title: What does mean state 1 in db.config.locks collection
body: <p>In my config.locks collection after unsucessfull migration to 2.4 version I have document like this: </p>
  
  <pre><code>{
  "_id" : "configUpgrade",
  "process" : "mongo10:27017:1369289803:1804289383",
  "state" : 1,
  "ts" : ObjectId("519db44b8436a4e1aa17b0a5"),
  "when" : ISODate("2013-05-23T06:16:43.075Z"),
  "who" : "mongo10:27017:1369289803:1804289383:mongosMain:846930886",
  "why" : "upgrading config database to new format v4"
  }
  </code></pre>
  
  <p>What does it mean state 1? I know that valid values for 'state' are 0,1 and 2. What each of them means?</p>