):
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log.info("Successful reconnection to %s, marking node up if it isn't already", self.host)
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if self.is_host_addition:
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self.on_add(self.host)
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else:
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self.on_up(self.host)
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def on_exception(self, exc, next_delay):
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if isinstance(exc, AuthenticationFailed):
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return False
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else:
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log.warning("Error attempting to reconnect to %s, scheduling retry in %s seconds: %s",
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self.host, next_delay, exc)
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log.debug("Reconnection error details", exc_info=True)
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return True
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class HostConnection(object):
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"""
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When using v3 of the native protocol, this is used instead of a connection
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pool per host (HostConnectionPool) due to the increased in-flight capacity
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of individual connections.
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"""
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host = None
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host_distance = None
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is_shutdown = False
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_session = None
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_connection = None
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_lock = None
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def __init__(self, host, host_distance, session):
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self.host = host
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self.host_distance = host_distance
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self._session = weakref.proxy(session)
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self._lock = Lock()
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if host_distance == HostDistance.IGNORED:
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log.debug("Not opening connection to ignored host %s", self.host)
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return
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elif host_distance == HostDistance.REMOTE and not session.cluster.connect_to_remote_hosts:
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log.debug("Not opening connection to remote host %s", self.host)
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return
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log.debug("Initializing connection for host %s", self.host)
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self._connection = session.cluster.connection_factory(host.address)
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if session.keyspace:
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self._connection.set_keyspace_blocking(session.keyspace)
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log.debug("Finished initializing connection for host %s", self.host)
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def borrow_connection(self, timeout):
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if self.is_shutdown:
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raise ConnectionException(
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"Pool for %s is shutdown" % (self.host,), self.host)
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conn = self._connection
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if not conn:
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raise NoConnectionsAvailable()
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with conn.lock:
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if conn.in_flight < conn.max_request_id:
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conn.in_flight += 1
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return conn, conn.get_request_id()
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raise NoConnectionsAvailable("All request IDs are currently in use")
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def return_connection(self, connection):
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with connection.lock:
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connection.in_flight -= 1
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if (connection.is_defunct or connection.is_closed) and not connection.signaled_error:
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log.debug("Defunct or closed connection (%s) returned to pool, potentially "
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"marking host %s as down", id(connection), self.host)
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is_down = self._session.cluster.signal_connection_failure(
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self.host, connection.last_error, is_host_addition=False)
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connection.signaled_error = True
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if is_down:
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self.shutdown()
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else:
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self._connection = None
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with self._lock:
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if self._is_replacing:
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return
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self._is_replacing = True
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self._session.submit(self._replace, connection)
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def _replace(self, connection):
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log.debug("Replacing connection (%s) to %s", id(connection), self.host)
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conn = self._session.cluster.connection_factory(self.host.address)
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if self._session.keyspace:
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conn.set_keyspace_blocking(self._session.keyspace)
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self._connection = conn
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with self._lock:
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self._is_replacing = False
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def shutdown(self):
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with self._lock:
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if self.is_shutdown:
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return
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else:
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self.is_shutdown = True
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if self._connection:
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self._connection.close()
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def _set_keyspace_for_all_conns(self, keyspace, callback):
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if self.is_shutdown or not self._connection:
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return
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def connection_finished_setting_keyspace(conn, error):
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self.return_connection(conn)
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errors = [] if not error else [error]
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callback(self, errors)
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self._connection.set_keyspace_async(keyspace, connection_finished_setting_keyspace)
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def get_connections(self):
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c = self._connection
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return [c] if c else []
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def get_state(self):
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connection = self._connection
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open_count = 1 if connection and not (connection.is_closed or connection.is_defunct) else 0
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in_flights = [connection.in_flight] if connection else []
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return {'shutdown': self.is_shutdown, 'open_count': open_count, 'in_flights': in_flights}
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@property
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def open_count(self):
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connection = self._connection
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return 1 if connection and not (connection.is_closed or connection.is_defunct) else 0
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_MAX_SIMULTANEOUS_CREATION = 1
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_MIN_TRASH_INTERVAL = 10
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class HostConnectionPool(object):
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"""
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Used to pool connections to a host for v1 and v2 native protocol.
