title: mongoimport stuck at same point while importing a JSON file
body: <pre><code>OS: ubuntu 14.04 LTS
  Mongo version: rs0:PRIMARY&gt; db.version()
      3.0.7
  Storage engine: wiredTiger.
  </code></pre>
  
  <p>Importing a JSON file (13GB, 1 JSON doc per line) via this command:</p>
  
  <pre><code>$ mongoimport --db InfDB --collection SFTest --file InfMapRed.json
  </code></pre>
  
  <p>This command used to work fine in 2.6 with the prior storage engine but now does not progress beyond 0.2%. The program keeps printing the line below over and over. The collection shows 1000 records via .count().</p>
  
  <pre><code>    2015-10-24T06:11:41.799+0000    connected to: localhost
      2015-10-24T06:11:44.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:11:47.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:11:50.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:11:53.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:11:56.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:11:59.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:02.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:05.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:08.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:11.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:14.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:17.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:20.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
      2015-10-24T06:12:23.788+0000    [........................] InfDB.SFTest       20.5 MB/13.0 GB (0.2%)
  ....
  </code></pre>
  
  <p>Wrote a simple python script to read the file and insert the docs line wise and that works fine.</p>