cloud-fan commented on a change in pull request #23590: [SPARK-26665][Core]Fix 
a bug that BlockTransferService.fetchBlockSync may hang forever
URL: https://github.com/apache/spark/pull/23590#discussion_r249371205
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/network/BlockTransferService.scala
 ##########
 @@ -107,10 +107,14 @@ abstract class BlockTransferService extends 
ShuffleClient with Closeable with Lo
             case e: EncryptedManagedBuffer =>
               result.success(e)
             case _ =>
-              val ret = ByteBuffer.allocate(data.size.toInt)
-              ret.put(data.nioByteBuffer())
-              ret.flip()
-              result.success(new NioManagedBuffer(ret))
+              try {
+                val ret = ByteBuffer.allocate(data.size.toInt)
+                ret.put(data.nioByteBuffer())
+                ret.flip()
+                result.success(new NioManagedBuffer(ret))
+              } catch {
+                case e: Throwable => result.failure(e)
 
 Review comment:
   we need to get the `e`,  I think the `catch` is necessary here.

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