Pool memcache connections
This creates a pool to each memcache server so that connections will not grow without bound. This also adds a proxy config "max_memcache_connections" which can control how many connections are available in the pool. A side effect of the change is that we had to change the memcache calls that used noreply, and instead wait for the result of the request. Leaving with noreply could cause a race condition (specifically in account auto create), due to one request calling `memcache.del(key)` and then `memcache.get(key)` with a different pooled connection. If the delete didn't complete fast enough, the get would return the old value before it was deleted, and thus believe that the account was not autocreated. ClaysMindExploded DocImpact Change-Id: I350720b7bba29e1453894d3d4105ac1ea232595b
This commit is contained in:
Chuck Thier
parent
58efcb3b3e
commit
ae8470131e
@ -795,6 +795,9 @@ client_chunk_size 65536 Chunk size to read from
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clients
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memcache_servers 127.0.0.1:11211 Comma separated list of
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memcached servers ip:port
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memcache_max_connections 2 Max number of connections to
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each memcached server per
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worker
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node_timeout 10 Request timeout to external
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services
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client_timeout 60 Timeout to read one chunk
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@ -46,12 +46,15 @@ http://github.com/memcached/memcached/blob/1.4.2/doc/protocol.txt
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import cPickle as pickle
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import logging
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import socket
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import time
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from bisect import bisect
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from swift import gettext_ as _
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from hashlib import md5
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from eventlet.green import socket
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from eventlet.pools import Pool
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from eventlet import Timeout
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from swift.common.utils import json
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DEFAULT_MEMCACHED_PORT = 11211
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@ -91,6 +94,34 @@ class MemcacheConnectionError(Exception):
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pass
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class MemcacheConnPool(Pool):
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"""Connection pool for Memcache Connections"""
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def __init__(self, server, size, connect_timeout):
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Pool.__init__(self, max_size=size)
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self.server = server
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self._connect_timeout = connect_timeout
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def create(self):
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if ':' in self.server:
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host, port = self.server.split(':')
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else:
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host = self.server
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port = DEFAULT_MEMCACHED_PORT
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
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with Timeout(self._connect_timeout):
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sock.connect((host, int(port)))
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return (sock.makefile(), sock)
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def get(self):
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fp, sock = Pool.get(self)
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if fp is None:
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# An error happened previously, so we need a new connection
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fp, sock = self.create()
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return fp, sock
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class MemcacheRing(object):
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"""
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Simple, consistent-hashed memcache client.
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@ -98,7 +129,8 @@ class MemcacheRing(object):
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def __init__(self, servers, connect_timeout=CONN_TIMEOUT,
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io_timeout=IO_TIMEOUT, tries=TRY_COUNT,
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allow_pickle=False, allow_unpickle=False):
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allow_pickle=False, allow_unpickle=False,
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max_conns=2):
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self._ring = {}
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self._errors = dict(((serv, []) for serv in servers))
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self._error_limited = dict(((serv, 0) for serv in servers))
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@ -107,7 +139,10 @@ class MemcacheRing(object):
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self._ring[md5hash('%s-%s' % (server, i))] = server
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self._tries = tries if tries <= len(servers) else len(servers)
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self._sorted = sorted(self._ring)
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self._client_cache = dict(((server, []) for server in servers))
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self._client_cache = dict(((server,
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MemcacheConnPool(server, max_conns,
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connect_timeout))
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for server in servers))
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self._connect_timeout = connect_timeout
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self._io_timeout = io_timeout
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self._allow_pickle = allow_pickle
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@ -115,7 +150,7 @@ class MemcacheRing(object):
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def _exception_occurred(self, server, e, action='talking',
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sock=None, fp=None):
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if isinstance(e, socket.timeout):
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if isinstance(e, Timeout):
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logging.error(_("Timeout %(action)s to memcached: %(server)s"),
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{'action': action, 'server': server})
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else:
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@ -133,6 +168,9 @@ class MemcacheRing(object):
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del sock
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except Exception:
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pass
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# We need to return something to the pool
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# A new connection will be created the next time it is retreived
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self._return_conn(server, None, None)
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now = time.time()
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self._errors[server].append(time.time())
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if len(self._errors[server]) > ERROR_LIMIT_COUNT:
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@ -159,28 +197,16 @@ class MemcacheRing(object):
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continue
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sock = None
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try:
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fp, sock = self._client_cache[server].pop()
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with Timeout(self._connect_timeout):
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fp, sock = self._client_cache[server].get()
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yield server, fp, sock
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except IndexError:
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try:
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if ':' in server:
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host, port = server.split(':')
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else:
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host = server
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port = DEFAULT_MEMCACHED_PORT
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
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sock.settimeout(self._connect_timeout)
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sock.connect((host, int(port)))
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sock.settimeout(self._io_timeout)
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yield server, sock.makefile(), sock
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except Exception as e:
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self._exception_occurred(
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server, e, action='connecting', sock=sock)
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except (Exception, Timeout) as e:
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self._exception_occurred(
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server, e, action='connecting', sock=sock)
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def _return_conn(self, server, fp, sock):
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"""Returns a server connection to the pool."""
