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Concurrent view updates and VDU processing
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#!/usr/bin/env python | |
# Examples: | |
# ./script.py -x 20 -n 100 -w 5 -p 10 -q | |
# ./script.py -x 100 -n 2 -p 20 -w 1 -t 10 | |
# ./script.py -x 101 -n 2 -p 10 -w 5 -t 2 | |
import copy | |
import sys | |
import time | |
import threading | |
import os | |
import argparse | |
import uuid | |
import traceback | |
import random | |
from multiprocessing.dummy import Pool as ThreadPool | |
from multiprocessing import Pool | |
import couchdb | |
DB_URLS = [ | |
'http://adm:pass@localhost:15984', | |
# 'http://adm:pass@localhost:25984', | |
# 'http://adm:pass@localhost:35984' | |
] | |
DB_NAME = 'db' | |
def log(*args): | |
msg = " ".join(["%s" % a for a in args]) | |
sys.stderr.write(msg + '\n') | |
sys.stderr.flush() | |
def pick_server(urls): | |
if isinstance(urls, list): | |
return random.choice(urls) | |
return urls | |
def get_design_doc(key): | |
_id = "_design/%s" % uuid.uuid4().hex | |
return { | |
"_id": _id, | |
"views": { | |
"v1": { | |
"map": 'function(d){emit("%s",1);}' % key, | |
"reduce": '''function(keys, values, rereduce) { | |
if (rereduce) { | |
return sum(values); | |
} else { | |
return 2 * values.length; | |
} | |
} | |
''' | |
} | |
}, | |
"autoupdate": False, | |
"validate_doc_update": | |
''' | |
function(doc, olddoc, ctx) { | |
if (doc.bad) { | |
throw({forbidden:doc._id}); | |
} | |
} | |
''', | |
} | |
def wait(args): | |
sleep = 0 | |
if args.random_wait > 0.0: | |
sleep = random.randrange(args.random_wait * 1000) / 1000.0 | |
elif args.fixed_wait > 0.0: | |
sleep = args.fixed_wait | |
if sleep > 0: | |
time.sleep(sleep) | |
def execute_fun(args, pid, tid, i, db): | |
db.update([{'x':'y', '_id':uuid.uuid4().hex} for docnum in range(args.num_docs)]) | |
wait(args) | |
#if i % 10 == 0: | |
log(" *** process:", pid, "tid", tid, "i:", i) | |
for row in db.view('_design_docs'): | |
[_, ddoc_name] = row.key.split("/") | |
list(db.view(ddoc_name + '/v1')) | |
def thread_worker(args): | |
tid = args.tid | |
pid = os.getpid() | |
url = pick_server(args.urls) | |
srv = couchdb.Server(url) | |
srv.version() | |
dbname = "%s_%s_%s" % (args.dbname, pid, tid) | |
if dbname not in srv: | |
db = srv.create(dbname) | |
time.sleep(random.randrange(0,5)) | |
else: | |
db = srv[dbname] | |
key = '%s_%s' % (pid, tid) | |
db.update([get_design_doc(key) for docnum in range(args.design_docs)]) | |
tries = args.tries | |
for i in range(tries): | |
try: | |
execute_fun(args, pid, tid, i, db) | |
except Exception as e: | |
log(" >>> Worker exception caught", e) | |
traceback.print_exc(file=sys.stderr) | |
time.sleep(1) | |
continue | |
#raise | |
return tid | |
def set_worker_id(args, tid): | |
args = copy.deepcopy(args) | |
args.tid = tid | |
return args | |
def process_worker(args): | |
wcount = args.worker_count | |
pool = ThreadPool(wcount) | |
worker_args = [set_worker_id(args, i) for i in range(wcount)] | |
res = pool.map(thread_worker, worker_args) | |
def main(args): | |
if args.urls == []: | |
args.urls = DB_URLS | |
pool = Pool(processes=args.processes) | |
pool_args = [args for pnum in range(args.processes)] | |
pool.map(process_worker, pool_args) | |
def _args(): | |
description = "Do a few crud operations as a stampede" | |
p = argparse.ArgumentParser(description = description) | |
p.add_argument('-u', '--urls', action="append", default=[], help = "Server URL(s)") | |
p.add_argument('-d', '--dbname', default=DB_NAME, help = "DB name") | |
p.add_argument('-x', '--design_docs', type=int, default=10) | |
p.add_argument('-n', '--num_docs', type=int, default=2000) | |
p.add_argument('-w', '--worker-count', type=int, default=1) | |
p.add_argument('-t', '--tries', type=int, default=1) | |
p.add_argument('-r', '--random-wait', type=float, default=0) | |
p.add_argument('-f', '--fixed-wait', type=float, default=0) | |
p.add_argument('-p', '--processes', type=int, default=1) | |
return p.parse_args() | |
if __name__=='__main__': | |
args = _args() | |
main(_args()) | |
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