[GitHub] [spark] Ngone51 commented on a change in pull request #27419: [WIP][SPARK-30694][SHUFFLE]If exception occured while fetching blocks by ExternalBlockClient, fail early when External Shuffle Service is not alive

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Ngone51 commented on a change in pull request #27419: [WIP][SPARK-30694][SHUFFLE]If exception occured while fetching blocks by ExternalBlockClient, fail early when External Shuffle Service is not alive
URL: https://github.com/apache/spark/pull/27419#discussion_r378611424
 
 

 ##########
 File path: common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalBlockStoreClient.java
 ##########
 @@ -105,7 +109,23 @@ public void fetchBlocks(
           (blockIds1, listener1) -> {
             // Unless this client is closed.
             if (clientFactory != null) {
-              TransportClient client = clientFactory.createClient(host, port);
+              TransportClient client = null;
+              try {
+                client = clientFactory.createClient(host, port);
+              } catch (InterruptedException e) {
+                throw e;
+              } catch (IOException e) {
+                if (!isHostReachable(host, 3000) || !isHostPortConnectable(host, port)) {
 
 Review comment:
   It's also possible that `Host` is unreachable or connectable when network is unstable, right?

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