From 4feed9b2dbff7bc52871cde7e1ff31b862e4fe9a Mon Sep 17 00:00:00 2001
From: Steve Loughran <stevel@apache.org>
Date: Fri, 15 Apr 2016 17:43:38 +0100
Subject: [PATCH] HADOOP-13026 Should not wrap IOExceptions into a
 AuthenticationException in KerberosAuthenticator. Xuan Gong via stevel

---
 .../authentication/client/KerberosAuthenticator.java        | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/client/KerberosAuthenticator.java b/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/client/KerberosAuthenticator.java
index 0f046ae9f3e..a69ee46bbae 100644
--- a/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/client/KerberosAuthenticator.java
+++ b/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/client/KerberosAuthenticator.java
@@ -327,7 +327,11 @@ public class KerberosAuthenticator implements Authenticator {
         }
       });
     } catch (PrivilegedActionException ex) {
-      throw new AuthenticationException(ex.getException());
+      if (ex.getException() instanceof IOException) {
+        throw (IOException) ex.getException();
+      } else {
+        throw new AuthenticationException(ex.getException());
+      }
     } catch (LoginException ex) {
       throw new AuthenticationException(ex);
     }