Github user zhichao-li commented on the pull request:

    https://github.com/apache/spark/pull/5508#issuecomment-92776100
  
    oops... Maybe it's not always true that avoid the use of `volatile` and 
`synchronized` like double check singleton(although it's a must in that case). 
Anyway, just post a PR here to see what's the opinion of your guys :)


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