Victsm commented on a change in pull request #29855:
URL: https://github.com/apache/spark/pull/29855#discussion_r495124759
##########
File path:
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalBlockHandler.java
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@@ -373,6 +427,54 @@ public ManagedBuffer next() {
}
}
+ /**
+ * Dummy implementation of merged shuffle file manager. Suitable for when
push-based shuffle
+ * is not enabled.
+ */
+ private static class NoOpMergedShuffleFileManager implements
MergedShuffleFileManager {
+
+ @Override
+ public StreamCallbackWithID receiveBlockDataAsStream(PushBlockStream msg) {
+ throw new UnsupportedOperationException("Cannot handle shuffle block
merge");
+ }
+
+ @Override
+ public MergeStatuses finalizeShuffleMerge(FinalizeShuffleMerge msg) throws
IOException {
+ throw new UnsupportedOperationException("Cannot handle shuffle block
merge");
+ }
+
+ @Override
+ public void registerApplication(String appId, String user) {
Review comment:
The `user` is the ID for the user running the Spark app. The `appId` and
`user` together indicates the unique local dir paths where merged shuffle files
for executors on a given node are stored.
Is your concern that this API might be too YARN specific?
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