Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3661#discussion_r21931523
  
    --- Diff: 
streaming/src/main/scala/org/apache/spark/streaming/ContextWaiter.scala ---
    @@ -17,30 +17,74 @@
     
     package org.apache.spark.streaming
     
    +import java.util.concurrent.{TimeoutException, TimeUnit}
    +import java.util.concurrent.locks.ReentrantLock
    +import javax.annotation.concurrent.GuardedBy
    +
     private[streaming] class ContextWaiter {
    +
    +  private val lock = new ReentrantLock()
    +  private val condition = lock.newCondition()
    +
    +  @GuardedBy("lock")
    --- End diff --
    
    In general, I'm a fan of the FindBugs annotations.  I've had trouble 
getting the various analysis tools to work well with them in Scala, though.  +1 
to this commenting convention, though; this is very helpful.


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