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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