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self._client_cache[server].append((fp, sock))
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self._client_cache[server].put((fp, sock))
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def set(self, key, value, serialize=True, timeout=0, time=0,
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min_compress_len=0):
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@ -217,11 +243,14 @@ class MemcacheRing(object):
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flags |= JSON_FLAG
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for (server, fp, sock) in self._get_conns(key):
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try:
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sock.sendall('set %s %d %d %s noreply\r\n%s\r\n' %
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(key, flags, timeout, len(value), value))
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self._return_conn(server, fp, sock)
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return
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except Exception as e:
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with Timeout(self._io_timeout):
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sock.sendall('set %s %d %d %s\r\n%s\r\n' %
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(key, flags, timeout, len(value), value))
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# Wait for the set to complete
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fp.readline()
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self._return_conn(server, fp, sock)
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return
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except (Exception, Timeout) as e:
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self._exception_occurred(server, e, sock=sock, fp=fp)
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def get(self, key):
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@ -237,24 +266,25 @@ class MemcacheRing(object):
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value = None
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for (server, fp, sock) in self._get_conns(key):
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try:
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sock.sendall('get %s\r\n' % key)
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line = fp.readline().strip().split()
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while line[0].upper() != 'END':
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if line[0].upper() == 'VALUE' and line[1] == key:
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size = int(line[3])
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value = fp.read(size)
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if int(line[2]) & PICKLE_FLAG:
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if self._allow_unpickle:
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value = pickle.loads(value)
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else:
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value = None
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elif int(line[2]) & JSON_FLAG:
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value = json.loads(value)
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fp.readline()
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with Timeout(self._io_timeout):
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sock.sendall('get %s\r\n' % key)
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line = fp.readline().strip().split()
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self._return_conn(server, fp, sock)
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return value
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except Exception as e:
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while line[0].upper() != 'END':
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if line[0].upper() == 'VALUE' and line[1] == key:
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size = int(line[3])
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value = fp.read(size)
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if int(line[2]) & PICKLE_FLAG:
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if self._allow_unpickle:
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value = pickle.loads(value)
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else:
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value = None
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elif int(line[2]) & JSON_FLAG:
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value = json.loads(value)
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fp.readline()
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line = fp.readline().strip().split()
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self._return_conn(server, fp, sock)
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return value
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except (Exception, Timeout) as e:
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self._exception_occurred(server, e, sock=sock, fp=fp)
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def incr(self, key, delta=1, time=0, timeout=0):
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@ -287,26 +317,28 @@ class MemcacheRing(object):
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timeout = sanitize_timeout(time or timeout)
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for (server, fp, sock) in self._get_conns(key):
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try:
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sock.sendall('%s %s %s\r\n' % (command, key, delta))
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line = fp.readline().strip().split()
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if line[0].upper() == 'NOT_FOUND':
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add_val = delta
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if command == 'decr':
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add_val = '0'
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sock.sendall('add %s %d %d %s\r\n%s\r\n' %
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(key, 0, timeout, len(add_val), add_val))
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with Timeout(self._io_timeout):
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sock.sendall('%s %s %s\r\n' % (command, key, delta))
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line = fp.readline().strip().split()
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if line[0].upper() == 'NOT_STORED':
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sock.sendall('%s %s %s\r\n' % (command, key, delta))
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if line[0].upper() == 'NOT_FOUND':
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add_val = delta
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if command == 'decr':
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add_val = '0'
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sock.sendall('add %s %d %d %s\r\n%s\r\n' %
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(key, 0, timeout, len(add_val), add_val))
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line = fp.readline().strip().split()
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ret = int(line[0].strip())
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if line[0].upper() == 'NOT_STORED':
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sock.sendall('%s %s %s\r\n' % (command, key,
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delta))
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line = fp.readline().strip().split()
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ret = int(line[0].strip())
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else:
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ret = int(add_val)
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else:
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ret = int(add_val)
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else:
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ret = int(line[0].strip())
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self._return_conn(server, fp, sock)
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return ret
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except Exception as e:
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ret = int(line[0].strip())
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self._return_conn(server, fp, sock)
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return ret
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except (Exception, Timeout) as e:
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self._exception_occurred(server, e, sock=sock, fp=fp)
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raise MemcacheConnectionError("No Memcached connections succeeded.")
