HADOOP-12052 IPC client downgrades all exception types to IOE, breaks callers trying to use them. (Brahma Reddy Battula via stevel)

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -834,6 +834,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-11924. Tolerate JDK-8047340-related exceptions in
     Shell#isSetSidAvailable preventing class init. (Tsuyoshi Ozawa via gera)
 
+    HADOOP-12052 IPC client downgrades all exception types to IOE, breaks
+    callers trying to use them. (Brahma Reddy Battula via stevel)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java

@@ -1484,7 +1484,13 @@ public class Client {
           }
         });
       } catch (ExecutionException e) {
-        throw new IOException(e);
+        Throwable cause = e.getCause();
+        // the underlying exception should normally be IOException
+        if (cause instanceof IOException) {
+          throw (IOException) cause;
+        } else {
+          throw new IOException(cause);
+        }
       }
       if (connection.addCall(call)) {
         break;