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"""
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host = None
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host_distance = None
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is_shutdown = False
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open_count = 0
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_scheduled_for_creation = 0
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_next_trash_allowed_at = 0
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def __init__(self, host, host_distance, session):
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self.host = host
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self.host_distance = host_distance
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self._session = weakref.proxy(session)
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self._lock = RLock()
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self._conn_available_condition = Condition()
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log.debug("Initializing new connection pool for host %s", self.host)
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core_conns = session.cluster.get_core_connections_per_host(host_distance)
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self._connections = [session.cluster.connection_factory(host.address)
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for i in range(core_conns)]
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if session.keyspace:
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for conn in self._connections:
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conn.set_keyspace_blocking(session.keyspace)
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self._trash = set()
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self._next_trash_allowed_at = time.time()
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self.open_count = core_conns
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log.debug("Finished initializing new connection pool for host %s", self.host)
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def borrow_connection(self, timeout):
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if self.is_shutdown:
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raise ConnectionException(
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"Pool for %s is shutdown" % (self.host,), self.host)
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conns = self._connections
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if not conns:
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# handled specially just for simpler code
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log.debug("Detected empty pool, opening core conns to %s", self.host)
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core_conns = self._session.cluster.get_core_connections_per_host(self.host_distance)
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with self._lock:
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# we check the length of self._connections again
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# along with self._scheduled_for_creation while holding the lock
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# in case multiple threads hit this condition at the same time
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to_create = core_conns - (len(self._connections) + self._scheduled_for_creation)
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for i in range(to_create):
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self._scheduled_for_creation += 1
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self._session.submit(self._create_new_connection)
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# in_flight is incremented by wait_for_conn
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conn = self._wait_for_conn(timeout)
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return conn
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else:
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# note: it would be nice to push changes to these config settings
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# to pools instead of doing a new lookup on every
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# borrow_connection() call
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max_reqs = self._session.cluster.get_max_requests_per_connection(self.host_distance)
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max_conns = self._session.cluster.get_max_connections_per_host(self.host_distance)
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least_busy = min(conns, key=lambda c: c.in_flight)
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request_id = None
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# to avoid another thread closing this connection while
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# trashing it (through the return_connection process), hold
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# the connection lock from this point until we've incremented
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# its in_flight count
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need_to_wait = False
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with least_busy.lock:
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if least_busy.in_flight < least_busy.max_request_id:
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least_busy.in_flight += 1
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request_id = least_busy.get_request_id()
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else:
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# once we release the lock, wait for another connection
