Swift开放StatsD后上传数据的出现，出现退换货503的Bug

转载请注明出处：http://blog.csdn.net/cywosp/article/details/40781569

swift在版本号2.1.0之前假设各个服务的配置文件里打开下面配置后，且系统没有配置正确将会出现上传对象出错的情况

log_statsd_host = localhost

log_statsd_port = 8125

log_statsd_default_sample_rate = 1.0

log_statsd_sample_rate_factor = 1.0

log_statsd_metric_prefix =

详细错误log信息大概例如以下：

object-server ERROR __call__ error with PUT /sdc/2468/AUTH_8f9dbbadd64a43a0abb5e832c6ea766a/000008/013781 : #012Traceback (most recent call last):#012  File "/usr/lib/python2.6/site-packages/swift/obj/server.py", line 938, in __call__#012    res = method(req)#012  File "/usr/lib/python2.6/site-packages/swift/common/utils.py", line 1558, in wrapped#012    return func(*a, **kw)#012  File "/usr/lib/python2.6/site-packages/swift/common/utils.py", line 520, in _timing_stats#012    resp = func(ctrl, *args, **kwargs)#012  File "/usr/lib/python2.6/site-packages/swift/obj/server.py", line 712, in PUT#012    file.put(fd, metadata)#012  File "/usr/lib64/python2.6/contextlib.py", line 34, in __exit__#012    self.gen.throw(type, value, traceback)#012  File "/usr/lib/python2.6/site-packages/swift/obj/server.py", line 286, in mkstemp#012    yield fd#012  File "/usr/lib/python2.6/site-packages/swift/obj/server.py", line 680, in PUT#012    'PUT.' + device + '.timing', elapsed_time, upload_size)#012  File "/usr/lib/python2.6/site-packages/swift/common/utils.py", line 654, in wrapped#012    return func(self.logger.statsd_client, *a, **kw)#012  File "/usr/lib/python2.6/site-packages/swift/common/utils.py", line 506, in transfer_rate#012    sample_rate)#012  File "/usr/lib/python2.6/site-packages/swift/common/utils.py", line 496, in timing#012    return self._send(metric, timing_ms, 'ms', sample_rate)#012  File "/usr/lib/python2.6/site-packages/swift/common/utils.py", line 481, in _send#012    return sock.sendto('|'.join(parts), self._target)#012  File "/usr/lib/python2.6/site-packages/eventlet/greenio.py", line 371, in sendto#012    return self.fd.sendto(*args)#012error: [Errno 1] Operation not permitted (txn: tx8d76698250304466817aa99061637421)

依据log信息查到是在swift/common/utils.py文件的StatsdClient._send函数抛出了异常没有被捕捉导致的。该函数代码例如以下：

    def _send(self, m_name, m_value, m_type, sample_rate):

        if sample_rate is None:

            sample_rate = self._default_sample_rate

        sample_rate = sample_rate * self._sample_rate_factor

        parts = ['%s%s:%s' % (self._prefix, m_name, m_value), m_type]

        if sample_rate < 1:

            if self.random() < sample_rate:

                parts.append('@%s' % (sample_rate,))

            else:

                return

        # Ideally, we'd cache a sending socket in self, but that

        # results in a socket getting shared by multiple green threads.

        with closing(self._open_socket()) as sock:

                return sock.sendto('|'.join(parts), self._target)     #该函数调用抛出了异常

解决的方法：

    在return sock.sendto('|'.join(parts), self._target)中增加异常处理就可以。详细代码可參考官方最新代码

同一时候系统的/var/log/messages日志中出现大量的例如以下信息：

proxy-access Error sending UDP message to ('127.0.0.1', 8125): [Errno 1] Operation not permitted

proxy-access Error sending UDP message to ('127.0.0.1', 8125): [Errno 1] Operation not permitted

kernel: __ratelimit: 89 callbacks suppressed

kernel: nf_conntrack: table full, dropping packet.

kernel: nf_conntrack: table full, dropping packet.

kernel: nf_conntrack: table full, dropping packet.

解决的方法：

依据上面的信息。得知8125port是StatsD服务port，因此是StatsD的client出了问题。

同一时候内核报出了丢包错误。主要是因为server防火墙开启了过滤机制导致的（net.ipv4.netfilter.ip_conntrack_max太小）。在此将防火墙关闭就可以(service iptables stop)

參考：

[1] https://bugs.launchpad.net/swift/+bug/1183152

[2] http://www.cyberciti.biz/faq/ip_conntrack-table-ful-dropping-packet-error/

[3] http://stackoverflow.com/questions/6240951/sendto-operation-not-permitted-netsnmp

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