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

    https://github.com/apache/spark/pull/20555#discussion_r168007713
  
    --- Diff: core/src/main/java/org/apache/spark/io/ReadAheadInputStream.java 
---
    @@ -230,24 +227,32 @@ private void signalAsyncReadComplete() {
     
       private void waitForAsyncReadComplete() throws IOException {
         stateChangeLock.lock();
    +    isWaiting.set(true);
         try {
    -      while (readInProgress) {
    +      if (readInProgress) {
    --- End diff --
    
    The while loop here is to handle [spurious 
wakeup](https://en.wikipedia.org/wiki/Spurious_wakeup).


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