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need_to_wait = True
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if need_to_wait:
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# wait_for_conn will increment in_flight on the conn
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least_busy, request_id = self._wait_for_conn(timeout)
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# if we have too many requests on this connection but we still
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# have space to open a new connection against this host, go ahead
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# and schedule the creation of a new connection
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if least_busy.in_flight >= max_reqs and len(self._connections) < max_conns:
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self._maybe_spawn_new_connection()
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return least_busy, request_id
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def _maybe_spawn_new_connection(self):
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with self._lock:
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if self._scheduled_for_creation >= _MAX_SIMULTANEOUS_CREATION:
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return
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if self.open_count >= self._session.cluster.get_max_connections_per_host(self.host_distance):
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return
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self._scheduled_for_creation += 1
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log.debug("Submitting task for creation of new Connection to %s", self.host)
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self._session.submit(self._create_new_connection)
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def _create_new_connection(self):
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try:
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self._add_conn_if_under_max()
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except (ConnectionException, socket.error) as exc:
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log.warning("Failed to create new connection to %s: %s", self.host, exc)
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except Exception:
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log.exception("Unexpectedly failed to create new connection")
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finally:
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with self._lock:
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self._scheduled_for_creation -= 1
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def _add_conn_if_under_max(self):
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max_conns = self._session.cluster.get_max_connections_per_host(self.host_distance)
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with self._lock:
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if self.is_shutdown:
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return False
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if self.open_count >= max_conns:
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return False
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self.open_count += 1
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log.debug("Going to open new connection to host %s", self.host)
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try:
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conn = self._session.cluster.connection_factory(self.host.address)
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if self._session.keyspace:
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conn.set_keyspace_blocking(self._session.keyspace)
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self._next_trash_allowed_at = time.time() + _MIN_TRASH_INTERVAL
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with self._lock:
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new_connections = self._connections[:] + [conn]
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self._connections = new_connections
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log.debug("Added new connection (%s) to pool for host %s, signaling availablility",
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id(conn), self.host)
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self._signal_available_conn()
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return True
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except (ConnectionException, socket.error) as exc:
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log.warning("Failed to add new connection to pool for host %s: %s", self.host, exc)
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with self._lock:
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self.open_count -= 1
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if self._session.cluster.signal_connection_failure(self.host, exc, is_host_addition=False):
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self.shutdown()
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return False
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except AuthenticationFailed:
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with self._lock:
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self.open_count -= 1
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return False
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def _await_available_conn(self, timeout):
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with self._conn_available_condition:
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self._conn_available_condition.wait(timeout)