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@ -340,10 +372,13 @@ class MemcacheRing(object):
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key = md5hash(key)
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for (server, fp, sock) in self._get_conns(key):
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try:
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sock.sendall('delete %s noreply\r\n' % key)
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self._return_conn(server, fp, sock)
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return
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except Exception as e:
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with Timeout(self._io_timeout):
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sock.sendall('delete %s\r\n' % key)
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# Wait for the delete to complete
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fp.readline()
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self._return_conn(server, fp, sock)
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return
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except (Exception, Timeout) as e:
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self._exception_occurred(server, e, sock=sock, fp=fp)
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def set_multi(self, mapping, server_key, serialize=True, timeout=0,
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@ -384,14 +419,18 @@ class MemcacheRing(object):
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elif serialize:
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value = json.dumps(value)
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flags |= JSON_FLAG
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msg += ('set %s %d %d %s noreply\r\n%s\r\n' %
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msg += ('set %s %d %d %s\r\n%s\r\n' %
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(key, flags, timeout, len(value), value))
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for (server, fp, sock) in self._get_conns(server_key):
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try:
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sock.sendall(msg)
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self._return_conn(server, fp, sock)
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return
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except Exception as e:
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with Timeout(self._io_timeout):
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sock.sendall(msg)
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# Wait for the set to complete
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for _ in range(len(mapping)):
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fp.readline()
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self._return_conn(server, fp, sock)
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return
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except (Exception, Timeout) as e:
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self._exception_occurred(server, e, sock=sock, fp=fp)
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def get_multi(self, keys, server_key):
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@ -407,30 +446,31 @@ class MemcacheRing(object):
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keys = [md5hash(key) for key in keys]
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for (server, fp, sock) in self._get_conns(server_key):
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try:
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sock.sendall('get %s\r\n' % ' '.join(keys))
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line = fp.readline().strip().split()
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responses = {}
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while line[0].upper() != 'END':
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if line[0].upper() == 'VALUE':
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size = int(line[3])
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value = fp.read(size)
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if int(line[2]) & PICKLE_FLAG:
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if self._allow_unpickle:
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value = pickle.loads(value)
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else:
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value = None
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elif int(line[2]) & JSON_FLAG:
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value = json.loads(value)
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responses[line[1]] = value
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fp.readline()
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with Timeout(self._io_timeout):
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sock.sendall('get %s\r\n' % ' '.join(keys))
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line = fp.readline().strip().split()
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values = []
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for key in keys:
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if key in responses:
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values.append(responses[key])
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else:
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values.append(None)
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self._return_conn(server, fp, sock)
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return values
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except Exception as e:
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responses = {}
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while line[0].upper() != 'END':
