title: influxDB, connection error after some write opreation
body: <p>I try to use influxDB to save some monitor data. I started influxDB with default configuration and used python to write some test data through HTTP API in my own mac, everything going well in the beginning. But I encountered a ConnectionError every time after I wrote some data. My test code is</p>
  
  <pre><code>for event_id in xrange(0, 100000):
      requests.post("http://127.0.0.1:8086/write?db=mydb", data="test_a,event={0} value=100 1538841600000000000".format(event_id))
  </code></pre>
  
  <p>After about 16300 executions, an error will be reported.</p>
  
  <pre><code>HTTPConnectionPool(host='127.0.0.1', port=8086): Max retries exceeded with url: /write?db=mydb (Caused by NewConnectionError("&lt;urllib3.connection.HTTPConnection object at 0x110a5fb10&gt;: Failed to establish a new connection: [Errno 49] Can't assign requested address",)
  </code></pre>
  
  <p>And then, I should wait about 2 seconds before I write new data.</p>
  
  <p>My OS is MacOS 10.14, and all data is saved in an HDD hard disk.</p>
  
  <p>influxDB version is vv1.6.4 (git: master c75cdfdfa6f71a08473fefcec71f6cbcbdef1ff4)</p>
  
  <p>Is influxDB doing some tidying up?</p>