cloud-fan commented on a change in pull request #31643:
URL: https://github.com/apache/spark/pull/31643#discussion_r585359529
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File path:
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/OneForOneBlockFetcher.java
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@@ -106,17 +107,17 @@ private boolean isShuffleBlocks(String[] blockIds) {
}
/**
- * Analyze the pass in blockIds and create FetchShuffleBlocks message.
- * The blockIds has been sorted by mapId and reduceId. It's produced in
- * org.apache.spark.MapOutputTracker.convertMapStatuses.
+ * Create FetchShuffleBlocks message and rebuild internal blockIds by
+ * analyzing the pass in blockIds.
*/
- private FetchShuffleBlocks createFetchShuffleBlocksMsg(
+ private FetchShuffleBlocks createFetchShuffleBlocksMsgAndBuildBlockIds(
String appId, String execId, String[] blockIds) {
String[] firstBlock = splitBlockId(blockIds[0]);
int shuffleId = Integer.parseInt(firstBlock[1]);
boolean batchFetchEnabled = firstBlock.length == 5;
- HashMap<Long, ArrayList<Integer>> mapIdToReduceIds = new HashMap<>();
+ LinkedHashMap<Long, ArrayList<Integer>> mapIdToReduceIds = new
LinkedHashMap<>();
+ LinkedHashMap<Long, ArrayList<String>> mapIdToBlockIds = new
LinkedHashMap<>();
Review comment:
Can we use a single map? we can create a `BlocksInfo` class here
```
class BlocksInfo {
ArrayList<Integer> reduceIds;
ArrayList<String> blockIds;
}
LinkedHashMap<Long, BlocksInfo> mapIdToBlocksInfo = new LinkedHashMap<>();
```
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