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

    https://github.com/apache/spark/pull/18231#discussion_r121237684
  
    --- Diff: 
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleBlockHandler.java
 ---
    @@ -209,4 +190,52 @@ private ShuffleMetrics() {
         }
       }
     
    +  private class ManagedBufferIterator implements Iterator<ManagedBuffer> {
    +
    +    private int index = 0;
    +    private String appId;
    +    private String execId;
    +    private String shuffleId;
    +    // An array containing mapId and reduceId pairs.
    +    private int[][] mapIdAndReduceIds;
    +
    +    ManagedBufferIterator(String appId, String execId, String[] blockIds) {
    +      this.appId = appId;
    +      this.execId = execId;
    +      String[] blockId0Parts = blockIds[0].split("_");
    +      if (blockId0Parts.length < 4) {
    +        throw new IllegalArgumentException("Unexpected block id format: " 
+ blockIds[0]);
    +      } else if (!blockId0Parts[0].equals("shuffle")) {
    --- End diff --
    
    I think Sean means that since you're throwing in the previous block, `else` 
is redundant.


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