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# Copyright 2013-2015 DataStax, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from cProfile import Profile
import logging
import os.path
import sys
from threading import Thread
import time
from optparse import OptionParser
from greplin import scales
dirname = os.path.dirname(os.path.abspath(__file__))
sys.path.append(dirname)
sys.path.append(os.path.join(dirname, '..'))
import cassandra
from cassandra.cluster import Cluster
from cassandra.io.asyncorereactor import AsyncoreConnection
from cassandra.policies import HostDistance
log = logging.getLogger()
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter("%(asctime)s [%(levelname)s] %(name)s: %(message)s"))
log.addHandler(handler)
logging.getLogger('cassandra').setLevel(logging.WARN)
have_libev = False
supported_reactors = [AsyncoreConnection]
try:
from cassandra.io.libevreactor import LibevConnection
have_libev = True
supported_reactors.append(LibevConnection)
except ImportError as exc:
pass
have_twisted = False
try:
from cassandra.io.twistedreactor import TwistedConnection
have_twisted = True
supported_reactors.append(TwistedConnection)
except ImportError as exc:
log.exception("Error importing twisted")
pass
KEYSPACE = "testkeyspace" + str(int(time.time()))
TABLE = "testtable"
def setup(hosts):
log.info("Using 'cassandra' package from %s", cassandra.__path__)
cluster = Cluster(hosts, protocol_version=1)
cluster.set_core_connections_per_host(HostDistance.LOCAL, 1)
try:
session = cluster.connect()
log.debug("Creating keyspace...")
session.execute("""
CREATE KEYSPACE %s
WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '2' }
""" % KEYSPACE)
log.debug("Setting keyspace...")
session.set_keyspace(KEYSPACE)
log.debug("Creating table...")
session.execute("""
CREATE TABLE %s (
thekey text,
col1 text,
col2 text,
PRIMARY KEY (thekey, col1)
)
""" % TABLE)
finally:
cluster.shutdown()
def teardown(hosts):
cluster = Cluster(hosts, protocol_version=1)
cluster.set_core_connections_per_host(HostDistance.LOCAL, 1)
session = cluster.connect()
session.execute("DROP KEYSPACE " + KEYSPACE)
cluster.shutdown()
def benchmark(thread_class):
options, args = parse_options()
for conn_class in options.supported_reactors:
setup(options.hosts)
log.info("==== %s ====" % (conn_class.__name__,))
kwargs = {'metrics_enabled': options.enable_metrics,
'connection_class': conn_class}
if options.protocol_version:
kwargs['protocol_version'] = options.protocol_version
cluster = Cluster(options.hosts, **kwargs)
session = cluster.connect(KEYSPACE)
log.debug("Sleeping for two seconds...")
time.sleep(2.0)
query = session.prepare("""
INSERT INTO {table} (thekey, col1, col2) VALUES (?, ?, ?)
""".format(table=TABLE))
values = ('key', 'a', 'b')
per_thread = options.num_ops // options.threads
threads = []
log.debug("Beginning inserts...")
start = time.time()
try:
for i in range(options.threads):
thread = thread_class(
i, session, query, values, per_thread,
cluster.protocol_version, options.profile)
thread.daemon = True
threads.append(thread)
for thread in threads:
thread.start()
for thread in threads:
while thread.is_alive():
thread.join(timeout=0.5)
end = time.time()
finally:
cluster.shutdown()
teardown(options.hosts)
total = end - start
log.info("Total time: %0.2fs" % total)
log.info("Average throughput: %0.2f/sec" % (options.num_ops / total))
if options.enable_metrics:
stats = scales.getStats()['cassandra']
log.info("Connection errors: %d", stats['connection_errors'])
log.info("Write timeouts: %d", stats['write_timeouts'])
log.info("Read timeouts: %d", stats['read_timeouts'])
log.info("Unavailables: %d", stats['unavailables'])
log.info("Other errors: %d", stats['other_errors'])
log.info("Retries: %d", stats['retries'])
request_timer = stats['request_timer']
log.info("Request latencies:")
log.info(" min: %0.4fs", request_timer['min'])
log.info(" max: %0.4fs", request_timer['max'])
log.info(" mean: %0.4fs", request_timer['mean'])
log.info(" stddev: %0.4fs", request_timer['stddev'])
log.info(" median: %0.4fs", request_timer['median'])
log.info(" 75th: %0.4fs", request_timer['75percentile'])
log.info(" 95th: %0.4fs", request_timer['95percentile'])
log.info(" 98th: %0.4fs", request_timer['98percentile'])
log.info(" 99th: %0.4fs", request_timer['99percentile'])
log.info(" 99.9th: %0.4fs", request_timer['999percentile'])
def parse_options():
parser = OptionParser()
parser.add_option('-H', '--hosts', default='127.0.0.1',
help='cassandra hosts to connect to (comma-separated list) [default: %default]')
parser.add_option('-t', '--threads', type='int', default=1,
help='number of threads [default: %default]')
parser.add_option('-n', '--num-ops', type='int', default=10000,
help='number of operations [default: %default]')
parser.add_option('--asyncore-only', action='store_true', dest='asyncore_only',
help='only benchmark with asyncore connections')
parser.add_option('--libev-only', action='store_true', dest='libev_only',
help='only benchmark with libev connections')
parser.add_option('--twisted-only', action='store_true', dest='twisted_only',
help='only benchmark with Twisted connections')
parser.add_option('-m', '--metrics', action='store_true', dest='enable_metrics',
help='enable and print metrics for operations')
parser.add_option('-l', '--log-level', default='info',
help='logging level: debug, info, warning, or error')
parser.add_option('-p', '--profile', action='store_true', dest='profile',
help='Profile the run')
parser.add_option('--protocol-version', type='int', dest='protocol_version',
help='Native protocol version to use')
options, args = parser.parse_args()
options.hosts = options.hosts.split(',')
log.setLevel(options.log_level.upper())
if options.asyncore_only:
options.supported_reactors = [AsyncoreConnection]
elif options.libev_only:
if not have_libev:
log.error("libev is not available")
sys.exit(1)
options.supported_reactors = [LibevConnection]
elif options.twisted_only:
if not have_twisted:
log.error("Twisted is not available")
sys.exit(1)
options.supported_reactors = [TwistedConnection]
else:
options.supported_reactors = supported_reactors
if not have_libev:
log.warning("Not benchmarking libev reactor because libev is not available")
return options, args
class BenchmarkThread(Thread):
def __init__(self, thread_num, session, query, values, num_queries, protocol_version, profile):
Thread.__init__(self)
self.thread_num = thread_num
self.session = session
self.query = query
self.values = values
self.num_queries = num_queries
self.protocol_version = protocol_version
self.profiler = Profile() if profile else None
def start_profile(self):
if self.profiler:
self.profiler.enable()
def finish_profile(self):
if self.profiler:
self.profiler.disable()
self.profiler.dump_stats('profile-%d' % self.thread_num)
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