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if line[0].upper() == 'VALUE':
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size = int(line[3])
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value = fp.read(size)
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if int(line[2]) & PICKLE_FLAG:
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if self._allow_unpickle:
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value = pickle.loads(value)
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else:
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value = None
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elif int(line[2]) & JSON_FLAG:
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value = json.loads(value)
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responses[line[1]] = value
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fp.readline()
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line = fp.readline().strip().split()
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values = []
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for key in keys:
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if key in responses:
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values.append(responses[key])
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else:
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values.append(None)
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self._return_conn(server, fp, sock)
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return values
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except (Exception, Timeout) as e:
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self._exception_occurred(server, e, sock=sock, fp=fp)
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@ -28,6 +28,7 @@ class MemcacheMiddleware(object):
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self.app = app
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self.memcache_servers = conf.get('memcache_servers')
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serialization_format = conf.get('memcache_serialization_support')
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max_conns = int(conf.get('max_connections', 2))
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if not self.memcache_servers or serialization_format is None:
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path = os.path.join(conf.get('swift_dir', '/etc/swift'),
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@ -58,7 +59,8 @@ class MemcacheMiddleware(object):
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self.memcache = MemcacheRing(
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[s.strip() for s in self.memcache_servers.split(',') if s.strip()],
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allow_pickle=(serialization_format == 0),
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allow_unpickle=(serialization_format <= 1))
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allow_unpickle=(serialization_format <= 1),
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max_conns=max_conns)
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def __call__(self, env, start_response):
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env['swift.cache'] = self.memcache
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@ -23,10 +23,23 @@ import time
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import unittest
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from uuid import uuid4
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from eventlet import GreenPool, sleep, Queue
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from eventlet.pools import Pool
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from swift.common import memcached
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from mock import patch
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from test.unit import NullLoggingHandler
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class MockedMemcachePool(memcached.MemcacheConnPool):
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def __init__(self, mocks):
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Pool.__init__(self, max_size=2)
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self.mocks = mocks
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def create(self):
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return self.mocks.pop(0)
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class ExplodingMockMemcached(object):
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exploded = False
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@ -173,7 +186,8 @@ class TestMemcached(unittest.TestCase):
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def test_set_get(self):
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memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'])
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mock = MockMemcached()
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memcache_client._client_cache['1.2.3.4:11211'] = [(mock, mock)] * 2
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memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
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[(mock, mock)] * 2)
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memcache_client.set('some_key', [1, 2, 3])
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self.assertEquals(memcache_client.get('some_key'), [1, 2, 3])
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self.assertEquals(mock.cache.values()[0][1], '0')
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@ -200,7 +214,8 @@ class TestMemcached(unittest.TestCase):
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def test_incr(self):
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memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'])
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mock = MockMemcached()
