Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18231#discussion_r122225726
--- Diff:
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleBlockHandler.java
---
@@ -209,4 +190,51 @@ private ShuffleMetrics() {
}
}
+ private class ManagedBufferIterator implements Iterator<ManagedBuffer> {
+
+ private int index = 0;
+ private final String appId;
+ private final String execId;
+ private final int shuffleId;
+ // An array containing mapId and reduceId pairs.
+ private final 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]);
+ }
+ if (!blockId0Parts[0].equals("shuffle")) {
+ throw new IllegalArgumentException("Expected shuffle block id,
got: " + blockIds[0]);
+ }
+ this.shuffleId = Integer.parseInt(blockId0Parts[1]);
+ mapIdAndReduceIds = new int[2 * blockIds.length];
+ for (int i = 0; i < blockIds.length; i++) {
+ String[] blockIdParts = blockIds[i].split("_");
+ if (Integer.parseInt(blockIdParts[1]) != shuffleId) {
--- End diff --
blockIdParts[1].toInt != shuffleId ?
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