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|
|
|
def _signal_available_conn(self):
|
|
with self._conn_available_condition:
|
|
self._conn_available_condition.notify()
|
|
|
|
def _signal_all_available_conn(self):
|
|
with self._conn_available_condition:
|
|
self._conn_available_condition.notify_all()
|
|
|
|
def _wait_for_conn(self, timeout):
|
|
start = time.time()
|
|
remaining = timeout
|
|
|
|
while remaining > 0:
|
|
# wait on our condition for the possibility that a connection
|
|
# is useable
|
|
self._await_available_conn(remaining)
|
|
|
|
# self.shutdown() may trigger the above Condition
|
|
if self.is_shutdown:
|
|
raise ConnectionException("Pool is shutdown")
|
|
|
|
conns = self._connections
|
|
if conns:
|
|
least_busy = min(conns, key=lambda c: c.in_flight)
|
|
with least_busy.lock:
|
|
if least_busy.in_flight < least_busy.max_request_id:
|
|
least_busy.in_flight += 1
|
|
return least_busy, least_busy.get_request_id()
|
|
|
|
remaining = timeout - (time.time() - start)
|
|
|
|
raise NoConnectionsAvailable()
|
|
|
|
def return_connection(self, connection):
|
|
with connection.lock:
|
|
connection.in_flight -= 1
|
|
in_flight = connection.in_flight
|
|
|
|
if connection.is_defunct or connection.is_closed:
|
|
if not connection.signaled_error:
|
|
log.debug("Defunct or closed connection (%s) returned to pool, potentially "
|
|
"marking host %s as down", id(connection), self.host)
|
|
is_down = self._session.cluster.signal_connection_failure(
|
|
self.host, connection.last_error, is_host_addition=False)
|
|
connection.signaled_error = True
|
|
if is_down:
|
|
self.shutdown()
|
|
else:
|
|
self._replace(connection)
|
|
else:
|
|
if connection in self._trash:
|
|
with connection.lock:
|
|
if connection.in_flight == 0:
|
|
with self._lock:
|
|
if connection in self._trash:
|
|
self._trash.remove(connection)
|
|
log.debug("Closing trashed connection (%s) to %s", id(connection), self.host)
|
|
connection.close()
|
|
return
|
|
|
|
core_conns = self._session.cluster.get_core_connections_per_host(self.host_distance)
|
|
min_reqs = self._session.cluster.get_min_requests_per_connection(self.host_distance)
|
|
# we can use in_flight here without holding the connection lock
|
|
# because the fact that in_flight dipped below the min at some
|
|
# point is enough to start the trashing procedure
|
|
if len(self._connections) > core_conns and in_flight <= min_reqs and \
|
|
time.time() >= self._next_trash_allowed_at:
|
|
self._maybe_trash_connection(connection)
|
|
else:
|
|
self._signal_available_conn()
|
|
|
|
def _maybe_trash_connection(self, connection):
|
|
core_conns = self._session.cluster.get_core_connections_per_host(self.host_distance)
|
|
did_trash = False
|
|
with self._lock:
|
|
if connection not in self._connections:
|
|
return
|
|
|
|
if self.open_count > core_conns:
|
|
did_trash = True
|
|
self.open_count -= 1
|
|
new_connections = self._connections[:]
|
|
new_connections.remove(connection)
|
|
self._connections = new_connections
|
|
|
|
with connection.lock:
|
|
if connection.in_flight == 0:
|
|
log.debug("Skipping trash and closing unused connection (%s) to %s", id(connection), self.host)
|
|
connection.close()
|
|
|
|
# skip adding it to the trash if we're already closing it
|
|
return
|
|
|
|
self._trash.add(connection)
|
|
|
|
if did_trash:
|
|
self._next_trash_allowed_at = time.time() + _MIN_TRASH_INTERVAL
|
|
log.debug("Trashed connection (%s) to %s", id(connection), self.host)
|
|
|
|
def _replace(self, connection):
|
|
should_replace = False
|
|
with self._lock:
|
|
if connection in self._connections:
|
|
new_connections = self._connections[:]
|
|
new_connections.remove(connection)
|
|
self._connections = new_connections
|
|
self.open_count -= 1
|
|
should_replace = True
|
|
|
|
if should_replace:
|
|
log.debug("Replacing connection (%s) to %s", id(connection), self.host)
|
|
|
|
def close_and_replace():
|
|
connection.close()
|
|
self._add_conn_if_under_max()
|
|
|
|
self._session.submit(close_and_replace)
|
|
else:
|
|
# just close it
|
|
log.debug("Closing connection (%s) to %s", id(connection), self.host)
|
|
connection.close()
|
|
|
|
def shutdown(self):
|
|
with self._lock:
|
|
if self.is_shutdown:
|
|
return
|
|
else:
|
|
self.is_shutdown = True
|
|
|
|
self._signal_all_available_conn()
|
|
for conn in self._connections:
|
|
conn.close()
|
|
self.open_count -= 1
|
|
|
|
for conn in self._trash:
|
|
conn.close()
|
|
|
|
def ensure_core_connections(self):
|
|
if self.is_shutdown:
|
|
return
|
|
|
|
core_conns = self._session.cluster.get_core_connections_per_host(self.host_distance)
|
|
with self._lock:
|
|
to_create = core_conns - (len(self._connections) + self._scheduled_for_creation)
|
|
for i in range(to_create):
|
|
self._scheduled_for_creation += 1
|
|
self._session.submit(self._create_new_connection)
|
|
|
|
def _set_keyspace_for_all_conns(self, keyspace, callback):
|
|
"""
|
|
Asynchronously sets the keyspace for all connections. When all
|
|
connections have been set, `callback` will be called with two
|
|
arguments: this pool, and a list of any errors that occurred.
|
|
"""
|
|
remaining_callbacks = set(self._connections)
|
|
errors = []
|
|
|
|
if not remaining_callbacks:
|
|
callback(self, errors)
|
|
return
|
|
|
|
def connection_finished_setting_keyspace(conn, error):
|
|
self.return_connection(conn)
|
|
remaining_callbacks.remove(conn)
|
|
if error:
|
|
errors.append(error)
|
|
|
|
if not remaining_callbacks:
|
|
callback(self, errors)
|
|
|
|
for conn in self._connections:
|
|
conn.set_keyspace_async(keyspace, connection_finished_setting_keyspace)
|
|
|
|
def get_connections(self):
|
|
return self._connections
|
|
|
|
def get_state(self):
|
|
in_flights = [c.in_flight for c in self._connections]
|
|
return {'shutdown': self.is_shutdown, 'open_count': self.open_count, 'in_flights': in_flights}
|