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memcache_client._client_cache['1.2.3.4:11211'] = [(mock, mock)] * 2
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memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
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[(mock, mock)] * 2)
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memcache_client.incr('some_key', delta=5)
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self.assertEquals(memcache_client.get('some_key'), '5')
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memcache_client.incr('some_key', delta=5)
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@ -219,7 +234,8 @@ class TestMemcached(unittest.TestCase):
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def test_incr_w_timeout(self):
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memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'])
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mock = MockMemcached()
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memcache_client._client_cache['1.2.3.4:11211'] = [(mock, mock)] * 2
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memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
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[(mock, mock)] * 2)
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memcache_client.incr('some_key', delta=5, time=55)
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self.assertEquals(memcache_client.get('some_key'), '5')
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self.assertEquals(mock.cache.values()[0][1], '55')
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@ -242,7 +258,8 @@ class TestMemcached(unittest.TestCase):
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def test_decr(self):
|
||||
memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'])
|
||||
mock = MockMemcached()
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = [(mock, mock)] * 2
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
|
||||
[(mock, mock)] * 2)
|
||||
memcache_client.decr('some_key', delta=5)
|
||||
self.assertEquals(memcache_client.get('some_key'), '0')
|
||||
memcache_client.incr('some_key', delta=15)
|
||||
@ -261,8 +278,10 @@ class TestMemcached(unittest.TestCase):
|
||||
['1.2.3.4:11211', '1.2.3.5:11211'])
|
||||
mock1 = ExplodingMockMemcached()
|
||||
mock2 = MockMemcached()
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = [(mock2, mock2)]
|
||||
memcache_client._client_cache['1.2.3.5:11211'] = [(mock1, mock1)]
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
|
||||
[(mock2, mock2)])
|
||||
memcache_client._client_cache['1.2.3.5:11211'] = MockedMemcachePool(
|
||||
[(mock1, mock1)])
|
||||
memcache_client.set('some_key', [1, 2, 3])
|
||||
self.assertEquals(memcache_client.get('some_key'), [1, 2, 3])
|
||||
self.assertEquals(mock1.exploded, True)
|
||||
@ -270,7 +289,8 @@ class TestMemcached(unittest.TestCase):
|
||||
def test_delete(self):
|
||||
memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'])
|
||||
mock = MockMemcached()
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = [(mock, mock)] * 2
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
|
||||
[(mock, mock)] * 2)
|
||||
memcache_client.set('some_key', [1, 2, 3])
|
||||
self.assertEquals(memcache_client.get('some_key'), [1, 2, 3])
|
||||
memcache_client.delete('some_key')
|
||||
@ -279,7 +299,8 @@ class TestMemcached(unittest.TestCase):
|
||||
def test_multi(self):
|
||||
memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'])
|
||||
mock = MockMemcached()
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = [(mock, mock)] * 2
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
|
||||
[(mock, mock)] * 2)
|
||||
memcache_client.set_multi(
|
||||
{'some_key1': [1, 2, 3], 'some_key2': [4, 5, 6]}, 'multi_key')
|
||||
self.assertEquals(
|
||||
@ -313,7 +334,8 @@ class TestMemcached(unittest.TestCase):
|
||||
memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'],
|
||||
allow_pickle=True)
|
||||
mock = MockMemcached()
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = [(mock, mock)] * 2
|
||||
memcache_client._client_cache['1.2.3.4:11211'] = MockedMemcachePool(
|
||||
[(mock, mock)] * 2)
|
||||
memcache_client.set('some_key', [1, 2, 3])
|
||||
self.assertEquals(memcache_client.get('some_key'), [1, 2, 3])
|
||||
memcache_client._allow_pickle = False
|
||||
@ -328,6 +350,46 @@ class TestMemcached(unittest.TestCase):
|
||||
memcache_client._allow_pickle = True
|
||||
self.assertEquals(memcache_client.get('some_key'), [1, 2, 3])
|
||||
|
||||
def test_connection_pooling(self):
|
||||
with patch('swift.common.memcached.socket') as mock_module:
|
||||
# patch socket, stub socket.socket, mock sock
|
||||
mock_sock = mock_module.socket.return_value
|
||||
|
||||
# track clients waiting for connections
|
||||
connected = []
|
||||
connections = Queue()
|
||||
|
||||
def wait_connect(addr):
|
||||
connected.append(addr)
|
||||
connections.get()
|
||||
mock_sock.connect = wait_connect
|
||||
|
||||
memcache_client = memcached.MemcacheRing(['1.2.3.4:11211'],
|
||||
connect_timeout=10)
|
||||
# sanity
|
||||
self.assertEquals(1, len(memcache_client._client_cache))
|
||||
for server, pool in memcache_client._client_cache.items():
|
||||
self.assertEquals(2, pool.max_size)
|
||||
|
||||
# make 10 requests "at the same time"
|
||||
p = GreenPool()
|
||||
for i in range(10):
|
||||
p.spawn(memcache_client.set, 'key', 'value')
|
||||
for i in range(3):
|
||||
sleep(0.1)
|
||||
self.assertEquals(2, len(connected))
|
||||
# give out a connection
|
||||
connections.put(None)
|
||||
for i in range(3):
|
||||
sleep(0.1)
|
||||
self.assertEquals(2, len(connected))
|
||||
# finish up
|
||||
for i in range(8):
|
||||
connections.put(None)
|
||||
self.assertEquals(2, len(connected))
|
||||
p.waitall()
|
||||
self.assertEquals(2, len(connected))
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
unittest.main()
|
||||
|
||||
Loading…
Reference in New Issue
Block a user