龍卷風“錯誤：[Errno 24]打開文件太多”錯誤

Question

我和Tornado一起工作了很多，但這是我第一次遇到這種錯誤。 我一直在研究一個非常基本的URL縮短器。 URL由不同的應用程序放入數據庫，這只是從MongoDB商店讀取URL並重定向客戶端。 在我編寫了基本代碼之后，我設置了一個簡單的'Siege'測試，在運行圍攻大約30秒后（使用siege -c 64 -t 5m -r 1 http://example.com/MKy對抗4個應用程序線程）我開始得到500個響應。 查看錯誤日志，我看到了這個;

ERROR:root:500 GET /MKy (127.0.0.1) 2.05ms
ERROR:root:Exception in I/O handler for fd 4
Traceback (most recent call last):
  File "/opt/python2.7/lib/python2.7/site-packages/tornado-2.1-py2.7.egg/tornado/ioloop.py", line 309, in start
  File "/opt/python2.7/lib/python2.7/site-packages/tornado-2.1-py2.7.egg/tornado/netutil.py", line 314, in accept_handler
  File "/opt/python2.7/lib/python2.7/socket.py", line 200, in accept
error: [Errno 24] Too many open files
ERROR:root:Uncaught exception GET /MKy (127.0.0.1)
HTTPRequest(protocol='http', host='shortener', method='GET', uri='/MKy', version='HTTP/1.0', remote_ip='127.0.0.1', body='', headers={'Host': 'shortener', 'Accept-Encoding': 'gzip', 'X-Real-Ip': '94.23.155.32', 'X-Forwarded-For': '94.23.155.32', 'Connection': 'close', 'Accept': '*/*', 'User-Agent': 'JoeDog/1.00 [en] (X11; I; Siege 2.66)'})
Traceback (most recent call last):
  File "/opt/python2.7/lib/python2.7/site-packages/tornado-2.1-py2.7.egg/tornado/web.py", line 1040, in wrapper
  File "main.py", line 58, in get
  File "main.py", line 21, in dbmongo
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/connection.py", line 349, in __init__
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/connection.py", line 510, in __find_master
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/connection.py", line 516, in __try_node
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/database.py", line 301, in command
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/collection.py", line 441, in find_one
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/cursor.py", line 539, in loop
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/cursor.py", line 560, in _refresh
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/cursor.py", line 620, in __send_message
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/connection.py", line 735, in _send_message_with_response
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/connection.py", line 591, in __stream
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/connection.py", line 200, in get_stream
  File "/opt/python2.7/lib/python2.7/site-packages/apymongo-0.0.1-py2.7-linux-x86_64.egg/apymongo/connection.py", line 559, in __connect
AutoReconnect: could not connect to [('127.0.0.1', 27017)]

重要的（我猜）;

錯誤：[Errno 24]打開的文件太多

代碼; （這很簡單）

import tornado.ioloop
import tornado.web
import tornado.escape
import apymongo
import time
import sys

#Useful stuff (Connect to Mongo)
class setup(tornado.web.RequestHandler):
    def dbmongo(self):
        if not hasattr(self, '_dbmongo'):
            self._dbmongo = apymongo.Connection("127.0.0.1", 27017)
        return self._dbmongo


#Basic method to lookup URLs from Mongo and redirect accordingly
class expand(setup):
    @tornado.web.asynchronous
    def get(self, url):
        self.mongo = self.dbmongo()

        #Lookup the URL
        cursor = self.mongo.rmgshortlinks.links.find_one({'short':url}, self.direct)

    def direct(self, response):
        if response == None:
            self.send_error(404)
            self.finish()
            return

        link = tornado.escape.url_unescape(response['long'])

        #Bounce the client
        self.write("<!DOCTYPE html><html><head><meta charset=\"UTF-8\" /><meta http-equiv=\"refresh\" content=\"0;URL="+link+"\"</head><body><a href=\""+link+"\">Click Here</a></body></html>")
        self.finish();


#Define the URL routes
application = tornado.web.Application([
    (r"/([a-zA-Z0-9]+)", expand)
])

#Start the server
if __name__ == "__main__":
    listening_port = int(sys.argv[1])

    if listening_port > 0:
        application.listen(listening_port)
        tornado.ioloop.IOLoop.instance().start()
    else:
        sys.stderr.write("No port specified!")

我正在使用的開發服務器有8個內核和64GB內存，運行RedHat Enterprise Linux 5和Python 2.6。 我之前從未遇到過Tornado / Async Mongo應用程序的這些問題。

可能有用的信息;

[root@puma ~]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 31374
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 31374
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

（打開文件只設置為1024，但我認為這已經足夠了）

Tornado / Apymongo沒有正確關閉連接嗎？ 應用程序位於NGINX后面但使用HTTP連接，Apymongo應該通過TCP連接，但可能使用套接字。 即便如此，它應該是共享/池連接不應該嗎？

編輯

按照建議，將應用程序移動到我們的一個測試服務器上，最大打開文件限制為61440，在圍攻中運行約30秒后出現相同的錯誤。

Answer 1

很簡單，RequestHandler對象是為每個請求實例化的。 這意味着您要保存的緩存對象位於RequestHandler（例如，expand）對象上。

如果要向dbmongo（...）函數添加一個簡單的“print'CREATED！'”，您會看到它是在每個GET請求上創建的。

您需要做的是將處理程序附加到類對象，或根據需要附加“全局”，但最好的情況是將它放在Tornado Application對象上。

簡單：

class setup(tornado.web.RequestHandler):
    @classmethod
    def dbmongo(cls):
        if not hasattr(cls, '_dbmongo'):
            cls._dbmongo = apymongo.Connection("127.0.0.1", 27017)
        return cls._dbmongo

第二種方法就是在文件中使其成為全局：

dbmongo_connection = None
def dbmongo():
    if not dbmongo_connection:
        dbmongo_connection = apymongo.Connection("127.0.0.1", 27017)
    return dbmongo_connection

這兩個都有同樣的問題，如果你有很多想要使用數據庫連接的類，那么分享它就更難了。 由於DB是一個共享實體，您可能需要一個用於整個應用程序的實體。

class MongoMixin(object):
    def mongodb(self):
        if not hasattr(self.application, 'mongodb'):
            self.application.mongodb = apymongo.Connection(self.application.settings.get("mongohost", "127.0.0.1"), 27017)
        return self.application.mongodb

class expand(tornado.web.RequestHandler, MongoMixin):
    def get(self):
       db = self.mongodb()

龍卷風“錯誤：[Errno 24]打開文件太多”錯誤

問題描述

編輯

1 個解決方案

解決方案1
4 已采納 2011-11-21 21:29:36

龍卷風“錯誤：[Errno 24]打開文件太多”錯誤

問題描述

編輯

1 個解決方案

解決方案1 4 已采納 2011-11-21 21:29:36

解決方案1
4 已采納 2011-11-21 21:29:36